Introduce XmlEnvironment

smack-core/src/main/java/org/jivesoftware/smack/compress/packet/Compress.java

@@ -45,7 +45,7 @@ public class Compress implements Nonza {
     }
 
     @Override
-    public XmlStringBuilder toXML(String enclosingNamespace) {
+    public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder xml = new XmlStringBuilder(this, enclosingNamespace);
         xml.rightAngleBracket();
         xml.element("method", method);
@@ -77,7 +77,7 @@ public class Compress implements Nonza {
         }
 
         @Override
-        public XmlStringBuilder toXML(String enclosingNamespace) {
+        public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             XmlStringBuilder xml = new XmlStringBuilder(this);
             xml.rightAngleBracket();
             for (String method : methods) {

smack-core/src/main/java/org/jivesoftware/smack/compress/packet/Compressed.java

@@ -39,7 +39,7 @@ public final class Compressed implements Nonza {
     }
 
     @Override
-    public String toXML(String enclosingNamespace) {
+    public String toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         return '<' + ELEMENT + " xmlns='" + NAMESPACE + "'/>";
     }
 }

smack-core/src/main/java/org/jivesoftware/smack/compress/packet/Failure.java

@@ -76,7 +76,7 @@ public class Failure implements Nonza {
     }
 
     @Override
-    public XmlStringBuilder toXML(String enclosingNamespace) {
+    public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder xml = new XmlStringBuilder(this, enclosingNamespace);
         xml.rightAngleBracket();
 

smack-core/src/main/java/org/jivesoftware/smack/debugger/AbstractDebugger.java

@@ -161,7 +161,7 @@ public abstract class AbstractDebugger extends SmackDebugger {
     @Override
     public void onIncomingStreamElement(TopLevelStreamElement streamElement) {
         if (printInterpreted) {
-            log("RCV PKT (" + connection.getConnectionCounter() + "): " + streamElement.toXML(null));
+            log("RCV PKT (" + connection.getConnectionCounter() + "): " + streamElement.toXML());
         }
     }
 

smack-core/src/main/java/org/jivesoftware/smack/packet/AbstractError.java

@@ -114,7 +114,7 @@ public class AbstractError {
             xml.closeElement("text");
         }
         for (ExtensionElement packetExtension : extensions) {
-            xml.append(packetExtension.toXML(null));
+            xml.append(packetExtension.toXML());
         }
     }
 

smack-core/src/main/java/org/jivesoftware/smack/packet/AbstractTextElement.java

@@ -37,7 +37,7 @@ public abstract class AbstractTextElement implements ExtensionElement {
     }
 
     @Override
-    public XmlStringBuilder toXML(String enclosingNamespace) {
+    public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder xml = new XmlStringBuilder(this);
         xml.optXmlLangAttribute(lang);
         xml.rightAngleBracket();

smack-core/src/main/java/org/jivesoftware/smack/packet/Bind.java

@@ -89,7 +89,7 @@ public final class Bind extends IQ {
         }
 
         @Override
-        public String toXML(String enclosingNamespace) {
+        public String toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             return '<' + ELEMENT + " xmlns='" + NAMESPACE + "'/>";
         }
 

smack-core/src/main/java/org/jivesoftware/smack/packet/DefaultExtensionElement.java

@@ -86,7 +86,7 @@ public class DefaultExtensionElement implements ExtensionElement {
     }
 
     @Override
-    public CharSequence toXML(String enclosingNamespace) {
+    public CharSequence toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder buf = new XmlStringBuilder();
         buf.halfOpenElement(elementName).xmlnsAttribute(namespace).rightAngleBracket();
         for (String name : getNames()) {

smack-core/src/main/java/org/jivesoftware/smack/packet/Element.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright © 2014-2018 Florian Schmaus
+ * Copyright © 2014-2019 Florian Schmaus
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -23,7 +23,7 @@ package org.jivesoftware.smack.packet;
  */
 public interface Element {
 
-    // TODO: Add a toXML() non-parameter default method once Smack supports Java 8.
+    CharSequence toXML(XmlEnvironment xmlEnvironment);
 
     /**
      * Returns the XML representation of this Element. This method takes an optional argument for the enclosing
@@ -32,5 +32,12 @@ public interface Element {
      * @param enclosingNamespace the enclosing namespace or {@code null}.
      * @return the stanza extension as XML.
      */
-    CharSequence toXML(String enclosingNamespace);
+    default CharSequence toXML(String enclosingNamespace) {
+        XmlEnvironment xmlEnvironment = new XmlEnvironment(enclosingNamespace);
+        return toXML(xmlEnvironment);
+    }
+
+    default CharSequence toXML() {
+        return toXML(XmlEnvironment.EMPTY);
+    }
 }

smack-core/src/main/java/org/jivesoftware/smack/packet/IQ.java

@@ -126,10 +126,10 @@ public abstract class IQ extends Stanza {
     }
 
     @Override
-    public final XmlStringBuilder toXML(String enclosingNamespace) {
+    public final XmlStringBuilder toXML(XmlEnvironment enclosingXmlEnvironment) {
-        XmlStringBuilder buf = new XmlStringBuilder(enclosingNamespace);
+        XmlStringBuilder buf = new XmlStringBuilder(enclosingXmlEnvironment);
         buf.halfOpenElement(IQ_ELEMENT);
-        addCommonAttributes(buf, enclosingNamespace);
+        addCommonAttributes(buf, enclosingXmlEnvironment);
         if (type == null) {
             buf.attribute("type", "get");
         }
@@ -137,7 +137,7 @@ public abstract class IQ extends Stanza {
             buf.attribute("type", type.toString());
         }
         buf.rightAngleBracket();
-        buf.append(getChildElementXML(enclosingNamespace));
+        buf.append(getChildElementXML(enclosingXmlEnvironment));
         buf.closeElement(IQ_ELEMENT);
         return buf;
     }
@@ -156,15 +156,15 @@ public abstract class IQ extends Stanza {
      * Returns the sub-element XML section of the IQ packet, or the empty String if there
      * isn't one.
      *
-     * @param enclosingNamespace the enclosing XML namespace.
+     * @param enclosingXmlEnvironment the enclosing XML namespace.
      * @return the child element section of the IQ XML.
      * @since 4.3.0
      */
-    public final XmlStringBuilder getChildElementXML(String enclosingNamespace) {
+    public final XmlStringBuilder getChildElementXML(XmlEnvironment enclosingXmlEnvironment) {
         XmlStringBuilder xml = new XmlStringBuilder();
         if (type == Type.error) {
             // Add the error sub-packet, if there is one.
-            appendErrorIfExists(xml, enclosingNamespace);
+            appendErrorIfExists(xml, enclosingXmlEnvironment);
         }
         else if (childElementName != null) {
             // Add the query section if there is one.
@@ -240,7 +240,7 @@ public abstract class IQ extends Stanza {
     protected final void initializeAsResultFor(IQ request) {
         if (!(request.getType() == Type.get || request.getType() == Type.set)) {
             throw new IllegalArgumentException(
-                    "IQ must be of type 'set' or 'get'. Original IQ: " + request.toXML(null));
+                    "IQ must be of type 'set' or 'get'. Original IQ: " + request.toXML());
         }
         setStanzaId(request.getStanzaId());
         setFrom(request.getTo());
@@ -289,7 +289,7 @@ public abstract class IQ extends Stanza {
     public static ErrorIQ createErrorResponse(final IQ request, final StanzaError.Builder error) {
         if (!(request.getType() == Type.get || request.getType() == Type.set)) {
             throw new IllegalArgumentException(
-                    "IQ must be of type 'set' or 'get'. Original IQ: " + request.toXML(null));
+                    "IQ must be of type 'set' or 'get'. Original IQ: " + request.toXML());
         }
         final ErrorIQ result = new ErrorIQ(error);
         result.setStanzaId(request.getStanzaId());
@@ -381,7 +381,6 @@ public abstract class IQ extends Stanza {
         }
 
         private IQChildElementXmlStringBuilder(String element, String namespace) {
-            super("");
             prelude(element, namespace);
             this.element = element;
         }

smack-core/src/main/java/org/jivesoftware/smack/packet/Mechanisms.java

@@ -53,7 +53,7 @@ public class Mechanisms implements ExtensionElement {
     }
 
     @Override
-    public XmlStringBuilder toXML(String enclosingNamespace) {
+    public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder xml = new XmlStringBuilder(this);
         xml.rightAngleBracket();
         for (String mechanism : mechanisms) {

smack-core/src/main/java/org/jivesoftware/smack/packet/Message.java

@@ -479,10 +479,10 @@ public final class Message extends Stanza implements TypedCloneable<Message> {
     }
 
     @Override
-    public XmlStringBuilder toXML(String enclosingNamespace) {
+    public XmlStringBuilder toXML(XmlEnvironment enclosingXmlEnvironment) {
-        XmlStringBuilder buf = new XmlStringBuilder(enclosingNamespace);
+        XmlStringBuilder buf = new XmlStringBuilder(enclosingXmlEnvironment);
         buf.halfOpenElement(ELEMENT);
-        enclosingNamespace = addCommonAttributes(buf, enclosingNamespace);
+        enclosingXmlEnvironment = addCommonAttributes(buf, enclosingXmlEnvironment);
         buf.optAttribute("type", type);
         buf.rightAngleBracket();
 
@@ -496,16 +496,16 @@ public final class Message extends Stanza implements TypedCloneable<Message> {
             // Skip the default language
             if (subject.equals(defaultSubject))
                 continue;
-            buf.append(subject.toXML(null));
+            buf.append(subject.toXML());
         }
         buf.optElement("thread", thread);
         // Append the error subpacket if the message type is an error.
         if (type == Type.error) {
-            appendErrorIfExists(buf, enclosingNamespace);
+            appendErrorIfExists(buf, enclosingXmlEnvironment);
         }
 
         // Add extension elements, if any are defined.
-        buf.append(getExtensions(), enclosingNamespace);
+        buf.append(getExtensions(), enclosingXmlEnvironment);
 
         buf.closeElement(ELEMENT);
         return buf;
@@ -600,7 +600,7 @@ public final class Message extends Stanza implements TypedCloneable<Message> {
         }
 
         @Override
-        public XmlStringBuilder toXML(String enclosingNamespace) {
+        public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             XmlStringBuilder xml = new XmlStringBuilder();
             xml.halfOpenElement(getElementName()).optXmlLangAttribute(getLanguage()).rightAngleBracket();
             xml.escape(subject);
@@ -708,8 +708,8 @@ public final class Message extends Stanza implements TypedCloneable<Message> {
         }
 
         @Override
-        public XmlStringBuilder toXML(String enclosingNamespace) {
+        public XmlStringBuilder toXML(XmlEnvironment enclosingXmlEnvironment) {
-            XmlStringBuilder xml = new XmlStringBuilder(this, enclosingNamespace);
+            XmlStringBuilder xml = new XmlStringBuilder(this, enclosingXmlEnvironment);
             xml.optXmlLangAttribute(getLanguage()).rightAngleBracket();
             xml.escape(message);
             xml.closeElement(getElementName());

smack-core/src/main/java/org/jivesoftware/smack/packet/Presence.java

@@ -272,7 +272,7 @@ public final class Presence extends Stanza implements TypedCloneable<Presence> {
     }
 
