创建节点“test1_node1”后，我将以下节发送到 ejabbers 服务器
<iq id="publish1" to="pubsub.oomaxmpp.com" type="get" from="admin@oomaxmpp.com/1697575709134613774110793">
<pubsub xmlns="http://jabber.org/protocol/pubsub">
<publish node="test_node1"><item id="qwert12345">
<entry xmlns="http://www.w3.org/2005/Atom">
<title>*publish*</title>
<summary>*1234567890*</summary>
<published>2003-12-13T18:30:02Z</published>
<updated>2003-12-13T18:30:02Z</updated>
</entry>
</item>
</publish>
</pubsub>
</iq>
但我得到以下节的错误结果，
<iq id="publish1" xml:lang="en" type="error" to="admin@oomaxmpp.com/1697575709134613774110793" from="pubsub.oomaxmpp.com">
<pubsub xmlns="http://jabber.org/protocol/pubsub"><publish node="test_node1">
<item id="qwert12345"><entry xmlns="http://www.w3.org/2005/Atom">
<title>*publish*</title>
<summary>*1234567890*</summary>
<published>2003-12-13T18:30:02Z</published>
<updated>2003-12-13T18:30:02Z</updated>
</entry>
</item>
</publish>
</pubsub>
<error code="501" type="cancel"><feature-not-implemented xmlns="urn:ietf:params:xml:ns:xmpp-stanzas"/>
</error>
</iq>
我不明白，如果功能没有实现，节点是如何创建的？为什么我不能发布？