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