     @Override
-    public XmlStringBuilder toXML(String enclosingNamespace) {
+    public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder buf = new XmlStringBuilder(enclosingNamespace);
         buf.halfOpenElement(ELEMENT);
         addCommonAttributes(buf, enclosingNamespace);

smack-core/src/main/java/org/jivesoftware/smack/packet/Session.java

@@ -67,7 +67,7 @@ public class Session extends SimpleIQ {
         }
 
         @Override
-        public XmlStringBuilder toXML(String enclosingNamespace) {
+        public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             XmlStringBuilder xml = new XmlStringBuilder(this);
             if (optional) {
                 xml.rightAngleBracket();

smack-core/src/main/java/org/jivesoftware/smack/packet/StandardExtensionElement.java

@@ -132,7 +132,7 @@ public final class StandardExtensionElement implements ExtensionElement {
     }
 
     @Override
-    public XmlStringBuilder toXML(String enclosingNamespace) {
+    public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         if (xmlCache != null) {
             return xmlCache;
         }

smack-core/src/main/java/org/jivesoftware/smack/packet/Stanza.java

@@ -503,25 +503,30 @@ public abstract class Stanza implements TopLevelStreamElement {
      * Add to, from, id and 'xml:lang' attributes
      *
      * @param xml the {@link XmlStringBuilder}.
-     * @param enclosingNamespace the enclosing XML namespace.
+     * @param enclosingXmlEnvironment the enclosing XML namespace.
-     * @return the set namespace for this stanza.
+     * @return the XML environment for this stanza.
      */
-    protected String addCommonAttributes(XmlStringBuilder xml, String enclosingNamespace) {
+    protected XmlEnvironment addCommonAttributes(XmlStringBuilder xml, XmlEnvironment enclosingXmlEnvironment) {
-        String namespace;
+        String language = getLanguage();
-        if (enclosingNamespace == null || !enclosingNamespace.equals(StreamOpen.CLIENT_NAMESPACE)
+        String namespace = StreamOpen.CLIENT_NAMESPACE;
-                || !enclosingNamespace.equals(StreamOpen.SERVER_NAMESPACE)) {
+        if (enclosingXmlEnvironment != null) {
-            namespace = StreamOpen.CLIENT_NAMESPACE;
+            String effectiveEnclosingNamespace = enclosingXmlEnvironment.getEffectiveNamespaceOrUse(namespace);
-        } else {
+            switch (effectiveEnclosingNamespace) {
-            namespace = enclosingNamespace;
+            case StreamOpen.CLIENT_NAMESPACE:
+            case StreamOpen.SERVER_NAMESPACE:
+                break;
+            default:
+                namespace = effectiveEnclosingNamespace;
+            }
         }
 
         xml.xmlnsAttribute(namespace);
         xml.optAttribute("to", getTo());
         xml.optAttribute("from", getFrom());
         xml.optAttribute("id", getStanzaId());
-        xml.xmllangAttribute(getLanguage());
+        xml.xmllangAttribute(language);
 
-        return namespace;
+        return new XmlEnvironment(namespace, language);
     }
 
     protected void logCommonAttributes(StringBuilder sb) {
@@ -541,10 +546,10 @@ public abstract class Stanza implements TopLevelStreamElement {
      *
      * @param xml the XmlStringBuilder to append the error to.
      */
-    protected void appendErrorIfExists(XmlStringBuilder xml, String enclosingNamespace) {
+    protected void appendErrorIfExists(XmlStringBuilder xml, XmlEnvironment enclosingXmlEnvironment) {
         StanzaError error = getError();
         if (error != null) {
-            xml.append(error.toXML(enclosingNamespace));
+            xml.append(error.toXML(enclosingXmlEnvironment));
         }
     }
 }

smack-core/src/main/java/org/jivesoftware/smack/packet/StanzaError.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright 2003-2007 Jive Software, 2015-2018 Florian Schmaus
+ * Copyright 2003-2007 Jive Software, 2015-2019 Florian Schmaus
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -214,17 +214,8 @@ public class StanzaError extends AbstractError implements ExtensionElement {
         return StreamOpen.CLIENT_NAMESPACE;
     }
 
-    /**
-     * Returns the error as XML.
-     *
-     * @return the error as XML.
-     */
-    public XmlStringBuilder toXML() {
-        return toXML(null);
-    }
-
     @Override
-    public XmlStringBuilder toXML(String enclosingNamespace) {
+    public XmlStringBuilder toXML(XmlEnvironment enclosingNamespace) {
         XmlStringBuilder xml = new XmlStringBuilder(this, enclosingNamespace);
         xml.attribute("type", type.toString());
         xml.optAttribute("by", errorGenerator);

smack-core/src/main/java/org/jivesoftware/smack/packet/StartTls.java

@@ -50,7 +50,7 @@ public class StartTls implements Nonza {
     }
 
     @Override
-    public XmlStringBuilder toXML(String enclosingNamespace) {
+    public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder xml = new XmlStringBuilder(this, enclosingNamespace);
         xml.rightAngleBracket();
         xml.condEmptyElement(required, "required");

smack-core/src/main/java/org/jivesoftware/smack/packet/StreamClose.java

@@ -24,7 +24,7 @@ public final class StreamClose implements Nonza {
     }
 
     @Override
-    public String toXML(String enclosingNamespace) {
+    public String toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         return "</" + getElementName() + '>';
     }
 

smack-core/src/main/java/org/jivesoftware/smack/packet/StreamError.java

@@ -136,11 +136,11 @@ public class StreamError extends AbstractError implements Nonza {
 
     @Override
     public String toString() {
-        return toXML(null).toString();
+        return toXML().toString();
     }
 
     @Override
-    public XmlStringBuilder toXML(String enclosingNamespace) {
+    public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder xml = new XmlStringBuilder();
         xml.openElement(ELEMENT);
         xml.halfOpenElement(condition.toString()).xmlnsAttribute(NAMESPACE).closeEmptyElement();

smack-core/src/main/java/org/jivesoftware/smack/packet/StreamOpen.java

@@ -96,14 +96,16 @@ public class StreamOpen implements Nonza {
     }
 
     @Override
-    public XmlStringBuilder toXML(String enclosingNamespace) {
+    public XmlStringBuilder toXML(XmlEnvironment enclosingXmlEnvironment) {
         XmlStringBuilder xml = new XmlStringBuilder();
         xml.halfOpenElement(getElementName());
+
+        String namespace = CLIENT_NAMESPACE;
         // We always want to state 'xmlns' for stream open tags.
-        if (enclosingNamespace == null) {
+        if (enclosingXmlEnvironment != null) {
-            enclosingNamespace = CLIENT_NAMESPACE;
+            namespace = enclosingXmlEnvironment.getEffectiveNamespaceOrUse(CLIENT_NAMESPACE);
         }
-        xml.attribute("xmlns", enclosingNamespace);
+        xml.attribute("xmlns", namespace);
 
         xml.attribute("to", to);
         xml.attribute("xmlns:stream", "http://etherx.jabber.org/streams");

smack-core/src/main/java/org/jivesoftware/smack/packet/TlsFailure.java

@@ -37,7 +37,7 @@ public final class TlsFailure implements Nonza {
     }
 
     @Override
-    public String toXML(String enclosingNamespace) {
+    public String toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         return '<' + ELEMENT + " xmlns='" + NAMESPACE + "'/>";
     }
 }

smack-core/src/main/java/org/jivesoftware/smack/packet/TlsProceed.java

@@ -37,7 +37,7 @@ public final class TlsProceed implements Nonza {
     }
 
     @Override
-    public String toXML(String enclosingNamespace) {
+    public String toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         return '<' + ELEMENT + " xmlns='" + NAMESPACE + "'/>";
     }
 }

smack-core/src/main/java/org/jivesoftware/smack/packet/XmlEnvironment.java

@@ -0,0 +1,134 @@
+/**
+ *
+ * Copyright 2019 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smack.packet;
+
+import org.jivesoftware.smack.util.StringUtils;
+
+public class XmlEnvironment {
+
+    public static final XmlEnvironment EMPTY = new XmlEnvironment((String) null);
+
+    private final String namespace;
+    private final String language;
+    private final XmlEnvironment next;
+
+    private transient boolean effectiveNamespaceDetermined;
+    private transient boolean effectiveLanguageDetermined;
+    private transient String effectiveNamespace;
+    private transient String effectiveLanguage;
+
+    public XmlEnvironment(String namespace) {
+        this(namespace, null);
+    }
+
+    public XmlEnvironment(String namespace, String language) {
+        this(namespace, language, null);
+    }
+
+    private XmlEnvironment(Builder builder) {
+        this(builder.namespace, builder.language, builder.next);
+    }
+
+    private XmlEnvironment(String namespace, String language, XmlEnvironment next) {
+        this.namespace = namespace;
+        this.language = language;
+        this.next = next;
+    }
+
+    public String getNamespace() {
+        return namespace;
+    }
+
+    public String getEffectiveNamespace() {
+        if (effectiveNamespaceDetermined) {
+            return effectiveNamespace;
+        }
+
+        if (StringUtils.isNotEmpty(namespace)) {
+            effectiveNamespace = namespace;
+        } else if (next != null) {
+            effectiveNamespace = next.getEffectiveNamespace();
+        }
+
+        effectiveNamespaceDetermined = true;
+        return effectiveNamespace;
+    }
+
+    public String getEffectiveNamespaceOrUse(String namespace) {
+        String effectiveNamespace = getEffectiveLanguage();
+        if (StringUtils.isNullOrEmpty(effectiveNamespace)) {
+            return namespace;
+        }
+        return effectiveNamespace;
+    }
+
+    public boolean effectiveNamespaceEquals(String namespace) {
+        String effectiveNamespace = getEffectiveNamespace();
+        if (effectiveNamespace == null) {
+            return false;
+        }
+        return effectiveNamespace.equals(namespace);
+    }
+
+    public String getLanguage() {
+        return language;
+    }
+
+    public String getEffectiveLanguage() {
+        if (effectiveLanguageDetermined) {
+            return effectiveLanguage;
+        }
+
+        if (StringUtils.isNotEmpty(language)) {
+            effectiveLanguage = language;
+        } else if (next != null) {
+            effectiveLanguage = next.getEffectiveLanguage();
+        }
+
+        effectiveLanguageDetermined = true;
+        return effectiveLanguage;
+    }
+
+    public static Builder builder() {
+        return new Builder();
+    }
+
+    public static class Builder {
+        private String namespace;
+        private String language;
+        private XmlEnvironment next;
+
+        public Builder withNamespace(String namespace) {
+            this.namespace = namespace;
+            return this;
+        }
+
+        public Builder withLanguage(String language) {
+            this.language = language;
+            return this;
+        }
+
+        public Builder withNext(XmlEnvironment next) {
+            this.next = next;
+            return this;
+        }
+
+        public XmlEnvironment build() {
+            return new XmlEnvironment(this);
+        }
+    }
+}

smack-core/src/main/java/org/jivesoftware/smack/sasl/packet/SaslStreamElements.java

@@ -44,7 +44,7 @@ public class SaslStreamElements {
         }
 
         @Override
-        public XmlStringBuilder toXML(String enclosingNamespace) {
+        public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             XmlStringBuilder xml = new XmlStringBuilder();
             xml.halfOpenElement(ELEMENT).xmlnsAttribute(NAMESPACE).attribute("mechanism", mechanism).rightAngleBracket();
             xml.optAppend(authenticationText);
@@ -84,7 +84,7 @@ public class SaslStreamElements {
         }
 
         @Override
-        public XmlStringBuilder toXML(String enclosingNamespace) {
+        public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             XmlStringBuilder xml = new XmlStringBuilder().halfOpenElement(ELEMENT).xmlnsAttribute(
                             NAMESPACE).rightAngleBracket();
             xml.optAppend(data);
@@ -120,7 +120,7 @@ public class SaslStreamElements {
         }
 
