[xmljs-users] Namespace validation question

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Hello,

In DOMDocument.prototype._isValidNamespace (xmlw3cdom.js) on line 2928,
there is a check for the "xml" prefix:

    if ((valid) && (qName.prefix == "xml") && (namespaceURI !=
"http://www.w3.org/XML/1998/namespace")) {
   ...

Why does the namespaceURI have to be set to
"http://www.w3.org/XML/1998/namespace" if the prefix is "xml"?

This fails to validate the namespace for the xml:lang attribute in
something like the following, which to me looks perfectly valid:

<body xmlns='http://jabber.org/protocol/httpbind'>
  <iq id="set_1" to="us...@se.../res" type="error"
from="us...@se.../res">
    <tag1 xmlns="my:namespace">
      <tag2>
        <tag3 name="asfsafsf"/>
      </tag2>
    </tag1>
    <error code="502" type="CANCEL">
      <remote-server-error xmlns="urn:ietf:params:xml:ns:xmpp-stanzas"/>
      <text xmlns="urn:ietf:params:xml:ns:xmpp-stanzas" xml:lang="en"/>
    </error>
  </iq>
</body>

Doesn't the "xml" prefix by definition mean that "lang" is in the
"http://www.w3.org/XML/1998/namespace" namespace?

Thanks,
Ilya