disco-info.xsd

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

<xs:schema
    xmlns:xs='http://www.w3.org/2001/XMLSchema'
    targetNamespace='http://jabber.org/protocol/disco#info'
    xmlns='http://jabber.org/protocol/disco#info'
    elementFormDefault='qualified'>

  <xs:annotation>
    <xs:documentation>
      The protocol documented by this schema is defined in
      XEP-0030: https://xmpp.org/extensions/xep-0030.html
    </xs:documentation>
  </xs:annotation>

  <xs:element name='query'>
    <xs:complexType>
      <xs:sequence minOccurs='0'>
        <xs:element ref='identity' maxOccurs='unbounded'/>
        <xs:element ref='feature' maxOccurs='unbounded'/>
      </xs:sequence>
      <xs:attribute name='node' type='xs:string' use='optional'/>
    </xs:complexType>
  </xs:element>

  <xs:element name='identity'>
    <xs:complexType>
      <xs:simpleContent>
        <xs:extension base='empty'>
          <xs:attribute name='category' type='nonEmptyString' use='required'/>
          <xs:attribute name='name' type='xs:string' use='optional'/>
          <xs:attribute name='type' type='nonEmptyString' use='required'/>
        </xs:extension>
      </xs:simpleContent>
    </xs:complexType>
  </xs:element>

  <xs:element name='feature'>
    <xs:complexType>
      <xs:simpleContent>
        <xs:extension base='empty'>
          <xs:attribute name='var' type='xs:string' use='required'/>
        </xs:extension>
      </xs:simpleContent>
    </xs:complexType>
  </xs:element>

  <xs:simpleType name='nonEmptyString'>
    <xs:restriction base='xs:string'>
      <xs:minLength value='1'/>
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name='empty'>
    <xs:restriction base='xs:string'>
      <xs:enumeration value=''/>
    </xs:restriction>
  </xs:simpleType>

</xs:schema>