<?xml version="1.0"?>

<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.

         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:

        <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/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>