         @Override
-        public XmlStringBuilder toXML(String enclosingNamespace) {
+        public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             XmlStringBuilder xml = new XmlStringBuilder();
             xml.halfOpenElement(ELEMENT).xmlnsAttribute(NAMESPACE).rightAngleBracket();
             xml.optAppend(authenticationText);
@@ -171,7 +171,7 @@ public class SaslStreamElements {
         }
 
         @Override
-        public XmlStringBuilder toXML(String enclosingNamespace) {
+        public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             XmlStringBuilder xml = new XmlStringBuilder();
             xml.halfOpenElement(ELEMENT).xmlnsAttribute(NAMESPACE).rightAngleBracket();
             xml.optAppend(data);
@@ -236,7 +236,7 @@ public class SaslStreamElements {
         }
 
         @Override
-        public XmlStringBuilder toXML(String enclosingNamespace) {
+        public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             XmlStringBuilder xml = new XmlStringBuilder();
             xml.halfOpenElement(ELEMENT).xmlnsAttribute(NAMESPACE).rightAngleBracket();
             xml.emptyElement(saslErrorString);
@@ -247,7 +247,7 @@ public class SaslStreamElements {
 
         @Override
         public String toString() {
-            return toXML(null).toString();
+            return toXML().toString();
         }
 
         @Override

smack-core/src/main/java/org/jivesoftware/smack/util/XmlStringBuilder.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright 2014-2018 Florian Schmaus
+ * Copyright 2014-2019 Florian Schmaus
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -26,6 +26,7 @@ import org.jivesoftware.smack.packet.Element;
 import org.jivesoftware.smack.packet.ExtensionElement;
 import org.jivesoftware.smack.packet.FullyQualifiedElement;
 import org.jivesoftware.smack.packet.NamedElement;
+import org.jivesoftware.smack.packet.XmlEnvironment;
 
 import org.jxmpp.util.XmppDateTime;
 
@@ -34,15 +35,15 @@ public class XmlStringBuilder implements Appendable, CharSequence, Element {
 
     private final LazyStringBuilder sb;
 
-    private final String enclosingNamespace;
+    private final XmlEnvironment effectiveXmlEnvironment;
 
     public XmlStringBuilder() {
-        this("");
+        this((XmlEnvironment) null);
     }
 
-    public XmlStringBuilder(String enclosingNamespace) {
+    public XmlStringBuilder(XmlEnvironment effectiveXmlEnvironment) {
         sb = new LazyStringBuilder();
-        this.enclosingNamespace = enclosingNamespace != null ? enclosingNamespace : "";
+        this.effectiveXmlEnvironment = effectiveXmlEnvironment;
     }
 
     public XmlStringBuilder(ExtensionElement pe) {
@@ -55,8 +56,8 @@ public class XmlStringBuilder implements Appendable, CharSequence, Element {
         halfOpenElement(e.getElementName());
     }
 
-    public XmlStringBuilder(FullyQualifiedElement ee, String enclosingNamespace) {
+    public XmlStringBuilder(FullyQualifiedElement ee, XmlEnvironment enclosingXmlEnvironment) {
-        this(enclosingNamespace);
+        this(enclosingXmlEnvironment);
         prelude(ee);
     }
 
@@ -117,7 +118,7 @@ public class XmlStringBuilder implements Appendable, CharSequence, Element {
 
     public XmlStringBuilder element(Element element) {
         assert element != null;
-        return append(element.toXML(null));
+        return append(element.toXML());
     }
 
     public XmlStringBuilder optElement(String name, String content) {
@@ -152,7 +153,7 @@ public class XmlStringBuilder implements Appendable, CharSequence, Element {
 
     public XmlStringBuilder optElement(Element element) {
         if (element != null) {
-            append(element.toXML(null));
+            append(element.toXML());
         }
         return this;
     }
@@ -399,10 +400,12 @@ public class XmlStringBuilder implements Appendable, CharSequence, Element {
     }
 
     public XmlStringBuilder xmlnsAttribute(String value) {
-        if (value != null && !enclosingNamespace.equals(value)) {
+        if (value == null || (effectiveXmlEnvironment != null
-            XmlNsAttribute xmlNsAttribute = new XmlNsAttribute(value);
+                        && effectiveXmlEnvironment.effectiveNamespaceEquals(value))) {
-            append(xmlNsAttribute);
+            return this;
         }
+        XmlNsAttribute xmlNsAttribute = new XmlNsAttribute(value);
+        append(xmlNsAttribute);
         return this;
     }
 
@@ -460,7 +463,7 @@ public class XmlStringBuilder implements Appendable, CharSequence, Element {
 
     public XmlStringBuilder optAppend(Element element) {
         if (element != null) {
-            append(element.toXML(enclosingNamespace));
+            append(element.toXML(effectiveXmlEnvironment));
         }
         return this;
     }
@@ -475,9 +478,9 @@ public class XmlStringBuilder implements Appendable, CharSequence, Element {
         return append(elements, null);
     }
 
-    public XmlStringBuilder append(Collection<? extends Element> elements, String enclosingNamespace) {
+    public XmlStringBuilder append(Collection<? extends Element> elements, XmlEnvironment enclosingXmlEnvironment) {
         for (Element element : elements) {
-            append(element.toXML(enclosingNamespace));
+            append(element.toXML(enclosingXmlEnvironment));
         }
         return this;
     }
@@ -592,22 +595,22 @@ public class XmlStringBuilder implements Appendable, CharSequence, Element {
     }
 
     @Override
-    public CharSequence toXML(String enclosingNamespace) {
+    public CharSequence toXML(XmlEnvironment enclosingXmlEnvironment) {
         StringBuilder res = new StringBuilder();
-        appendXmlTo(res, enclosingNamespace);
+        appendXmlTo(res, enclosingXmlEnvironment);
         return res;
     }
 
-    private void appendXmlTo(StringBuilder res, String enclosingNamespace) {
+    private void appendXmlTo(StringBuilder res, XmlEnvironment enclosingXmlEnvironment) {
         for (CharSequence csq : sb.getAsList()) {
             if (csq instanceof XmlStringBuilder) {
-                ((XmlStringBuilder) csq).appendXmlTo(res, enclosingNamespace);
+                ((XmlStringBuilder) csq).appendXmlTo(res, enclosingXmlEnvironment);
             }
             else if (csq instanceof XmlNsAttribute) {
                 XmlNsAttribute xmlNsAttribute = (XmlNsAttribute) csq;
-                if (!xmlNsAttribute.value.equals(enclosingNamespace)) {
+                if (!xmlNsAttribute.value.equals(enclosingXmlEnvironment.getEffectiveNamespace())) {
                     sb.append(xmlNsAttribute);
-                    enclosingNamespace = xmlNsAttribute.value;
+                    enclosingXmlEnvironment = new XmlEnvironment(xmlNsAttribute.value);
                 }
             }
             else {

smack-core/src/test/java/org/jivesoftware/smack/StanzaCollectorTest.java

@@ -182,13 +182,13 @@ public class StanzaCollectorTest {
         }
 
         @Override
-        public String toXML(String enclosingNamespace) {
+        public String toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             return "<packetId>" + getStanzaId() + "</packetId>";
         }
 
         @Override
         public String toString() {
-            return toXML(null);
+            return toXML().toString();
         }
     }
 }

smack-core/src/test/java/org/jivesoftware/smack/compress/packet/FailureTest.java

@@ -31,7 +31,7 @@ public class FailureTest {
     @Test
     public void simpleFailureTest() throws SAXException, IOException {
         Failure failure = new Failure(Failure.CompressFailureError.processing_failed);
-        CharSequence xml = failure.toXML(null);
+        CharSequence xml = failure.toXML();
 
         final String expectedXml = "<failure xmlns='http://jabber.org/protocol/compress'><processing-failed/></failure>";
 
@@ -44,7 +44,7 @@ public class FailureTest {
                         .setCondition(Condition.bad_request)
                         .build();
         Failure failure = new Failure(Failure.CompressFailureError.setup_failed, stanzaError);
-        CharSequence xml = failure.toXML(null);
+        CharSequence xml = failure.toXML();
 
         final String expectedXml = "<failure xmlns='http://jabber.org/protocol/compress'>"
                         + "<setup-failed/>"

smack-core/src/test/java/org/jivesoftware/smack/packet/IQResponseTest.java

@@ -75,7 +75,7 @@ public class IQResponseTest {
         assertNotNull(result.getStanzaId());
         assertEquals(request.getStanzaId(), result.getStanzaId());
         assertEquals(request.getFrom(), result.getTo());
-        assertEquals(error.build().toXML(), result.getError().toXML());
+        assertEquals(error.build().toXML().toString(), result.getError().toXML().toString());
         // TODO this test was never valid
         // assertEquals(CHILD_ELEMENT, result.getChildElementXML());
     }

smack-core/src/test/java/org/jivesoftware/smack/packet/XmlEnvironmentTest.java

@@ -0,0 +1,44 @@
+/**
+ *
+ * Copyright 2019 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smack.packet;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+
+public class XmlEnvironmentTest {
+
+    @Test
+    public void testNamespaceScope() {
+        final String outerNamespace = "outerNamespace";
+
+        XmlEnvironment outer = XmlEnvironment.builder().withNamespace(outerNamespace).build();
+        XmlEnvironment inner = XmlEnvironment.builder().withNext(outer).build();
+
+        assertEquals(outerNamespace, inner.getEffectiveNamespace());
+    }
+
+    @Test
+    public void testLanguageScope() {
+        final String outerLanguage = "outerLanguage";
+
+        XmlEnvironment outer = XmlEnvironment.builder().withLanguage(outerLanguage).build();
+        XmlEnvironment inner = XmlEnvironment.builder().withNext(outer).build();
+
+        assertEquals(outerLanguage, inner.getEffectiveLanguage());
+    }
+}

smack-core/src/test/java/org/jivesoftware/smack/parsing/StandardExtensionElementParserTest.java

@@ -31,7 +31,7 @@ public class StandardExtensionElementParserTest {
         builder.addAttribute("attr1", "attr1-value");
         builder.addElement(StandardExtensionElement.builder("bar", "ns2").addAttribute("attr2", "attr2-value").build());
         builder.addElement("another-element", "another-element-text");
-        final String elementString = builder.build().toXML(null).toString();
+        final String elementString = builder.build().toXML().toString();
 
         StandardExtensionElement parsedElement = StandardExtensionElementProvider.INSTANCE.parse(getParserFor(elementString));
 
@@ -46,7 +46,7 @@ public class StandardExtensionElementParserTest {
 
         assertEquals("another-element-text", parsedElement.getFirstElement("another-element").getText());
 
-        String parsedElementString = parsedElement.toXML(null).toString();
+        String parsedElementString = parsedElement.toXML().toString();
         assertEquals(elementString, parsedElementString);
     }
 
@@ -55,7 +55,7 @@ public class StandardExtensionElementParserTest {
         StandardExtensionElement.Builder builder = StandardExtensionElement.builder("foo", "ns1-value");
         builder.addAttribute("xmlns:ns2", "ns2-value");
         builder.addAttribute("ns2:bar", "bar-ns2-value");
-        final String elementString = builder.build().toXML(null).toString();
+        final String elementString = builder.build().toXML().toString();
 
