sm.xsd

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

<xs:schema
    xmlns:xs='http://www.w3.org/2001/XMLSchema'
    targetNamespace='urn:xmpp:sm:3'
    xmlns='urn:xmpp:sm:3'
    elementFormDefault='qualified'>

  <xs:annotation>
    <xs:documentation>
      The protocol documented by this schema is defined in
      XEP-0198: https://xmpp.org/extensions/xep-0198.html
    </xs:documentation>
  </xs:annotation>

  <xs:import namespace='urn:ietf:params:xml:ns:xmpp-stanzas'
             schemaLocation='https://xmpp.org/schemas/stanzaerror.xsd'/>

  <xs:element name='a'>
    <xs:complexType>
      <xs:simpleContent>
        <xs:extension base='empty'>
          <xs:attribute name='h' 
                        type='xs:integer' 
                        use='required'/>
        </xs:extension>
      </xs:simpleContent>
    </xs:complexType>
  </xs:element>

  <xs:element name='enable'>
    <xs:complexType>
      <xs:simpleContent>
        <xs:extension base='empty'>
          <xs:attribute name='max' 
                        type='xs:positiveInteger' 
                        use='optional'/>
          <xs:attribute name='resume' 
                        type='xs:boolean'
                        use='optional'
                        default='false'/>
        </xs:extension>
      </xs:simpleContent>
    </xs:complexType>
  </xs:element>

  <xs:element name='enabled'>
    <xs:complexType>
      <xs:simpleContent>
        <xs:extension base='empty'>
          <xs:attribute name='id' 
                        type='xs:string'
                        use='optional'/>
          <xs:attribute name='location' 
                        type='xs:string' 
                        use='optional'/>
          <xs:attribute name='max' 
                        type='xs:positiveInteger' 
                        use='optional'/>
          <xs:attribute name='resume' 
                        type='xs:boolean'
                        use='optional'
                        default='false'/>
        </xs:extension>
      </xs:simpleContent>
    </xs:complexType>
  </xs:element>

  <xs:element name='failed'>
    <xs:complexType>
      <xs:sequence xmlns:err='urn:ietf:params:xml:ns:xmpp-stanzas' 
                   minOccurs='0'
                   maxOccurs='1'>
        <xs:group ref='err:stanzaErrorGroup'/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>

  <xs:element name='r'>
    <xs:complexType>
      <xs:simpleContent>
        <xs:extension base='empty'>
          <xs:attribute name='h' 
                        type='xs:integer' 
                        use='optional'/>
        </xs:extension>
      </xs:simpleContent>
    </xs:complexType>
  </xs:element>

  <xs:element name='resume' type='resumptionElementType'/>

  <xs:element name='resumed' type='resumptionElementType'/>

  <xs:element name='sm'>
    <xs:complexType>
      <xs:choice>
        <xs:element name='optional' type='empty'/>
        <xs:element name='required' type='empty'/>
      </xs:choice>
    </xs:complexType>
  </xs:element>

  <xs:complexType name='resumptionElementType'>
    <xs:simpleContent>
      <xs:extension base='empty'>
        <xs:attribute name='h' 
                      type='xs:unsignedInt' 
                      use='optional'/>
        <xs:attribute name='previd' 
                      type='xs:string' 
                      use='required'/>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

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

</xs:schema>