<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
           xmlns:xi="http://www.w3.org/2001/XInclude"
           targetNamespace="http://www.w3.org/2001/XInclude"
           finalDefault="extension">
  <xs:annotation>
   <xs:documentation>
     The official XInclude XML Schema document is not normative or
     deterministic.  This schema implements only the features of
     XInclude that are used in Bcfg2 in a manner that is deterministic
     (i.e., passes XML validation).
   </xs:documentation>
  </xs:annotation>

  <xs:element name="include" type="xi:includeType" />
  <xs:complexType name="includeType" mixed="true">
    <xs:choice minOccurs="0" maxOccurs="unbounded" >
      <xs:element ref="xi:fallback" />
    </xs:choice>
    <xs:attribute name="href" use="optional" type="xs:anyURI"/>
    <xs:attribute name="parse" use="optional" default="xml"
                  type="xi:parseType" />
    <xs:attribute name="xpointer" use="optional" type="xs:string"/>
    <xs:attribute name="encoding" use="optional" type="xs:string"/>
    <xs:attribute name="accept" use="optional" type="xs:string"/>
    <xs:attribute name="accept-language" use="optional" type="xs:string"/>
  </xs:complexType>

  <xs:simpleType name="parseType">
    <xs:restriction base="xs:token">
      <xs:enumeration value="xml"/>
      <xs:enumeration value="text"/>
    </xs:restriction>
  </xs:simpleType>
  
  <xs:element name="fallback" type="xi:fallbackType" />
  <xs:complexType name="fallbackType" mixed="true">
    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <xs:element ref="xi:include"/>
    </xs:choice>
  </xs:complexType>
</xs:schema>