         StandardExtensionElement parsedElement = StandardExtensionElementProvider.INSTANCE.parse(getParserFor(elementString));
         assertEquals("foo", parsedElement.getElementName());

smack-core/src/test/java/org/jivesoftware/smack/util/PacketParserUtilsTest.java

@@ -85,7 +85,7 @@ public class PacketParserUtilsTest {
         assertTrue(message.getBodyLanguages().isEmpty());
         assertEquals(defaultLanguage, message.getBody(defaultLanguage));
         assertNull(message.getBody(otherLanguage));
-        assertXMLEqual(control, message.toXML(null).toString());
+        assertXMLEqual(control, message.toXML().toString());
 
         // message has non-default language, body has no language
         control = XMLBuilder.create("message")
@@ -105,7 +105,7 @@ public class PacketParserUtilsTest {
         assertTrue(message.getBodyLanguages().isEmpty());
         assertEquals(otherLanguage, message.getBody(otherLanguage));
         assertNull(message.getBody(defaultLanguage));
-        assertXMLEqual(control, message.toXML(null).toString());
+        assertXMLEqual(control, message.toXML().toString());
 
         // message has no language, body has no language
         control = XMLBuilder.create("message")
@@ -124,7 +124,7 @@ public class PacketParserUtilsTest {
         assertTrue(message.getBodyLanguages().isEmpty());
         assertEquals(defaultLanguage, message.getBody(null));
         assertNull(message.getBody(otherLanguage));
-        assertXMLEqual(control, message.toXML(null).toString());
+        assertXMLEqual(control, message.toXML().toString());
 
         // message has no language, body has default language
         control = XMLBuilder.create("message")
@@ -145,7 +145,7 @@ public class PacketParserUtilsTest {
         assertEquals(defaultLanguage, message.getBody(defaultLanguage));
         assertNull(message.getBody(otherLanguage));
 
-        assertXMLEqual(control, message.toXML(null).toString());
+        assertXMLEqual(control, message.toXML().toString());
 
         // message has no language, body has non-default language
         control = XMLBuilder.create("message")
@@ -166,7 +166,7 @@ public class PacketParserUtilsTest {
         assertTrue(message.getBodyLanguages().contains(otherLanguage));
         assertEquals(otherLanguage, message.getBody(otherLanguage));
         assertNull(message.getBody(defaultLanguage));
-        assertXMLEqual(control, message.toXML(null).toString());
+        assertXMLEqual(control, message.toXML().toString());
 
         // message has default language, body has non-default language
         control = XMLBuilder.create("message")
@@ -188,7 +188,7 @@ public class PacketParserUtilsTest {
         assertTrue(message.getBodyLanguages().contains(otherLanguage));
         assertEquals(otherLanguage, message.getBody(otherLanguage));
         assertNull(message.getBody(defaultLanguage));
-        assertXMLEqual(control, message.toXML(null).toString());
+        assertXMLEqual(control, message.toXML().toString());
 
         // message has non-default language, body has default language
         control = XMLBuilder.create("message")
@@ -210,7 +210,7 @@ public class PacketParserUtilsTest {
         assertTrue(message.getBodyLanguages().contains(defaultLanguage));
         assertEquals(defaultLanguage, message.getBody(defaultLanguage));
         assertNull(message.getBody(otherLanguage));
-        assertXMLEqual(control, message.toXML(null).toString());
+        assertXMLEqual(control, message.toXML().toString());
 
     }
 
@@ -393,7 +393,7 @@ public class PacketParserUtilsTest {
         assertEquals(2, message.getBodies().size());
         assertEquals(1, message.getBodyLanguages().size());
         assertTrue(message.getBodyLanguages().contains(otherLanguage));
-        assertXMLEqual(control, message.toXML(null).toString());
+        assertXMLEqual(control, message.toXML().toString());
 
         // message has non-default language, first body no language, second body default language
         control = XMLBuilder.create("message")
@@ -419,7 +419,7 @@ public class PacketParserUtilsTest {
         assertEquals(2, message.getBodies().size());
         assertEquals(1, message.getBodyLanguages().size());
         assertTrue(message.getBodyLanguages().contains(defaultLanguage));
-        assertXMLEqual(control, message.toXML(null).toString());
+        assertXMLEqual(control, message.toXML().toString());
     }
 
     // TODO: Re-enable once we throw an exception on duplicate body elements.
@@ -452,7 +452,7 @@ public class PacketParserUtilsTest {
         assertEquals(defaultLanguage, message.getBody(defaultLanguage));
         assertEquals(1, message.getBodies().size());
         assertEquals(0, message.getBodyLanguages().size());
-        assertXMLNotEqual(control, message.toXML(null).toString());
+        assertXMLNotEqual(control, message.toXML().toString());
     }
 
     @Ignore
@@ -510,7 +510,7 @@ public class PacketParserUtilsTest {
         assertEquals(otherLanguage, message.getBody(otherLanguage));
         assertEquals(2, message.getBodies().size());
         assertEquals(1, message.getBodyLanguages().size());
-        assertXMLEqual(control, message.toXML(null).toString());
+        assertXMLEqual(control, message.toXML().toString());
     }
 
     @Test
@@ -692,7 +692,7 @@ public class PacketParserUtilsTest {
 
         Message message = PacketParserUtils.parseMessage(TestUtils.getMessageParser(control));
 
-        fail("Should throw exception. Instead got message: " + message.toXML(null).toString());
+        fail("Should throw exception. Instead got message: " + message.toXML().toString());
     }
 
     @Test
@@ -763,7 +763,7 @@ public class PacketParserUtilsTest {
             .asString(outputProperties);
 
         Stanza message = PacketParserUtils.parseStanza(control);
-        XmlUnitUtils.assertSimilar(control, message.toXML(null));
+        XmlUnitUtils.assertSimilar(control, message.toXML());
     }
 
     @Test

smack-debug-slf4j/src/main/java/org/jivesoftware/smackx/debugger/slf4j/SLF4JSmackDebugger.java

@@ -105,14 +105,14 @@ public class SLF4JSmackDebugger extends SmackDebugger  {
     @Override
     public void onIncomingStreamElement(TopLevelStreamElement streamElement) {
         if (SLF4JSmackDebugger.printInterpreted.get() && logger.isDebugEnabled()) {
-            logger.debug("IN {}: {}", streamElement.getClass().getName(), streamElement.toXML(null));
+            logger.debug("IN {}: {}", streamElement.getClass().getName(), streamElement.toXML());
         }
     }
 
     @Override
     public void onOutgoingStreamElement(TopLevelStreamElement streamElement) {
         if (SLF4JSmackDebugger.printInterpreted.get() && logger.isDebugEnabled()) {
-            logger.debug("OUT {}: {}", streamElement.getClass().getName(), streamElement.toXML(null));
+            logger.debug("OUT {}: {}", streamElement.getClass().getName(), streamElement.toXML());
         }
     }
 

smack-debug/src/main/java/org/jivesoftware/smackx/debugger/EnhancedDebugger.java

@@ -74,6 +74,7 @@ import org.jivesoftware.smack.packet.Message;
 import org.jivesoftware.smack.packet.Presence;
 import org.jivesoftware.smack.packet.Stanza;
 import org.jivesoftware.smack.packet.TopLevelStreamElement;
+import org.jivesoftware.smack.packet.XmlEnvironment;
 import org.jivesoftware.smack.util.ObservableReader;
 import org.jivesoftware.smack.util.ObservableWriter;
 import org.jivesoftware.smack.util.ReaderListener;
@@ -810,7 +811,7 @@ public class EnhancedDebugger extends SmackDebugger {
 
                 messagesTable.addRow(
                         new Object[] {
-                                XmlUtil.prettyFormatXml(packet.toXML(null).toString()),
+                                XmlUtil.prettyFormatXml(packet.toXML().toString()),
                                 dateFormatter.format(new Date()),
                                 packetReceivedIcon,
                                 packetTypeIcon,
@@ -881,7 +882,7 @@ public class EnhancedDebugger extends SmackDebugger {
 
                 messagesTable.addRow(
                         new Object[] {
-                                XmlUtil.prettyFormatXml(packet.toXML(null).toString()),
+                                XmlUtil.prettyFormatXml(packet.toXML().toString()),
                                 dateFormatter.format(new Date()),
                                 packetSentIcon,
                                 packetTypeIcon,
@@ -938,15 +939,14 @@ public class EnhancedDebugger extends SmackDebugger {
         }
 
         @Override
-        public String toXML(String enclosingNamespace) {
+        public String toXML(XmlEnvironment enclosingNamespace) {
             return text;
         }
 
         @Override
         public String toString() {
-            return toXML(null);
+            return toXML((XmlEnvironment) null);
         }
-
     }
 
     /**

smack-debug/src/main/java/org/jivesoftware/smackx/debugger/LiteDebugger.java

@@ -323,8 +323,8 @@ public class LiteDebugger extends SmackDebugger {
 
     @Override
     public void onIncomingStreamElement(TopLevelStreamElement streamElement) {
-        interpretedText1.append(streamElement.toXML(null).toString());
+        interpretedText1.append(streamElement.toXML().toString());
-        interpretedText2.append(streamElement.toXML(null).toString());
+        interpretedText2.append(streamElement.toXML().toString());
         interpretedText1.append(NEWLINE);
         interpretedText2.append(NEWLINE);
     }

smack-experimental/src/main/java/org/jivesoftware/smackx/carbons/packet/CarbonExtension.java

@@ -79,10 +79,10 @@ public class CarbonExtension implements ExtensionElement {
     }
 
     @Override
-    public XmlStringBuilder toXML(String enclosingNamespace) {
+    public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder xml = new XmlStringBuilder(this);
         xml.rightAngleBracket();
-        xml.append(fwd.toXML(null));
+        xml.append(fwd.toXML());
         xml.closeElement(this);
         return xml;
     }
@@ -150,7 +150,7 @@ public class CarbonExtension implements ExtensionElement {
         }
 
         @Override
-        public String toXML(String enclosingNamespace) {
+        public String toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             return "<" + ELEMENT + " xmlns='" + NAMESPACE + "'/>";
         }
 

smack-experimental/src/main/java/org/jivesoftware/smackx/chat_markers/element/ChatMarkersElements.java

@@ -65,7 +65,7 @@ public class ChatMarkersElements {
         }
 
         @Override
-        public CharSequence toXML(String enclosingNamespace) {
+        public CharSequence toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             XmlStringBuilder xml = new XmlStringBuilder(this);
             xml.closeEmptyElement();
             return xml;
@@ -93,7 +93,7 @@ public class ChatMarkersElements {
         }
 
         @Override
-        public final XmlStringBuilder toXML(String enclosingNamespace) {
+        public final XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             XmlStringBuilder xml = new XmlStringBuilder(this);
             xml.attribute("id", id);
             xml.closeEmptyElement();

smack-experimental/src/main/java/org/jivesoftware/smackx/csi/packet/ClientStateIndication.java

@@ -45,7 +45,7 @@ public class ClientStateIndication {
         }
 
         @Override
-        public String toXML(String enclosingNamespace) {
+        public String toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             return '<' + ELEMENT + " xmlns='" + NAMESPACE + "'/>";
         }
     }
@@ -68,7 +68,7 @@ public class ClientStateIndication {
         }
 
         @Override
-        public String toXML(String enclosingNamespace) {
+        public String toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             return '<' + ELEMENT + " xmlns='" + NAMESPACE + "'/>";
         }
     }
@@ -86,7 +86,7 @@ public class ClientStateIndication {
         }
 
         @Override
-        public String toXML(String enclosingNamespace) {
+        public String toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             return '<' + ELEMENT + " xmlns='" + NAMESPACE + "'/>";
         }
 

smack-experimental/src/main/java/org/jivesoftware/smackx/eme/element/ExplicitMessageEncryptionElement.java

