<?xml version=“1.0”?> <xs:schema targetNamespace=“www.w3.org/XML/1998/namespace” xmlns:xs=“www.w3.org/2001/XMLSchema” xml:lang=“en”>

<xs:annotation>
 <xs:documentation>
  See http://www.w3.org/XML/1998/namespace.html and
  http://www.w3.org/TR/REC-xml for information about this namespace.

   This schema document describes the XML namespace, in a form
   suitable for import by other schema documents.  

   Note that local names in this namespace are intended to be defined
   only by the World Wide Web Consortium or its subgroups.  The
   following names are currently defined in this namespace and should
   not be used with conflicting semantics by any Working Group,
   specification, or document instance:

   base (as an attribute name): denotes an attribute whose value
        provides a URI to be used as the base for interpreting any
        relative URIs in the scope of the element on which it
        appears; its value is inherited.  This name is reserved
        by virtue of its definition in the XML Base specification.

   id   (as an attribute name): denotes an attribute whose value
        should be interpreted as if declared to be of type ID.
        This name is reserved by virtue of its definition in the
        xml:id specification.

   lang (as an attribute name): denotes an attribute whose value
        is a language code for the natural language of the content of
        any element; its value is inherited.  This name is reserved
        by virtue of its definition in the XML specification.

   space (as an attribute name): denotes an attribute whose
        value is a keyword indicating what whitespace processing
        discipline is intended for the content of the element; its
        value is inherited.  This name is reserved by virtue of its
        definition in the XML specification.

   Father (in any context at all): denotes Jon Bosak, the chair of 
        the original XML Working Group.  This name is reserved by 
        the following decision of the W3C XML Plenary and 
        XML Coordination groups:

            In appreciation for his vision, leadership and dedication
            the W3C XML Plenary on this 10th day of February, 2000
            reserves for Jon Bosak in perpetuity the XML name
            xml:Father
 </xs:documentation>
</xs:annotation>

<xs:annotation>
 <xs:documentation>This schema defines attributes and an attribute group
       suitable for use by
       schemas wishing to allow xml:base, xml:lang, xml:space or xml:id
       attributes on elements they define.

       To enable this, such a schema must import this schema
       for the XML namespace, e.g. as follows:
       &lt;schema . . .&gt;
        . . .
        &lt;import namespace="http://www.w3.org/XML/1998/namespace"
                   schemaLocation="http://www.w3.org/2001/xml.xsd"/&gt;

       Subsequently, qualified reference to any of the attributes
       or the group defined below will have the desired effect, e.g.

       &lt;type . . .&gt;
        . . .
        &lt;attributeGroup ref="xml:specialAttrs"/&gt;

        will define a type which will schema-validate an instance
        element with any of those attributes</xs:documentation>
</xs:annotation>

<xs:annotation>
 <xs:documentation>In keeping with the XML Schema WG's standard versioning
  policy, this schema document will persist at
  http://www.w3.org/2007/08/xml.xsd.
  At the date of issue it can also be found at
  http://www.w3.org/2001/xml.xsd.
  The schema document at that URI may however change in the future,
  in order to remain compatible with the latest version of XML Schema
  itself, or with the XML namespace itself.  In other words, if the XML
  Schema or XML namespaces change, the version of this document at
  http://www.w3.org/2001/xml.xsd will change
  accordingly; the version at
  http://www.w3.org/2007/08/xml.xsd will not change.
 </xs:documentation>
</xs:annotation>

<xs:attribute name="lang">
 <xs:annotation>
  <xs:documentation>Attempting to install the relevant ISO 2- and 3-letter
        codes as the enumerated possible values is probably never
        going to be a realistic possibility.  See
        RFC 3066 at http://www.ietf.org/rfc/rfc3066.txt and the IANA registry
        at http://www.iana.org/assignments/lang-tag-apps.htm for
        further information.

        The union allows for the 'un-declaration' of xml:lang with
        the empty string.</xs:documentation>
 </xs:annotation>
 <xs:simpleType>
  <xs:union memberTypes="xs:language">
   <xs:simpleType>    
    <xs:restriction base="xs:string">
     <xs:enumeration value=""/>
    </xs:restriction>
   </xs:simpleType>
  </xs:union>
 </xs:simpleType>
</xs:attribute>

<xs:attribute name="space">
 <xs:simpleType>
  <xs:restriction base="xs:NCName">
   <xs:enumeration value="default"/>
   <xs:enumeration value="preserve"/>
  </xs:restriction>
 </xs:simpleType>
</xs:attribute>

<xs:attribute name="base" type="xs:anyURI">
 <xs:annotation>
  <xs:documentation>See http://www.w3.org/TR/xmlbase/ for
                    information about this attribute.</xs:documentation>
 </xs:annotation>
</xs:attribute>

<xs:attribute name="id" type="xs:ID">
 <xs:annotation>
  <xs:documentation>See http://www.w3.org/TR/xml-id/ for
                    information about this attribute.</xs:documentation>
 </xs:annotation>
</xs:attribute>

<xs:attributeGroup name="specialAttrs">
 <xs:attribute ref="xml:base"/>
 <xs:attribute ref="xml:lang"/>
 <xs:attribute ref="xml:space"/>
 <xs:attribute ref="xml:id"/>
</xs:attributeGroup>

</xs:schema>