forward.xsd

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

<xs:schema
    xmlns:xs='http://www.w3.org/2001/XMLSchema'
    targetNamespace='urn:xmpp:forward:0'
    xmlns='urn:xmpp:forward:0'
    elementFormDefault='qualified'>

  <xs:annotation>
    <xs:documentation>
      The protocol documented by this schema is defined in
      XEP-0297: https://xmpp.org/extensions/xep-0297.html
    </xs:documentation>
  </xs:annotation>

  <xs:import namespace='jabber:client'
             schemaLocation='https://xmpp.org/schemas/jabber-client.xsd'/>
  <xs:import namespace='jabber:server'
             schemaLocation='https://xmpp.org/schemas/jabber-server.xsd'/>
  <xs:import namespace='urn:xmpp:delay'
             schemaLocation='https://xmpp.org/schemas/delay.xsd'/>

  <xs:element name='forwarded'>
    <xs:complexType>
      <xs:sequence xmlns:delay='urn:xmpp:delay'
                   xmlns:client='jabber:client'
                   xmlns:server='jabber:server'>
        <xs:element ref='delay:delay' minOccurs='0' maxOccurs='1' />
        <xs:choice minOccurs='0' maxOccurs='1'>
          <xs:choice>
            <xs:element ref='client:message'/>
            <xs:element ref='client:presence'/>
            <xs:element ref='client:iq'/>
          </xs:choice>
          <xs:choice>
            <xs:element ref='server:message'/>
            <xs:element ref='server:presence'/>
            <xs:element ref='server:iq'/>
          </xs:choice>
        </xs:choice>
      </xs:sequence>
    </xs:complexType>
  </xs:element>

</xs:schema>