protected boolean isStreamManagementStanza(Element stanza) {
        return StreamManager.NAMESPACE_V2.equals(stanza.getNamespace().getStringValue()) ||
                StreamManager.NAMESPACE_V3.equals(stanza.getNamespace().getStringValue());
    }
Determines whether stanza's namespace matches XEP-0198 namespace
@param stanza Stanza to be checked
@return whether stanza's namespace matches XEP-0198 namespace
xmppserver/src/main/java/org/jivesoftware/openfire/net/StanzaHandler.java