@@ -135,7 +135,7 @@ public class ExplicitMessageEncryptionElement implements ExtensionElement {
     }
 
     @Override
-    public XmlStringBuilder toXML(String enclosingNamespace) {
+    public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder xml = new XmlStringBuilder(this);
         xml.attribute("namespace", getEncryptionNamespace());
         xml.optAttribute("name", getName());

smack-experimental/src/main/java/org/jivesoftware/smackx/hashes/element/HashElement.java

@@ -93,7 +93,7 @@ public class HashElement implements ExtensionElement {
     }
 
     @Override
-    public CharSequence toXML(String enclosingNamespace) {
+    public CharSequence toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder sb = new XmlStringBuilder(this);
         sb.attribute(ATTR_ALGO, algorithm.toString());
         sb.rightAngleBracket();
@@ -120,6 +120,6 @@ public class HashElement implements ExtensionElement {
 
     @Override
     public int hashCode() {
-        return toXML(null).toString().hashCode();
+        return toXML().toString().hashCode();
     }
 }

smack-experimental/src/main/java/org/jivesoftware/smackx/hints/element/NoCopyHint.java

@@ -38,7 +38,7 @@ public final class NoCopyHint extends MessageProcessingHint {
     }
 
     @Override
-    public String toXML(String enclosingNamespace) {
+    public String toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         return '<' + ELEMENT + " xmlns='" + NAMESPACE + "'/>";
     }
 

smack-experimental/src/main/java/org/jivesoftware/smackx/hints/element/NoPermanentStoreHint.java

@@ -38,7 +38,7 @@ public final class NoPermanentStoreHint extends MessageProcessingHint {
     }
 
     @Override
-    public String toXML(String enclosingNamespace) {
+    public String toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         return '<' + ELEMENT + " xmlns='" + NAMESPACE + "'/>";
     }
 

smack-experimental/src/main/java/org/jivesoftware/smackx/hints/element/NoStoreHint.java

@@ -38,7 +38,7 @@ public final class NoStoreHint extends MessageProcessingHint {
     }
 
     @Override
-    public String toXML(String enclosingNamespace) {
+    public String toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         return '<' + ELEMENT + " xmlns='" + NAMESPACE + "'/>";
     }
 

smack-experimental/src/main/java/org/jivesoftware/smackx/hints/element/StoreHint.java

@@ -38,7 +38,7 @@ public final class StoreHint extends MessageProcessingHint {
     }
 
     @Override
-    public String toXML(String enclosingNamespace) {
+    public String toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         return '<' + ELEMENT + " xmlns='" + NAMESPACE + "'/>";
     }
 

smack-experimental/src/main/java/org/jivesoftware/smackx/hoxt/packet/AbstractHttpOverXmpp.java

@@ -171,7 +171,7 @@ public abstract class AbstractHttpOverXmpp extends IQ {
          * @return xml representation of this object
          */
         @Override
-        public XmlStringBuilder toXML(String enclosingNamespace) {
+        public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             XmlStringBuilder xml = new XmlStringBuilder(this);
             xml.rightAngleBracket();
             xml.element(child);
@@ -215,7 +215,7 @@ public abstract class AbstractHttpOverXmpp extends IQ {
         }
 
         @Override
-        public XmlStringBuilder toXML(String enclosingNamespace) {
+        public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             XmlStringBuilder xml = new XmlStringBuilder(this);
             xml.rightAngleBracket();
             xml.optAppend(text);
@@ -259,7 +259,7 @@ public abstract class AbstractHttpOverXmpp extends IQ {
         }
 
         @Override
-        public XmlStringBuilder toXML(String enclosingNamespace) {
+        public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             XmlStringBuilder xml = new XmlStringBuilder(this);
             xml.rightAngleBracket();
             xml.optAppend(text);
@@ -303,7 +303,7 @@ public abstract class AbstractHttpOverXmpp extends IQ {
         }
 
         @Override
-        public XmlStringBuilder toXML(String enclosingNamespace) {
+        public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             XmlStringBuilder xml = new XmlStringBuilder(this);
             xml.rightAngleBracket();
             xml.optAppend(text);
@@ -347,7 +347,7 @@ public abstract class AbstractHttpOverXmpp extends IQ {
         }
 
         @Override
-        public XmlStringBuilder toXML(String enclosingNamespace) {
+        public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             XmlStringBuilder xml = new XmlStringBuilder(this);
             xml.attribute("streamId", streamId);
             xml.closeEmptyElement();
@@ -390,7 +390,7 @@ public abstract class AbstractHttpOverXmpp extends IQ {
         }
 
         @Override
-        public XmlStringBuilder toXML(String enclosingNamespace) {
+        public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             XmlStringBuilder xml = new XmlStringBuilder(this);
             xml.attribute("sid", sid);
             xml.closeEmptyElement();

smack-experimental/src/main/java/org/jivesoftware/smackx/hoxt/packet/Base64BinaryChunk.java

@@ -117,7 +117,7 @@ public class Base64BinaryChunk implements ExtensionElement {
     }
 
     @Override
-    public XmlStringBuilder toXML(String enclosingNamespace) {
+    public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder xml = new XmlStringBuilder(this);
         xml.attribute("streamId", streamId);
         xml.attribute("nr", nr);

smack-experimental/src/main/java/org/jivesoftware/smackx/httpfileupload/element/FileTooLargeError.java

@@ -58,7 +58,7 @@ public class FileTooLargeError implements ExtensionElement {
     }
 
     @Override
-    public XmlStringBuilder toXML(String enclosingNamespace) {
+    public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder xml = new XmlStringBuilder(this);
         xml.rightAngleBracket();
         xml.element("max-file-size", String.valueOf(maxFileSize));

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/control/element/SetData.java

@@ -82,7 +82,7 @@ public abstract class SetData implements NamedElement {
      * @return the stanza extension as XML.
      */
     @Override
-    public final XmlStringBuilder toXML(String enclosingNamespace) {
+    public final XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder xml = new XmlStringBuilder(this);
         xml.attribute("name", name);
         xml.attribute("value", value);

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/data/element/IoTDataField.java

@@ -52,7 +52,7 @@ public abstract class IoTDataField implements NamedElement {
     }
 
     @Override
-    public final XmlStringBuilder toXML(String enclosingNamespace) {
+    public final XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder xml = new XmlStringBuilder(this);
         xml.attribute("name", name).attribute("value", getValueString());
         // TODO handle 'unit' attribute as special case if <numeric/> is implemented.

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/data/element/IoTFieldsExtension.java

@@ -68,7 +68,7 @@ public class IoTFieldsExtension implements ExtensionElement {
     }
 
     @Override
-    public XmlStringBuilder toXML(String enclosingNamespace) {
+    public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder xml = new XmlStringBuilder(this);
         xml.attribute("seqnr", Integer.toString(seqNr));
         xml.attribute("done", done);

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/data/element/NodeElement.java

@@ -50,7 +50,7 @@ public class NodeElement implements NamedElement {
     }
 
     @Override
-    public XmlStringBuilder toXML(String enclosingNamespace) {
+    public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder xml = new XmlStringBuilder(this);
         nodeInfo.appendTo(xml);
         xml.rightAngleBracket();

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/data/element/TimestampElement.java

@@ -45,7 +45,7 @@ public class TimestampElement implements NamedElement {
     }
 
     @Override
-    public XmlStringBuilder toXML(String enclosingNamespace) {
+    public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder xml = new XmlStringBuilder(this);
         xml.attribute("value", date);
         xml.rightAngleBracket();

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/discovery/element/Tag.java

@@ -58,7 +58,7 @@ public class Tag implements NamedElement {
     }
 
     @Override
-    public XmlStringBuilder toXML(String enclosingNamespace) {
+    public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder xml = new XmlStringBuilder(this);
         xml.attribute("name", name);
         xml.attribute("value", value);

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/provisioning/element/Friend.java

@@ -45,7 +45,7 @@ public class Friend implements ExtensionElement {
     }
 
     @Override
-    public XmlStringBuilder toXML(String enclosingNamespace) {
+    public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder xml = new XmlStringBuilder(this);
         xml.attribute("jid", friend);
         xml.closeEmptyElement();

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/provisioning/element/Unfriend.java

@@ -47,7 +47,7 @@ public class Unfriend implements ExtensionElement {
     }
 
     @Override
-    public XmlStringBuilder toXML(String enclosingNamespace) {
+    public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder xml = new XmlStringBuilder(this);
         xml.attribute("jid", jid);
         xml.closeEmptyElement();

smack-experimental/src/main/java/org/jivesoftware/smackx/jingle_filetransfer/element/Checksum.java

@@ -46,7 +46,7 @@ public class Checksum implements ExtensionElement {
     }
 
     @Override
-    public CharSequence toXML(String enclosingNamespace) {
+    public CharSequence toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder sb = new XmlStringBuilder(this);
         sb.optAttribute(ATTR_CREATOR, creator);
         sb.optAttribute(ATTR_NAME, name);

smack-experimental/src/main/java/org/jivesoftware/smackx/jingle_filetransfer/element/JingleFileTransferChild.java

@@ -86,7 +86,7 @@ public class JingleFileTransferChild extends JingleContentDescriptionChildElemen
     }
 
     @Override
-    public CharSequence toXML(String enclosingNamespace) {
+    public CharSequence toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder sb = new XmlStringBuilder(this);
         sb.rightAngleBracket();
 

smack-experimental/src/main/java/org/jivesoftware/smackx/jingle_filetransfer/element/Range.java

@@ -99,7 +99,7 @@ public class Range implements NamedElement {
     }
 
     @Override
-    public CharSequence toXML(String enclosingNamespace) {
+    public CharSequence toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder sb =  new XmlStringBuilder(this);
 
         if (offset > 0) {
@@ -133,6 +133,6 @@ public class Range implements NamedElement {
 
     @Override
     public int hashCode() {
-        return toXML(null).toString().hashCode();
+        return toXML().toString().hashCode();
     }
 }

smack-experimental/src/main/java/org/jivesoftware/smackx/json/packet/AbstractJsonPacketExtension.java

@@ -32,7 +32,7 @@ public abstract class AbstractJsonPacketExtension implements ExtensionElement {
     }
 
     @Override
-    public final XmlStringBuilder toXML(String enclosingNamespace) {
+    public final XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder xml = new XmlStringBuilder(this);
         xml.rightAngleBracket();
         xml.append(json);

smack-experimental/src/main/java/org/jivesoftware/smackx/mam/element/MamElements.java

@@ -126,7 +126,7 @@ public class MamElements {
         }
 
         @Override
-        public CharSequence toXML(String enclosingNamespace) {
+        public CharSequence toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             XmlStringBuilder xml = new XmlStringBuilder();
             xml.halfOpenElement(this);
             xml.xmlnsAttribute(NAMESPACE);
@@ -167,7 +167,7 @@ public class MamElements {
         }
 
         @Override
-        public CharSequence toXML(String enclosingNamespace) {
+        public CharSequence toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             XmlStringBuilder xml = new XmlStringBuilder();
             xml.openElement("always");
 
@@ -201,7 +201,7 @@ public class MamElements {
         }
 
         @Override
-        public CharSequence toXML(String enclosingNamespace) {
+        public CharSequence toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             XmlStringBuilder xml = new XmlStringBuilder();
             xml.openElement("never");
 

smack-experimental/src/main/java/org/jivesoftware/smackx/message_markup/element/BlockQuoteElement.java

@@ -51,7 +51,7 @@ public class BlockQuoteElement implements MarkupElement.BlockLevelMarkupElement
     }
 
