xml.xsd

   1 <?xml version='1.0'?>
   2 <xs:schema targetNamespace="http://www.w3.org/XML/1998/namespace" xmlns:xs="http://www.w3.org/2001/XMLSchema" xml:lang="en">
   3
   4  <xs:annotation>
   5   <xs:documentation>
   6    See http://www.w3.org/XML/1998/namespace.html and
   7    http://www.w3.org/TR/REC-xml for information about this namespace.
   8
   9     This schema document describes the XML namespace, in a form
  10     suitable for import by other schema documents.
  11
  12     Note that local names in this namespace are intended to be defined
  13     only by the World Wide Web Consortium or its subgroups.  The
  14     following names are currently defined in this namespace and should
  15     not be used with conflicting semantics by any Working Group,
  16     specification, or document instance:
  17
  18     base (as an attribute name): denotes an attribute whose value
  19          provides a URI to be used as the base for interpreting any
  20          relative URIs in the scope of the element on which it
  21          appears; its value is inherited.  This name is reserved
  22          by virtue of its definition in the XML Base specification.
  23
  24     id   (as an attribute name): denotes an attribute whose value
  25          should be interpreted as if declared to be of type ID.
  26          The xml:id specification is not yet a W3C Recommendation,
  27          but this attribute is included here to facilitate experimentation
  28          with the mechanisms it proposes.  Note that it is _not_ included
  29          in the specialAttrs attribute group.
  30
  31     lang (as an attribute name): denotes an attribute whose value
  32          is a language code for the natural language of the content of
  33          any element; its value is inherited.  This name is reserved
  34          by virtue of its definition in the XML specification.
  35
  36     space (as an attribute name): denotes an attribute whose
  37          value is a keyword indicating what whitespace processing
  38          discipline is intended for the content of the element; its
  39          value is inherited.  This name is reserved by virtue of its
  40          definition in the XML specification.
  41
  42     Father (in any context at all): denotes Jon Bosak, the chair of
  43          the original XML Working Group.  This name is reserved by
  44          the following decision of the W3C XML Plenary and
  45          XML Coordination groups:
  46
  47              In appreciation for his vision, leadership and dedication
  48              the W3C XML Plenary on this 10th day of February, 2000
  49              reserves for Jon Bosak in perpetuity the XML name
  50              xml:Father
  51   </xs:documentation>
  52  </xs:annotation>
  53
  54  <xs:annotation>
  55   <xs:documentation>This schema defines attributes and an attribute group
  56         suitable for use by
  57         schemas wishing to allow xml:base, xml:lang, xml:space or xml:id
  58         attributes on elements they define.
  59
  60         To enable this, such a schema must import this schema
  61         for the XML namespace, e.g. as follows:
  62         &lt;schema . . .>
  63          . . .
  64          &lt;import namespace="http://www.w3.org/XML/1998/namespace"
  65                     schemaLocation="http://www.w3.org/2005/08/xml.xsd"/>
  66
  67         Subsequently, qualified reference to any of the attributes
  68         or the group defined below will have the desired effect, e.g.
  69
  70         &lt;type . . .>
  71          . . .
  72          &lt;attributeGroup ref="xml:specialAttrs"/>
  73
  74          will define a type which will schema-validate an instance
  75          element with any of those attributes</xs:documentation>
  76  </xs:annotation>
  77
  78  <xs:annotation>
  79   <xs:documentation>In keeping with the XML Schema WG's standard versioning
  80    policy, this schema document will persist at
  81    http://www.w3.org/2005/08/xml.xsd.
  82    At the date of issue it can also be found at
  83    http://www.w3.org/2001/xml.xsd.
  84    The schema document at that URI may however change in the future,
  85    in order to remain compatible with the latest version of XML Schema
  86    itself, or with the XML namespace itself.  In other words, if the XML
  87    Schema or XML namespaces change, the version of this document at
  88    http://www.w3.org/2001/xml.xsd will change
  89    accordingly; the version at
  90    http://www.w3.org/2005/08/xml.xsd will not change.
  91   </xs:documentation>
  92  </xs:annotation>
  93
  94  <xs:attribute name="lang">
  95   <xs:annotation>
  96    <xs:documentation>Attempting to install the relevant ISO 2- and 3-letter
  97          codes as the enumerated possible values is probably never
  98          going to be a realistic possibility.  See
  99          RFC 3066 at http://www.ietf.org/rfc/rfc3066.txt and the IANA registry
 100          at http://www.iana.org/assignments/lang-tag-apps.htm for
 101          further information.
 102
 103          The union allows for the 'un-declaration' of xml:lang with
 104          the empty string.</xs:documentation>
 105   </xs:annotation>
 106   <xs:simpleType>
 107    <xs:union memberTypes="xs:language">
 108     <xs:simpleType>
 109      <xs:restriction base="xs:string">
 110       <xs:enumeration value=""/>
 111      </xs:restriction>
 112     </xs:simpleType>
 113    </xs:union>
 114   </xs:simpleType>
 115  </xs:attribute>
 116
 117  <xs:attribute name="space">
 118   <xs:simpleType>
 119    <xs:restriction base="xs:NCName">
 120     <xs:enumeration value="default"/>
 121     <xs:enumeration value="preserve"/>
 122    </xs:restriction>
 123   </xs:simpleType>
 124  </xs:attribute>
 125
 126  <xs:attribute name="base" type="xs:anyURI">
 127   <xs:annotation>
 128    <xs:documentation>See http://www.w3.org/TR/xmlbase/ for
 129                      information about this attribute.</xs:documentation>
 130   </xs:annotation>
 131  </xs:attribute>
 132
 133  <xs:attribute name="id" type="xs:ID">
 134   <xs:annotation>
 135    <xs:documentation>See http://www.w3.org/TR/xml-id/ for
 136                      information about this attribute.</xs:documentation>
 137   </xs:annotation>
 138  </xs:attribute>
 139
 140  <xs:attributeGroup name="specialAttrs">
 141   <xs:attribute ref="xml:base"/>
 142   <xs:attribute ref="xml:lang"/>
 143   <xs:attribute ref="xml:space"/>
 144  </xs:attributeGroup>
 145
 146 </xs:schema>