diff --git a/smack-core/src/main/java/org/jivesoftware/smack/packet/Bind.java b/smack-core/src/main/java/org/jivesoftware/smack/packet/Bind.java
index f64a29f65..6849d8231 100644
--- a/smack-core/src/main/java/org/jivesoftware/smack/packet/Bind.java
+++ b/smack-core/src/main/java/org/jivesoftware/smack/packet/Bind.java
@@ -1,6 +1,6 @@
 /**
  *
- * Copyright 2003-2007 Jive Software, 2015-2016 Florian Schmaus.
+ * Copyright 2003-2007 Jive Software, 2015-2021 Florian Schmaus.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -17,6 +17,8 @@
 
 package org.jivesoftware.smack.packet;
 
+import javax.xml.namespace.QName;
+
 import org.jxmpp.jid.EntityFullJid;
 import org.jxmpp.jid.parts.Resourcepart;
 
@@ -73,6 +75,7 @@ public final class Bind extends IQ {
 
     public static final class Feature implements ExtensionElement {
 
+        public static final QName QNAME = new QName(NAMESPACE, ELEMENT);
         public static final Feature INSTANCE = new Feature();
 
         private Feature() {
diff --git a/smack-core/src/main/java/org/jivesoftware/smack/packet/StanzaError.java b/smack-core/src/main/java/org/jivesoftware/smack/packet/StanzaError.java
index 590de8c81..5c595115b 100644
--- a/smack-core/src/main/java/org/jivesoftware/smack/packet/StanzaError.java
+++ b/smack-core/src/main/java/org/jivesoftware/smack/packet/StanzaError.java
@@ -1,6 +1,6 @@
 /**
  *
- * Copyright 2003-2007 Jive Software, 2015-2019 Florian Schmaus
+ * Copyright 2003-2007 Jive Software, 2015-2021 Florian Schmaus
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -22,6 +22,8 @@ import java.util.Locale;
 import java.util.Map;
 import java.util.logging.Logger;
 
+import javax.xml.namespace.QName;
+
 import org.jivesoftware.smack.util.Objects;
 import org.jivesoftware.smack.util.StringUtils;
 import org.jivesoftware.smack.util.XmlStringBuilder;
@@ -74,6 +76,8 @@ public class StanzaError extends AbstractError implements ExtensionElement {
 
     public static final String ERROR = "error";
 
+    public static final QName QNAME = new QName(StreamOpen.CLIENT_NAMESPACE, ERROR);
+
     private static final Logger LOGGER = Logger.getLogger(StanzaError.class.getName());
     static final Map<Condition, Type> CONDITION_TO_TYPE = new HashMap<Condition, Type>();
 
@@ -199,12 +203,12 @@ public class StanzaError extends AbstractError implements ExtensionElement {
 
     @Override
     public String getElementName() {
-        return ERROR;
+        return QNAME.getLocalPart();
     }
 
     @Override
     public String getNamespace() {
-        return StreamOpen.CLIENT_NAMESPACE;
+        return QNAME.getNamespaceURI();
     }
 
     @Override
diff --git a/smack-experimental/src/main/java/org/jivesoftware/smackx/hashes/element/HashElement.java b/smack-experimental/src/main/java/org/jivesoftware/smackx/hashes/element/HashElement.java
index 9c8329923..5a63d3f40 100644
--- a/smack-experimental/src/main/java/org/jivesoftware/smackx/hashes/element/HashElement.java
+++ b/smack-experimental/src/main/java/org/jivesoftware/smackx/hashes/element/HashElement.java
@@ -1,6 +1,6 @@
 /**
  *
- * Copyright © 2017 Paul Schaub
+ * Copyright © 2017 Paul Schaub, 2021 Florian Schmaus
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -18,6 +18,8 @@ package org.jivesoftware.smackx.hashes.element;
 
 import static org.jivesoftware.smack.util.Objects.requireNonNull;
 
+import javax.xml.namespace.QName;
+
 import org.jivesoftware.smack.packet.ExtensionElement;
 import org.jivesoftware.smack.util.XmlStringBuilder;
 import org.jivesoftware.smack.util.stringencoder.Base64;
@@ -34,6 +36,8 @@ public class HashElement implements ExtensionElement {
     public static final String ELEMENT = "hash";
     public static final String ATTR_ALGO = "algo";
 