     @Override
-    public XmlStringBuilder toXML(String enclosingNamespace) {
+    public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder xml = new XmlStringBuilder();
         xml.halfOpenElement(this);
         xml.attribute(ATTR_START, getStart());

smack-experimental/src/main/java/org/jivesoftware/smackx/message_markup/element/CodeBlockElement.java

@@ -51,7 +51,7 @@ public class CodeBlockElement implements MarkupElement.BlockLevelMarkupElement {
     }
 
     @Override
-    public XmlStringBuilder toXML(String enclosingNamespace) {
+    public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder xml = new XmlStringBuilder();
         xml.halfOpenElement(this);
         xml.attribute(ATTR_START, getStart());

smack-experimental/src/main/java/org/jivesoftware/smackx/message_markup/element/ListElement.java

@@ -68,7 +68,7 @@ public class ListElement implements MarkupElement.MarkupChildElement {
     }
 
     @Override
-    public CharSequence toXML(String enclosingNamespace) {
+    public CharSequence toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder xml = new XmlStringBuilder();
         xml.halfOpenElement(this);
         xml.attribute(ATTR_START, getStart());
@@ -76,7 +76,7 @@ public class ListElement implements MarkupElement.MarkupChildElement {
         xml.rightAngleBracket();
 
         for (ListEntryElement li : getEntries()) {
-            xml.append(li.toXML(null));
+            xml.append(li.toXML());
         }
 
         xml.closeElement(this);
@@ -110,7 +110,7 @@ public class ListElement implements MarkupElement.MarkupChildElement {
         }
 
         @Override
-        public XmlStringBuilder toXML(String enclosingNamespace) {
+        public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             XmlStringBuilder xml = new XmlStringBuilder();
             xml.halfOpenElement(this);
             xml.attribute(ATTR_START, getStart());

smack-experimental/src/main/java/org/jivesoftware/smackx/message_markup/element/MarkupElement.java

@@ -68,11 +68,11 @@ public class MarkupElement implements ExtensionElement {
     }
 
     @Override
-    public XmlStringBuilder toXML(String enclosingNamespace) {
+    public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder xml = new XmlStringBuilder(this).rightAngleBracket();
 
         for (MarkupChildElement child : getChildElements()) {
-            xml.append(child.toXML(null));
+            xml.append(child.toXML());
         }
 
         xml.closeElement(this);

smack-experimental/src/main/java/org/jivesoftware/smackx/message_markup/element/SpanElement.java

@@ -76,7 +76,7 @@ public class SpanElement implements MarkupElement.MarkupChildElement {
     }
 
     @Override
-    public XmlStringBuilder toXML(String enclosingNamespace) {
+    public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder xml = new XmlStringBuilder();
         xml.halfOpenElement(this);
         xml.attribute(ATTR_START, getStart());

smack-experimental/src/main/java/org/jivesoftware/smackx/muclight/element/MUCLightElements.java

@@ -94,7 +94,7 @@ public abstract class MUCLightElements {
         }
 
         @Override
-        public CharSequence toXML(String enclosingNamespace) {
+        public CharSequence toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             XmlStringBuilder xml = new XmlStringBuilder(this);
             xml.rightAngleBracket();
 
@@ -208,7 +208,7 @@ public abstract class MUCLightElements {
         }
 
         @Override
-        public CharSequence toXML(String enclosingNamespace) {
+        public CharSequence toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             XmlStringBuilder xml = new XmlStringBuilder(this);
             xml.rightAngleBracket();
 
@@ -255,7 +255,7 @@ public abstract class MUCLightElements {
         }
 
         @Override
-        public CharSequence toXML(String enclosingNamespace) {
+        public CharSequence toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             XmlStringBuilder xml = new XmlStringBuilder();
             xml.openElement("configuration");
 
@@ -296,7 +296,7 @@ public abstract class MUCLightElements {
         }
 
         @Override
-        public CharSequence toXML(String enclosingNamespace) {
+        public CharSequence toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             XmlStringBuilder xml = new XmlStringBuilder();
             xml.openElement("occupants");
 
@@ -335,7 +335,7 @@ public abstract class MUCLightElements {
         }
 
         @Override
-        public CharSequence toXML(String enclosingNamespace) {
+        public CharSequence toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             XmlStringBuilder xml = new XmlStringBuilder();
             xml.halfOpenElement("user");
             xml.attribute("affiliation", affiliation);
@@ -373,7 +373,7 @@ public abstract class MUCLightElements {
         }
 
         @Override
-        public CharSequence toXML(String enclosingNamespace) {
+        public CharSequence toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             XmlStringBuilder xml = new XmlStringBuilder();
 
             String tag = isRoom ? "room" : "user";

smack-experimental/src/main/java/org/jivesoftware/smackx/push_notifications/element/PushNotificationsElements.java

@@ -78,7 +78,7 @@ public class PushNotificationsElements {
         }
 
         @Override
-        public CharSequence toXML(String enclosingNamespace) {
+        public CharSequence toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             XmlStringBuilder xml = new XmlStringBuilder(this);
 
             xml.attribute("node", node);

smack-experimental/src/main/java/org/jivesoftware/smackx/reference/element/ReferenceElement.java

@@ -174,7 +174,7 @@ public class ReferenceElement implements ExtensionElement {
     }
 
     @Override
-    public XmlStringBuilder toXML(String enclosingNamespace) {
+    public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder xml = new XmlStringBuilder(this)
                 .optIntAttribute(ATTR_BEGIN, begin != null ? begin : -1)
                 .optIntAttribute(ATTR_END, end != null ? end : -1)
@@ -186,7 +186,7 @@ public class ReferenceElement implements ExtensionElement {
             return xml.closeEmptyElement();
         } else {
             return xml.rightAngleBracket()
-                    .append(child.toXML(null))
+                    .append(child.toXML())
                     .closeElement(this);
         }
     }

smack-experimental/src/main/java/org/jivesoftware/smackx/sid/element/OriginIdElement.java

@@ -76,7 +76,7 @@ public class OriginIdElement extends StableAndUniqueIdElement {
     }
 
     @Override
-    public CharSequence toXML(String enclosingNamespace) {
+    public CharSequence toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         return new XmlStringBuilder(this)
                 .attribute(ATTR_ID, getId())
                 .closeEmptyElement();

smack-experimental/src/main/java/org/jivesoftware/smackx/sid/element/StanzaIdElement.java

@@ -72,7 +72,7 @@ public class StanzaIdElement extends StableAndUniqueIdElement {
     }
 
     @Override
-    public XmlStringBuilder toXML(String enclosingNamespace) {
+    public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         return new XmlStringBuilder(this)
                 .attribute(ATTR_ID, getId())
                 .attribute(ATTR_BY, getBy())

smack-experimental/src/main/java/org/jivesoftware/smackx/spoiler/element/SpoilerElement.java

@@ -151,7 +151,7 @@ public class SpoilerElement implements ExtensionElement {
     }
 
     @Override
-    public CharSequence toXML(String enclosingNamespace) {
+    public CharSequence toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder xml = new XmlStringBuilder(this);
         xml.optXmlLangAttribute(getLanguage());
         if (getHint() == null) {

smack-experimental/src/test/java/org/jivesoftware/smackx/chat_markers/MarkableExtensionTest.java

@@ -42,18 +42,18 @@ public class MarkableExtensionTest {
         message.setStanzaId("message-1");
         message.setBody("My lord, dispatch; read o'er these articles.");
         message.addExtension(ChatMarkersElements.MarkableExtension.INSTANCE);
-        Assert.assertEquals(markableMessageStanza, message.toXML(null).toString());
+        Assert.assertEquals(markableMessageStanza, message.toXML().toString());
     }
 
     @Test
     public void checkMarkableProvider() throws Exception {
         XmlPullParser parser = PacketParserUtils.getParserFor(markableExtension);
         MarkableExtension markableExtension1 = new MarkableProvider().parse(parser);
-        Assert.assertEquals(markableExtension, markableExtension1.toXML(null).toString());
+        Assert.assertEquals(markableExtension, markableExtension1.toXML().toString());
 
         Message message = PacketParserUtils.parseStanza(markableMessageStanza);
         MarkableExtension markableExtension2 = MarkableExtension.from(message);
-        Assert.assertEquals(markableExtension, markableExtension2.toXML(null).toString());
+        Assert.assertEquals(markableExtension, markableExtension2.toXML().toString());
     }
 
 }

smack-experimental/src/test/java/org/jivesoftware/smackx/hashes/HashElementTest.java

@@ -41,10 +41,10 @@ public class HashElementTest extends SmackTestSuite {
         String message = "Hello World!";
         HashElement element = HashManager.calculateHashElement(SHA_256, StringUtils.toUtf8Bytes(message));
         String expected = "<hash xmlns='urn:xmpp:hashes:2' algo='sha-256'>f4OxZX/x/FO5LcGBSKHWXfwtSx+j1ncoSt3SABJtkGk=</hash>";
-        assertEquals(expected, element.toXML(null).toString());
+        assertEquals(expected, element.toXML().toString());
 
         HashElement parsed = new HashElementProvider().parse(TestUtils.getParser(expected));
-        assertEquals(expected, parsed.toXML(null).toString());
+        assertEquals(expected, parsed.toXML().toString());
         assertEquals(SHA_256, parsed.getAlgorithm());
         assertEquals("f4OxZX/x/FO5LcGBSKHWXfwtSx+j1ncoSt3SABJtkGk=", parsed.getHashB64());
         assertArrayEquals(HashManager.sha_256(message), parsed.getHash());

smack-experimental/src/test/java/org/jivesoftware/smackx/httpfileupload/FileTooLargeErrorCreateTest.java

@@ -32,7 +32,7 @@ public class FileTooLargeErrorCreateTest {
         FileTooLargeError fileTooLargeError = new FileTooLargeError(20000);
 
         Assert.assertEquals(20000, fileTooLargeError.getMaxFileSize());
-        Assert.assertEquals(fileTooLargeErrorExtensionExample, fileTooLargeError.toXML(null).toString());
+        Assert.assertEquals(fileTooLargeErrorExtensionExample, fileTooLargeError.toXML().toString());
 
     }
 

smack-experimental/src/test/java/org/jivesoftware/smackx/mam/FiltersTest.java

@@ -58,7 +58,7 @@ public class FiltersTest extends MamTest {
         List<String> values = new ArrayList<>();
         values.add(XmppDateTime.formatXEP0082Date(date));
 
-        assertEquals(getMamXMemberWith(fields, values), dataForm.toXML(null).toString());
+        assertEquals(getMamXMemberWith(fields, values), dataForm.toXML().toString());
     }
 
     @Test
@@ -73,7 +73,7 @@ public class FiltersTest extends MamTest {
         List<String> values = new ArrayList<>();
         values.add(XmppDateTime.formatXEP0082Date(date));
 
-        assertEquals(getMamXMemberWith(fields, values), dataForm.toXML(null).toString());
+        assertEquals(getMamXMemberWith(fields, values), dataForm.toXML().toString());
     }
 
     @Test
@@ -88,7 +88,7 @@ public class FiltersTest extends MamTest {
         List<CharSequence> values = new ArrayList<>();
         values.add(jid);
 
-        assertEquals(getMamXMemberWith(fields, values), dataForm.toXML(null).toString());
+        assertEquals(getMamXMemberWith(fields, values), dataForm.toXML().toString());
     }
 
 }

smack-experimental/src/test/java/org/jivesoftware/smackx/mam/RetrieveFormFieldsTest.java

