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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 This name is reserved by virtue of its definition in the |
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27 xml:id specification. |
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28 |
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29 lang (as an attribute name): denotes an attribute whose value |
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30 is a language code for the natural language of the content of |
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31 any element; its value is inherited. This name is reserved |
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32 by virtue of its definition in the XML specification. |
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33 |
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34 space (as an attribute name): denotes an attribute whose |
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35 value is a keyword indicating what whitespace processing |
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36 discipline is intended for the content of the element; its |
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37 value is inherited. This name is reserved by virtue of its |
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38 definition in the XML specification. |
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39 |
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40 Father (in any context at all): denotes Jon Bosak, the chair of |
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41 the original XML Working Group. This name is reserved by |
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42 the following decision of the W3C XML Plenary and |
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43 XML Coordination groups: |
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44 |
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45 In appreciation for his vision, leadership and dedication |
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46 the W3C XML Plenary on this 10th day of February, 2000 |
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47 reserves for Jon Bosak in perpetuity the XML name |
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48 xml:Father |
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49 </xs:documentation> |
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50 </xs:annotation> |
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51 |
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52 <xs:annotation> |
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53 <xs:documentation>This schema defines attributes and an attribute group |
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54 suitable for use by |
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55 schemas wishing to allow xml:base, xml:lang, xml:space or xml:id |
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56 attributes on elements they define. |
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57 |
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58 To enable this, such a schema must import this schema |
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59 for the XML namespace, e.g. as follows: |
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60 <schema . . .> |
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61 . . . |
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62 <import namespace="http://www.w3.org/XML/1998/namespace" |
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63 schemaLocation="http://www.w3.org/2001/xml.xsd"/> |
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64 |
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65 Subsequently, qualified reference to any of the attributes |
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66 or the group defined below will have the desired effect, e.g. |
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67 |
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68 <type . . .> |
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69 . . . |
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70 <attributeGroup ref="xml:specialAttrs"/> |
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71 |
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72 will define a type which will schema-validate an instance |
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73 element with any of those attributes</xs:documentation> |
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74 </xs:annotation> |
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75 |
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76 <xs:annotation> |
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77 <xs:documentation>In keeping with the XML Schema WG's standard versioning |
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78 policy, this schema document will persist at |
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79 http://www.w3.org/2007/08/xml.xsd. |
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80 At the date of issue it can also be found at |
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81 http://www.w3.org/2001/xml.xsd. |
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82 The schema document at that URI may however change in the future, |
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83 in order to remain compatible with the latest version of XML Schema |
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84 itself, or with the XML namespace itself. In other words, if the XML |
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85 Schema or XML namespaces change, the version of this document at |
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86 http://www.w3.org/2001/xml.xsd will change |
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87 accordingly; the version at |
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88 http://www.w3.org/2007/08/xml.xsd will not change. |
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89 </xs:documentation> |
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90 </xs:annotation> |
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91 |
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92 <xs:attribute name="lang"> |
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93 <xs:annotation> |
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94 <xs:documentation>Attempting to install the relevant ISO 2- and 3-letter |
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95 codes as the enumerated possible values is probably never |
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96 going to be a realistic possibility. See |
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97 RFC 3066 at http://www.ietf.org/rfc/rfc3066.txt and the IANA registry |
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98 at http://www.iana.org/assignments/lang-tag-apps.htm for |
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99 further information. |
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100 |
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101 The union allows for the 'un-declaration' of xml:lang with |
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102 the empty string.</xs:documentation> |
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103 </xs:annotation> |
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104 <xs:simpleType> |
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105 <xs:union memberTypes="xs:language"> |
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106 <xs:simpleType> |
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107 <xs:restriction base="xs:string"> |
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108 <xs:enumeration value=""/> |
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109 </xs:restriction> |
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110 </xs:simpleType> |
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111 </xs:union> |
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112 </xs:simpleType> |
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113 </xs:attribute> |
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114 |
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115 <xs:attribute name="space"> |
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116 <xs:simpleType> |
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117 <xs:restriction base="xs:NCName"> |
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118 <xs:enumeration value="default"/> |
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119 <xs:enumeration value="preserve"/> |
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120 </xs:restriction> |
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121 </xs:simpleType> |
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122 </xs:attribute> |
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123 |
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124 <xs:attribute name="base" type="xs:anyURI"> |
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125 <xs:annotation> |
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126 <xs:documentation>See http://www.w3.org/TR/xmlbase/ for |
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127 information about this attribute.</xs:documentation> |
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128 </xs:annotation> |
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129 </xs:attribute> |
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130 |
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131 <xs:attribute name="id" type="xs:ID"> |
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132 <xs:annotation> |
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133 <xs:documentation>See http://www.w3.org/TR/xml-id/ for |
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134 information about this attribute.</xs:documentation> |
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135 </xs:annotation> |
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136 </xs:attribute> |
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137 |
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138 <xs:attributeGroup name="specialAttrs"> |
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139 <xs:attribute ref="xml:base"/> |
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140 <xs:attribute ref="xml:lang"/> |
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141 <xs:attribute ref="xml:space"/> |
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142 <xs:attribute ref="xml:id"/> |
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143 </xs:attributeGroup> |
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144 |
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145 </xs:schema> |