+    public static final QName QNAME = new QName(HashManager.NAMESPACE.V2.toString(), ELEMENT);
+
     private final HashManager.ALGORITHM algorithm;
     private final byte[] hash;
     private final String hashB64;
@@ -89,7 +93,12 @@ public class HashElement implements ExtensionElement {
 
     @Override
     public String getElementName() {
-        return ELEMENT;
+        return QNAME.getLocalPart();
+    }
+
+    @Override
+    public String getNamespace() {
+        return QNAME.getNamespaceURI();
     }
 
     @Override
@@ -102,11 +111,6 @@ public class HashElement implements ExtensionElement {
         return sb;
     }
 
-    @Override
-    public String getNamespace() {
-        return HashManager.NAMESPACE.V2.toString();
-    }
-
     @Override
     public boolean equals(Object other) {
         if (other == null || !(other instanceof HashElement)) {
diff --git a/smack-experimental/src/main/java/org/jivesoftware/smackx/hoxt/packet/Base64BinaryChunk.java b/smack-experimental/src/main/java/org/jivesoftware/smackx/hoxt/packet/Base64BinaryChunk.java
index 63393a628..422d1764a 100644
--- a/smack-experimental/src/main/java/org/jivesoftware/smackx/hoxt/packet/Base64BinaryChunk.java
+++ b/smack-experimental/src/main/java/org/jivesoftware/smackx/hoxt/packet/Base64BinaryChunk.java
@@ -1,6 +1,6 @@
 /**
  *
- * Copyright 2014 Andriy Tsykholyas, 2015 Florian Schmaus
+ * Copyright 2014 Andriy Tsykholyas, 2015-2021 Florian Schmaus
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,6 +16,8 @@
  */
 package org.jivesoftware.smackx.hoxt.packet;
 
+import javax.xml.namespace.QName;
+
 import org.jivesoftware.smack.packet.ExtensionElement;
 import org.jivesoftware.smack.util.Objects;
 import org.jivesoftware.smack.util.XmlStringBuilder;
@@ -36,6 +38,8 @@ public class Base64BinaryChunk implements ExtensionElement {
     public static final String ATTRIBUTE_LAST = "last";
     public static final String ATTRIBUTE_NR = "nr";
 
+    public static final QName QNAME = new QName(HOXTManager.NAMESPACE, ELEMENT_CHUNK);
+
     private final String streamId;
     private final boolean last;
     private final String text;
@@ -108,12 +112,12 @@ public class Base64BinaryChunk implements ExtensionElement {
 
     @Override
     public String getElementName() {
-        return ELEMENT_CHUNK;
+        return QNAME.getLocalPart();
     }
 
     @Override
     public String getNamespace() {
-        return HOXTManager.NAMESPACE;
+        return QNAME.getNamespaceURI();
     }
 
     @Override
diff --git a/smack-experimental/src/main/java/org/jivesoftware/smackx/message_markup/element/BlockQuoteElement.java b/smack-experimental/src/main/java/org/jivesoftware/smackx/message_markup/element/BlockQuoteElement.java
index 7d66db83a..b576d7482 100644
--- a/smack-experimental/src/main/java/org/jivesoftware/smackx/message_markup/element/BlockQuoteElement.java
+++ b/smack-experimental/src/main/java/org/jivesoftware/smackx/message_markup/element/BlockQuoteElement.java
@@ -16,9 +16,12 @@
  */
 package org.jivesoftware.smackx.message_markup.element;
 
+import javax.xml.namespace.QName;
+
 public class BlockQuoteElement extends MarkupElement.BlockLevelMarkupElement {
 
     public static final String ELEMENT = "bquote";
+    public static final QName QNAME = new QName(MarkupElement.NAMESPACE, ELEMENT);
 
     /**
      * Create a new Block Quote element.
@@ -32,7 +35,7 @@ public class BlockQuoteElement extends MarkupElement.BlockLevelMarkupElement {
 
     @Override
     public String getElementName() {
-        return ELEMENT;
+        return QNAME.getLocalPart();
     }
 
