pie.xsd

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

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

  <xs:annotation>
    <xs:documentation>
      The protocol documented by this schema is defined in
      XEP-0227: https://xmpp.org/extensions/xep-0227.html
    </xs:documentation>
  </xs:annotation>

  <xs:element name='server-data'>
    <xs:complexType>
      <xs:sequence>
        <xs:element ref='host' maxOccurs='unbounded'/>
        <xs:any namespace='##other' minOccurs='0' maxOccurs='unbounded'/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>

  <xs:element name='host'>
    <xs:complexType>
      <xs:sequence>
	<xs:element ref='user' maxOccurs='unbounded'/>
	<xs:any namespace='##other' minOccurs='0' maxOccurs='unbounded'/>
      </xs:sequence>
      <xs:attribute name='jid' type='xs:string' use='required'/>
    </xs:complexType>
  </xs:element>

  <xs:element name='user'>
    <xs:complexType>
      <xs:sequence>
	<xs:element ref='offline-messages' minOccurs='0' maxOccurs='1'/>
	<xs:any namespace='##other' minOccurs='0' maxOccurs='unbounded'/>
      </xs:sequence>
      <xs:attribute name='name' type='xs:string' use='required'/>
      <xs:attribute name='password' type='xs:string' use='optional'/>
    </xs:complexType>
  </xs:element>

  <xs:element name='offline-messages'>
    <xs:complexType>
      <xs:sequence>
	<xs:any namespace='##other' minOccurs='0' maxOccurs='unbounded'/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>

</xs:schema>