Smack/smack-im/src/main/resources/org.jivesoftware.smack.im/smackim.providers

<?xml version="1.0"?> 
<smackProviders>

    <!-- RFC-6121: Extensible Messaging and Presence Protocol (XMPP): Instant Messaging and Presence -->
    <iqProvider>
        <elementName>query</elementName>
        <namespace>jabber:iq:roster</namespace>
        <className>org.jivesoftware.smack.roster.provider.RosterPacketProvider</className>
    </iqProvider>
    <streamFeatureProvider>
        <elementName>sub</elementName>
        <namespace>urn:xmpp:features:pre-approval</namespace>
        <className>org.jivesoftware.smack.roster.provider.SubscriptionPreApprovalStreamFeatureProvider</className>
    </streamFeatureProvider>

    <!-- XEP-0237: Roster Versioning -->
    <streamFeatureProvider>
        <elementName>ver</elementName>
        <namespace>urn:xmpp:features:rosterver</namespace>
        <className>org.jivesoftware.smack.roster.provider.RosterVerStreamFeatureProvider</className>
    </streamFeatureProvider>

</smackProviders>