 }
diff --git a/smack-extensions/src/main/java/org/jivesoftware/smackx/muc/packet/MUCUser.java b/smack-extensions/src/main/java/org/jivesoftware/smackx/muc/packet/MUCUser.java
index 81eda1319..d93d625da 100644
--- a/smack-extensions/src/main/java/org/jivesoftware/smackx/muc/packet/MUCUser.java
+++ b/smack-extensions/src/main/java/org/jivesoftware/smackx/muc/packet/MUCUser.java
@@ -328,6 +328,7 @@ public class MUCUser implements ExtensionElement {
      */
     public static class Decline implements ExtensionElement {
         public static final String ELEMENT = "decline";
+        public static final QName QNAME = new QName(NAMESPACE, ELEMENT);
 
         private final String reason;
         private final EntityBareJid from;
@@ -384,12 +385,12 @@ public class MUCUser implements ExtensionElement {
 
         @Override
         public String getElementName() {
-            return ELEMENT;
+            return QNAME.getLocalPart();
         }
 
         @Override
         public String getNamespace() {
-            return NAMESPACE;
+            return QNAME.getNamespaceURI();
         }
     }
 
diff --git a/smack-extensions/src/main/java/org/jivesoftware/smackx/nick/packet/Nick.java b/smack-extensions/src/main/java/org/jivesoftware/smackx/nick/packet/Nick.java
index ef95d395d..bc1bd04b4 100644
--- a/smack-extensions/src/main/java/org/jivesoftware/smackx/nick/packet/Nick.java
+++ b/smack-extensions/src/main/java/org/jivesoftware/smackx/nick/packet/Nick.java
@@ -16,6 +16,8 @@
  */
 package org.jivesoftware.smackx.nick.packet;
 
+import javax.xml.namespace.QName;
+
 import org.jivesoftware.smack.packet.ExtensionElement;
 import org.jivesoftware.smack.util.StringUtils;
 import org.jivesoftware.smack.util.XmlStringBuilder;
@@ -30,7 +32,16 @@ public class Nick implements ExtensionElement {
 
     public static final String NAMESPACE = "http://jabber.org/protocol/nick";
 
-    public static final String ELEMENT_NAME = "nick";
+    public static final QName QNAME = new QName(NAMESPACE, "nick");
+
+    /**
+     * Deprected, do not use.
+     *
+     * @deprecated use {@link #QNAME} instead.
+     */
+    @Deprecated
+    // TODO: Remove in Smack 4.6.
+    public static final String ELEMENT_NAME = QNAME.getLocalPart();
 
     private final String name;
 
@@ -49,12 +60,12 @@ public class Nick implements ExtensionElement {
 
     @Override
     public String getElementName() {
-        return ELEMENT_NAME;
+        return QNAME.getLocalPart();
     }
 
     @Override
     public String getNamespace() {
-        return NAMESPACE;
+        return QNAME.getNamespaceURI();
     }
 
     @Override
diff --git a/smack-im/src/main/java/org/jivesoftware/smack/roster/packet/RosterPacket.java b/smack-im/src/main/java/org/jivesoftware/smack/roster/packet/RosterPacket.java
index 2944cf6be..05af37297 100644
--- a/smack-im/src/main/java/org/jivesoftware/smack/roster/packet/RosterPacket.java
+++ b/smack-im/src/main/java/org/jivesoftware/smack/roster/packet/RosterPacket.java
@@ -24,6 +24,8 @@ import java.util.Locale;
 import java.util.Set;
 import java.util.concurrent.CopyOnWriteArraySet;
 
+import javax.xml.namespace.QName;
+
 import org.jivesoftware.smack.packet.ExtensionElement;
 import org.jivesoftware.smack.packet.IQ;
 import org.jivesoftware.smack.packet.Stanza;
@@ -119,6 +121,8 @@ public final class RosterPacket extends IQ {
          */
         public static final String ELEMENT = Stanza.ITEM;
 
+        public static final QName QNAME = new QName(NAMESPACE, ELEMENT);
+
         public static final String GROUP = "group";
 
         private final BareJid jid;
@@ -160,12 +164,12 @@ public final class RosterPacket extends IQ {
 
         @Override
         public String getElementName() {
-            return ELEMENT;
+            return QNAME.getLocalPart();
         }
 
         @Override
         public String getNamespace() {
-            return NAMESPACE;
+            return QNAME.getNamespaceURI();
         }
 
         /**