@@ -64,7 +64,7 @@ public class RetrieveFormFieldsTest extends MamTest {
                         .build();
         DataForm dataForm = mamQueryArgs.getDataForm();
 
-        String dataFormResult = dataForm.toXML(null).toString();
+        String dataFormResult = dataForm.toXML().toString();
 
         assertXmlSimilar(additionalFieldsStanza, dataFormResult);
     }

smack-experimental/src/test/java/org/jivesoftware/smackx/message_markup/MessageMarkupTest.java

@@ -45,7 +45,7 @@ public class MessageMarkupTest extends SmackTestSuite {
                 "</markup>";
         MarkupElement.Builder m = MarkupElement.getBuilder();
         m.setEmphasis(9, 15);
-        assertXMLEqual(xml, m.build().toXML(null).toString());
+        assertXMLEqual(xml, m.build().toXML().toString());
 
         XmlPullParser parser = TestUtils.getParser(xml);
         MarkupElement parsed = new MarkupElementProvider().parse(parser);
@@ -69,7 +69,7 @@ public class MessageMarkupTest extends SmackTestSuite {
                 "</markup>";
         MarkupElement.Builder m = MarkupElement.getBuilder();
         m.setCode(9, 15);
-        assertXMLEqual(xml, m.build().toXML(null).toString());
+        assertXMLEqual(xml, m.build().toXML().toString());
 
         XmlPullParser parser = TestUtils.getParser(xml);
         MarkupElement parsed = new MarkupElementProvider().parse(parser);
@@ -93,7 +93,7 @@ public class MessageMarkupTest extends SmackTestSuite {
                 "</markup>";
         MarkupElement.Builder m = MarkupElement.getBuilder();
         m.setDeleted(9, 15);
-        assertXMLEqual(xml, m.build().toXML(null).toString());
+        assertXMLEqual(xml, m.build().toXML().toString());
 
         XmlPullParser parser = TestUtils.getParser(xml);
         MarkupElement parsed = new MarkupElementProvider().parse(parser);
@@ -127,7 +127,7 @@ public class MessageMarkupTest extends SmackTestSuite {
                 "</markup>";
         MarkupElement.Builder m = MarkupElement.getBuilder();
         m.setCodeBlock(23, 48);
-        assertXMLEqual(xml, m.build().toXML(null).toString());
+        assertXMLEqual(xml, m.build().toXML().toString());
 
         XmlPullParser parser = TestUtils.getParser(xml);
         MarkupElement parsed = new MarkupElementProvider().parse(parser);
@@ -157,7 +157,7 @@ public class MessageMarkupTest extends SmackTestSuite {
                 .addEntry(61, 69)
                 .addEntry(69, 89)
                 .endList();
-        assertXMLEqual(xml, m.build().toXML(null).toString());
+        assertXMLEqual(xml, m.build().toXML().toString());
 
         XmlPullParser parser = TestUtils.getParser(xml);
         MarkupElement parsed = new MarkupElementProvider().parse(parser);
@@ -186,7 +186,7 @@ public class MessageMarkupTest extends SmackTestSuite {
                 "</markup>";
         MarkupElement.Builder m = MarkupElement.getBuilder();
         m.setBlockQuote(9 ,32);
-        assertXMLEqual(xml, m.build().toXML(null).toString());
+        assertXMLEqual(xml, m.build().toXML().toString());
 
         XmlPullParser parser = TestUtils.getParser(xml);
         MarkupElement parsed = new MarkupElementProvider().parse(parser);
@@ -208,7 +208,7 @@ public class MessageMarkupTest extends SmackTestSuite {
         MarkupElement.Builder m = MarkupElement.getBuilder();
         m.setBlockQuote(0, 57);
         m.setBlockQuote(11, 34);
-        assertXMLEqual(xml, m.build().toXML(null).toString());
+        assertXMLEqual(xml, m.build().toXML().toString());
 
         XmlPullParser parser = TestUtils.getParser(xml);
         MarkupElement parsed = new MarkupElementProvider().parse(parser);

smack-experimental/src/test/java/org/jivesoftware/smackx/muclight/MUCLightConfigurationsChangeExtensionTest.java

@@ -51,7 +51,7 @@ public class MUCLightConfigurationsChangeExtensionTest {
         Assert.assertEquals("To be or not to be?", configurationsChangeExtension.getSubject());
         Assert.assertNull(configurationsChangeExtension.getRoomName());
         Assert.assertNull(configurationsChangeExtension.getCustomConfigs());
-        Assert.assertEquals(messageWithSubjectChangeExample, configurationsMessage.toXML(null).toString());
+        Assert.assertEquals(messageWithSubjectChangeExample, configurationsMessage.toXML().toString());
     }
 
     @Test
@@ -65,7 +65,7 @@ public class MUCLightConfigurationsChangeExtensionTest {
         Assert.assertEquals("A Darker Cave", configurationsChangeExtension.getRoomName());
         Assert.assertNull(configurationsChangeExtension.getSubject());
         Assert.assertNull(configurationsChangeExtension.getCustomConfigs());
-        Assert.assertEquals(messageWithRoomNameChangeExample, configurationsMessage.toXML(null).toString());
+        Assert.assertEquals(messageWithRoomNameChangeExample, configurationsMessage.toXML().toString());
     }
 
     @Test
@@ -79,7 +79,7 @@ public class MUCLightConfigurationsChangeExtensionTest {
         Assert.assertEquals("A Darker Cave", configurationsChangeExtension.getRoomName());
         Assert.assertNull(configurationsChangeExtension.getSubject());
         Assert.assertEquals("blue", configurationsChangeExtension.getCustomConfigs().get("color"));
-        Assert.assertEquals(messageWithConfigsChangeExample, configurationsMessage.toXML(null).toString());
+        Assert.assertEquals(messageWithConfigsChangeExample, configurationsMessage.toXML().toString());
     }
 
 }

smack-experimental/src/test/java/org/jivesoftware/smackx/reference/ReferenceTest.java

@@ -41,7 +41,7 @@ public class ReferenceTest extends SmackTestSuite {
                         "uri='xmpp:juliet@capulet.lit' />";
         URI uri = new URI("xmpp:juliet@capulet.lit");
         ReferenceElement element = new ReferenceElement(72, 78, ReferenceElement.Type.mention, null, uri);
-        assertXMLEqual(xml, element.toXML(null).toString());
+        assertXMLEqual(xml, element.toXML().toString());
         assertEquals(72, (int) element.getBegin());
         assertEquals(78, (int) element.getEnd());
         assertEquals(ReferenceElement.Type.mention, element.getType());
@@ -49,7 +49,7 @@ public class ReferenceTest extends SmackTestSuite {
         assertEquals(uri, element.getUri());
 
         ReferenceElement parsed = ReferenceProvider.TEST_PROVIDER.parse(TestUtils.getParser(xml));
-        assertXMLEqual(xml, parsed.toXML(null).toString());
+        assertXMLEqual(xml, parsed.toXML().toString());
     }
 
     /**
@@ -64,7 +64,7 @@ public class ReferenceTest extends SmackTestSuite {
                 "uri='xmpp:fdp.shakespeare.lit?;node=fdp/submitted/stan.isode.net/accidentreport;item=ndina872be' />";
         URI uri = new URI("xmpp:fdp.shakespeare.lit?;node=fdp/submitted/stan.isode.net/accidentreport;item=ndina872be");
         ReferenceElement element = new ReferenceElement(null, null, ReferenceElement.Type.data, null, uri);
-        assertXMLEqual(xml, element.toXML(null).toString());
+        assertXMLEqual(xml, element.toXML().toString());
 
         assertNull(element.getBegin());
         assertNull(element.getEnd());
@@ -73,7 +73,7 @@ public class ReferenceTest extends SmackTestSuite {
         assertEquals(uri, element.getUri());
 
         ReferenceElement parsed = ReferenceProvider.TEST_PROVIDER.parse(TestUtils.getParser(xml));
-        assertXMLEqual(xml, parsed.toXML(null).toString());
+        assertXMLEqual(xml, parsed.toXML().toString());
     }
 
     @Test(expected = IllegalArgumentException.class)

smack-experimental/src/test/java/org/jivesoftware/smackx/sid/StableUniqueStanzaIdTest.java

@@ -40,7 +40,7 @@ public class StableUniqueStanzaIdTest extends SmackTestSuite {
         StanzaIdElement element = new StanzaIdElement("de305d54-75b4-431b-adb2-eb6b9e546013", "alice@wonderland.lit");
         assertEquals("de305d54-75b4-431b-adb2-eb6b9e546013", element.getId());
         assertEquals("alice@wonderland.lit", element.getBy());
-        assertXMLEqual(xml, element.toXML(null).toString());
+        assertXMLEqual(xml, element.toXML().toString());
 
         StanzaIdElement parsed = StanzaIdProvider.TEST_INSTANCE.parse(TestUtils.getParser(xml));
         assertEquals(element.getId(), parsed.getId());
@@ -52,7 +52,7 @@ public class StableUniqueStanzaIdTest extends SmackTestSuite {
         String xml = "<origin-id xmlns='urn:xmpp:sid:0' id='de305d54-75b4-431b-adb2-eb6b9e546013' />";
         OriginIdElement element = new OriginIdElement("de305d54-75b4-431b-adb2-eb6b9e546013");
         assertEquals("de305d54-75b4-431b-adb2-eb6b9e546013", element.getId());
-        assertXMLEqual(xml, element.toXML(null).toString());
+        assertXMLEqual(xml, element.toXML().toString());
 
         OriginIdElement parsed = OriginIdProvider.TEST_INSTANCE.parse(TestUtils.getParser(xml));
         assertEquals(element.getId(), parsed.getId());

smack-experimental/src/test/java/org/jivesoftware/smackx/spoiler/SpoilerTest.java

@@ -46,11 +46,11 @@ public class SpoilerTest extends SmackTestSuite {
         assertNull(empty.getHint());
         assertNull(empty.getLanguage());
 
-        assertXMLEqual(xml, empty.toXML(null).toString());
+        assertXMLEqual(xml, empty.toXML().toString());
 
         XmlPullParser parser = TestUtils.getParser(xml);
         SpoilerElement parsed = SpoilerProvider.INSTANCE.parse(parser);
-        assertXMLEqual(xml, parsed.toXML(null).toString());
+        assertXMLEqual(xml, parsed.toXML().toString());
     }
 
     @Test
@@ -65,12 +65,12 @@ public class SpoilerTest extends SmackTestSuite {
         assertEquals("Love story end", withHint.getHint());
         assertNull(withHint.getLanguage());
 
-        assertXMLEqual(xml, withHint.toXML(null).toString());
+        assertXMLEqual(xml, withHint.toXML().toString());
 
         XmlPullParser parser = TestUtils.getParser(xml);
         SpoilerElement parsed = SpoilerProvider.INSTANCE.parse(parser);
 
-        assertXMLEqual(xml, parsed.toXML(null).toString());
+        assertXMLEqual(xml, parsed.toXML().toString());
     }
 
     @Test
@@ -85,13 +85,13 @@ public class SpoilerTest extends SmackTestSuite {
         assertEquals("Der Kuchen ist eine Lüge!", i18nHint.getHint());
         assertEquals("de", i18nHint.getLanguage());
 
-        assertXMLEqual(xml, i18nHint.toXML(null).toString());
+        assertXMLEqual(xml, i18nHint.toXML().toString());
 
         XmlPullParser parser = TestUtils.getParser(xml);
         SpoilerElement parsed = SpoilerProvider.INSTANCE.parse(parser);
         assertEquals(i18nHint.getLanguage(), parsed.getLanguage());
 
