<?xml version="1.0"?>

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 <xs:schema targetNamespace="http://www.w3.org/XML/1998/namespace" xmlns:xs="http://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.

          The xml:id specification is not yet a W3C Recommendation,

          but this attribute is included here to facilitate experimentation

          with the mechanisms it proposes.  Note that it is _not_ included

          in the specialAttrs attribute group.

     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:

         <schema . . .>

          . . .

          <import namespace="http://www.w3.org/XML/1998/namespace"

                     schemaLocation="http://www.w3.org/2001/xml.xsd"/>

         Subsequently, qualified reference to any of the attributes

         or the group defined below will have the desired effect, e.g.

         <type . . .>

          . . .

          <attributeGroup ref="xml:specialAttrs"/>

          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/2005/08/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/2005/08/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:attributeGroup>

 </xs:schema>