iq-auth.xsd

<?xml version='1.0' encoding='UTF-8'?>

<xs:schema
    xmlns:xs='http://www.w3.org/2001/XMLSchema'
    targetNamespace='jabber:iq:auth'
    xmlns='jabber:iq:auth'
    elementFormDefault='qualified'>

  <xs:annotation>
    <xs:documentation>
      NOTE WELL: Non-SASL Authentication via the jabber:iq:auth
      protocol has been superseded by SASL Authentication as 
      defined in RFC 3920, and is now obsolete.

      For historical purposes, the protocol documented by this 
      schema is defined in XEP-0078: 

      https://xmpp.org/extensions/xep-0078.html
    </xs:documentation>
  </xs:annotation>

  <xs:element name='query'>
    <xs:complexType>
      <xs:sequence>
        <xs:element name='username' type='xs:string' minOccurs='0'/>
        <xs:choice>
          <xs:element name='password' type='xs:string' minOccurs='0'/>
          <xs:element name='digest' type='xs:string' minOccurs='0'/>
        </xs:choice>
        <xs:element name='resource' type='xs:string' minOccurs='0'/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>

</xs:schema>