-        assertXMLEqual(xml, parsed.toXML(null).toString());
+        assertXMLEqual(xml, parsed.toXML().toString());
     }
 
     @Test

smack-extensions/src/main/java/org/jivesoftware/smackx/address/MultipleRecipientManager.java

@@ -211,19 +211,19 @@ public class MultipleRecipientManager {
         if (to != null) {
             for (Jid jid : to) {
                 packet.setTo(jid);
-                connection.sendStanza(new PacketCopy(packet.toXML(null)));
+                connection.sendStanza(new PacketCopy(packet.toXML()));
             }
         }
         if (cc != null) {
             for (Jid jid : cc) {
                 packet.setTo(jid);
-                connection.sendStanza(new PacketCopy(packet.toXML(null)));
+                connection.sendStanza(new PacketCopy(packet.toXML()));
             }
         }
         if (bcc != null) {
             for (Jid jid : bcc) {
                 packet.setTo(jid);
-                connection.sendStanza(new PacketCopy(packet.toXML(null)));
+                connection.sendStanza(new PacketCopy(packet.toXML()));
             }
         }
     }
@@ -309,13 +309,13 @@ public class MultipleRecipientManager {
         }
 
         @Override
-        public CharSequence toXML(String enclosingNamespace) {
+        public CharSequence toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             return text;
         }
 
         @Override
         public String toString() {
-            return toXML(null).toString();
+            return toXML().toString();
         }
 
     }

smack-extensions/src/main/java/org/jivesoftware/smackx/address/packet/MultipleAddresses.java

@@ -118,12 +118,12 @@ public class MultipleAddresses implements ExtensionElement {
     }
 
     @Override
-    public XmlStringBuilder toXML(String enclosingNamespace) {
+    public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder buf = new XmlStringBuilder(this);
         buf.rightAngleBracket();
         // Loop through all the addresses and append them to the string buffer
         for (Address address : addresses) {
-            buf.append(address.toXML(null));
+            buf.append(address.toXML());
         }
         buf.closeElement(this);
         return buf;
@@ -194,7 +194,7 @@ public class MultipleAddresses implements ExtensionElement {
         }
 
         @Override
-        public XmlStringBuilder toXML(String enclosingNamespace) {
+        public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             XmlStringBuilder buf = new XmlStringBuilder();
             buf.halfOpenElement(this).attribute("type", type);
             buf.optAttribute("jid", jid);

smack-extensions/src/main/java/org/jivesoftware/smackx/amp/packet/AMPExtension.java

@@ -154,7 +154,7 @@ public class AMPExtension implements ExtensionElement {
      * Returns the XML representation of a XHTML extension according the specification.
      **/
     @Override
-    public String toXML(String enclosingNamespace) {
+    public String toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         StringBuilder buf = new StringBuilder();
         buf.append('<').append(getElementName()).append(" xmlns=\"").append(getNamespace()).append('"');
         if (status != null) {

smack-extensions/src/main/java/org/jivesoftware/smackx/attention/packet/AttentionExtension.java

@@ -69,7 +69,7 @@ public class AttentionExtension implements ExtensionElement {
      * @see org.jivesoftware.smack.packet.PacketExtension#toXML()
      */
     @Override
-    public String toXML(String enclosingNamespace) {
+    public String toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         final StringBuilder sb = new StringBuilder();
         sb.append('<').append(getElementName()).append(" xmlns=\"").append(
                 getNamespace()).append("\"/>");

smack-extensions/src/main/java/org/jivesoftware/smackx/blocking/element/BlockedErrorExtension.java

@@ -46,7 +46,7 @@ public class BlockedErrorExtension implements ExtensionElement {
     }
 
     @Override
-    public CharSequence toXML(String enclosingNamespace) {
+    public CharSequence toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder xml = new XmlStringBuilder(this);
         xml.closeEmptyElement();
         return xml;

smack-extensions/src/main/java/org/jivesoftware/smackx/bob/element/BoBExtension.java

@@ -68,7 +68,7 @@ public class BoBExtension extends XHTMLExtension {
     }
 
     @Override
-    public XmlStringBuilder toXML(String enclosingNamespace) {
+    public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder xml = new XmlStringBuilder(this);
         xml.rightAngleBracket();
 

smack-extensions/src/main/java/org/jivesoftware/smackx/bytestreams/ibb/packet/DataPacketExtension.java

@@ -137,7 +137,7 @@ public class DataPacketExtension implements ExtensionElement {
     }
 
     @Override
-    public XmlStringBuilder toXML(String enclosingNamespace) {
+    public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder xml = getIQChildElementBuilder(new IQChildElementXmlStringBuilder(this));
         xml.closeElement(this);
         return xml;

smack-extensions/src/main/java/org/jivesoftware/smackx/bytestreams/socks5/packet/Bytestream.java

@@ -232,11 +232,11 @@ public class Bytestream extends IQ {
             xml.rightAngleBracket();
             if (getToActivate() == null) {
                 for (StreamHost streamHost : getStreamHosts()) {
-                    xml.append(streamHost.toXML(null));
+                    xml.append(streamHost.toXML());
                 }
             }
             else {
-                xml.append(getToActivate().toXML(null));
+                xml.append(getToActivate().toXML());
             }
             break;
         case result:
@@ -246,7 +246,7 @@ public class Bytestream extends IQ {
             // constructions mechanisms of Bytestream
             // A result from the server can also contain stream hosts
             for (StreamHost host : streamHosts) {
-                xml.append(host.toXML(null));
+                xml.append(host.toXML());
             }
             break;
         case get:
@@ -325,7 +325,7 @@ public class Bytestream extends IQ {
         }
 
         @Override
-        public XmlStringBuilder toXML(String enclosingNamespace) {
+        public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             XmlStringBuilder xml = new XmlStringBuilder(this);
             xml.attribute("jid", getJID());
             xml.attribute("host", getAddress());
@@ -375,7 +375,7 @@ public class Bytestream extends IQ {
         }
 
         @Override
-        public XmlStringBuilder toXML(String enclosingNamespace) {
+        public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             XmlStringBuilder xml = new XmlStringBuilder(this);
             xml.attribute("jid", getJID());
             xml.closeEmptyElement();
@@ -418,7 +418,7 @@ public class Bytestream extends IQ {
         }
 
         @Override
-        public XmlStringBuilder toXML(String enclosingNamespace) {
+        public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             XmlStringBuilder xml = new XmlStringBuilder(this);
             xml.rightAngleBracket();
             xml.escape(getTarget());

smack-extensions/src/main/java/org/jivesoftware/smackx/caps/cache/SimpleDirectoryPersistentCache.java

@@ -131,7 +131,7 @@ public class SimpleDirectoryPersistentCache implements EntityCapsPersistentCache
      */
     private static void writeInfoToFile(File file, DiscoverInfo info) throws IOException {
         try (DataOutputStream dos = new DataOutputStream(new FileOutputStream(file))) {
-            dos.writeUTF(info.toXML(null).toString());
+            dos.writeUTF(info.toXML().toString());
         }
     }
 

smack-extensions/src/main/java/org/jivesoftware/smackx/caps/packet/CapsExtension.java

@@ -69,7 +69,7 @@ public class CapsExtension implements ExtensionElement {
      *
      */
     @Override
-    public XmlStringBuilder toXML(String enclosingNamespace) {
+    public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder xml = new XmlStringBuilder(this);
         xml.attribute("hash", hash).attribute("node", node).attribute("ver", ver);
         xml.closeEmptyElement();

smack-extensions/src/main/java/org/jivesoftware/smackx/chatstates/packet/ChatStateExtension.java

@@ -59,7 +59,7 @@ public class ChatStateExtension implements ExtensionElement {
     }
 
     @Override
-    public XmlStringBuilder toXML(String enclosingNamespace) {
+    public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder xml = new XmlStringBuilder(this);
         xml.closeEmptyElement();
         return xml;

smack-extensions/src/main/java/org/jivesoftware/smackx/commands/packet/AdHocCommandData.java

@@ -95,7 +95,7 @@ public class AdHocCommandData extends IQ {
         }
 
         if (form != null) {
-            xml.append(form.toXML(null));
+            xml.append(form.toXML());
         }
 
         for (AdHocCommandNote note : notes) {
@@ -264,7 +264,7 @@ public class AdHocCommandData extends IQ {
         }
 
         @Override
-        public String toXML(String enclosingNamespace) {
+        public String toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             StringBuilder buf = new StringBuilder();
             buf.append('<').append(getElementName());
             buf.append(" xmlns=\"").append(getNamespace()).append("\"/>");

smack-extensions/src/main/java/org/jivesoftware/smackx/delay/packet/DelayInformation.java

@@ -102,7 +102,7 @@ public class DelayInformation implements ExtensionElement {
     }
 
     @Override
-    public XmlStringBuilder toXML(String enclosingNamespace) {
+    public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder xml = new XmlStringBuilder(this);
         xml.attribute("stamp", XmppDateTime.formatXEP0082Date(stamp));
         xml.optAttribute("from", from);

smack-extensions/src/main/java/org/jivesoftware/smackx/forward/packet/Forwarded.java

@@ -71,7 +71,7 @@ public class Forwarded implements ExtensionElement {
     }
 
     @Override
-    public XmlStringBuilder toXML(String enclosingNamespace) {
+    public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder xml = new XmlStringBuilder(this);
         xml.rightAngleBracket();
         xml.optElement(getDelayInformation());

smack-extensions/src/main/java/org/jivesoftware/smackx/geoloc/packet/GeoLocation.java

@@ -214,7 +214,7 @@ public final class GeoLocation implements Serializable, ExtensionElement {
     }
 
     @Override
-    public CharSequence toXML(String enclosingNamespace) {
+    public CharSequence toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder xml = new XmlStringBuilder(this);
         xml.rightAngleBracket();
         xml.optElement("accuracy", accuracy);

smack-extensions/src/main/java/org/jivesoftware/smackx/iqregister/packet/Registration.java

@@ -115,7 +115,7 @@ public class Registration extends IQ {
         }
 
         @Override
-        public CharSequence toXML(String enclosingNamespace) {
+        public CharSequence toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
             return '<' + ELEMENT + " xmlns='" + NAMESPACE + "'/>";
         }
 

smack-extensions/src/main/java/org/jivesoftware/smackx/jingle/element/JingleContent.java

@@ -132,7 +132,7 @@ public final class JingleContent implements NamedElement {
     }
 
     @Override
-    public XmlStringBuilder toXML(String enclosingNamespace) {
+    public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder xml = new XmlStringBuilder(this);
         xml.attribute(CREATOR_ATTRIBUTE_NAME, creator);
         xml.optAttribute(DISPOSITION_ATTRIBUTE_NAME, disposition);

smack-extensions/src/main/java/org/jivesoftware/smackx/jingle/element/JingleContentDescription.java

@@ -56,7 +56,7 @@ public abstract class JingleContentDescription implements ExtensionElement {
     }
 
     @Override
-    public XmlStringBuilder toXML(String enclosingNamespace) {
+    public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder xml = new XmlStringBuilder(this);
         addExtraAttributes(xml);
         xml.rightAngleBracket();

smack-extensions/src/main/java/org/jivesoftware/smackx/jingle/element/JingleContentTransport.java

@@ -66,7 +66,7 @@ public abstract class JingleContentTransport implements ExtensionElement {
     }
 
     @Override
-    public XmlStringBuilder toXML(String enclosingNamespace) {
+    public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
         XmlStringBuilder xml = new XmlStringBuilder(this);
         addExtraAttributes(xml);