15 | This schema document describes the XML namespace, in a form 16 | suitable for import by other schema documents. 17 |
18 |19 | See 20 | http://www.w3.org/XML/1998/namespace.html and 21 | 22 | http://www.w3.org/TR/REC-xml for information 23 | about this namespace. 24 |
25 |26 | Note that local names in this namespace are intended to be 27 | defined only by the World Wide Web Consortium or its subgroups. 28 | The names currently defined in this namespace are listed below. 29 | They should not be used with conflicting semantics by any Working 30 | Group, specification, or document instance. 31 |
32 |33 | See further below in this document for more information about how to refer to this schema document from your own 35 | XSD schema documents and about the 36 | namespace-versioning policy governing this schema document. 37 |
38 |50 | denotes an attribute whose value 51 | is a language code for the natural language of the content of 52 | any element; its value is inherited. This name is reserved 53 | by virtue of its definition in the XML specification.
54 | 55 |59 | Attempting to install the relevant ISO 2- and 3-letter 60 | codes as the enumerated possible values is probably never 61 | going to be a realistic possibility. 62 |
63 |64 | See BCP 47 at 65 | http://www.rfc-editor.org/rfc/bcp/bcp47.txt 66 | and the IANA language subtag registry at 67 | 68 | http://www.iana.org/assignments/language-subtag-registry 69 | for further information. 70 |
71 |72 | The union allows for the 'un-declaration' of xml:lang with 73 | the empty string. 74 |
75 |96 | denotes an attribute whose 97 | value is a keyword indicating what whitespace processing 98 | discipline is intended for the content of the element; its 99 | value is inherited. This name is reserved by virtue of its 100 | definition in the XML specification.
101 | 102 |119 | denotes an attribute whose value 120 | provides a URI to be used as the base for interpreting any 121 | relative URIs in the scope of the element on which it 122 | appears; its value is inherited. This name is reserved 123 | by virtue of its definition in the XML Base specification.
124 | 125 |126 | See http://www.w3.org/TR/xmlbase/ 128 | for information about this attribute. 129 |
130 |142 | denotes an attribute whose value 143 | should be interpreted as if declared to be of type ID. 144 | This name is reserved by virtue of its definition in the 145 | xml:id specification.
146 | 147 |148 | See http://www.w3.org/TR/xml-id/ 150 | for information about this attribute. 151 |
152 |172 | denotes Jon Bosak, the chair of 173 | the original XML Working Group. This name is reserved by 174 | the following decision of the W3C XML Plenary and 175 | XML Coordination groups: 176 |
177 |178 |185 |179 | In appreciation for his vision, leadership and 180 | dedication the W3C XML Plenary on this 10th day of 181 | February, 2000, reserves for Jon Bosak in perpetuity 182 | the XML name "xml:Father". 183 |
184 |
197 | This schema defines attributes and an attribute group suitable
198 | for use by schemas wishing to allow xml:base
,
199 | xml:lang
, xml:space
or
200 | xml:id
attributes on elements they define.
201 |
203 | To enable this, such a schema must import this schema for 204 | the XML namespace, e.g. as follows: 205 |
206 |207 | <schema . . .> 208 | . . . 209 | <import namespace="http://www.w3.org/XML/1998/namespace" 210 | schemaLocation="http://www.w3.org/2001/xml.xsd"/> 211 |212 |
213 | or 214 |
215 |216 | <import namespace="http://www.w3.org/XML/1998/namespace" 217 | schemaLocation="http://www.w3.org/2009/01/xml.xsd"/> 218 |219 |
220 | Subsequently, qualified reference to any of the attributes or the 221 | group defined below will have the desired effect, e.g. 222 |
223 |224 | <type . . .> 225 | . . . 226 | <attributeGroup ref="xml:specialAttrs"/> 227 |228 |
229 | will define a type which will schema-validate an instance element 230 | with any of those attributes. 231 |
232 |243 | In keeping with the XML Schema WG's standard versioning 244 | policy, this schema document will persist at 245 | 246 | http://www.w3.org/2009/01/xml.xsd. 247 |
248 |249 | At the date of issue it can also be found at 250 | 251 | http://www.w3.org/2001/xml.xsd. 252 |
253 |254 | The schema document at that URI may however change in the future, 255 | in order to remain compatible with the latest version of XML 256 | Schema itself, or with the XML namespace itself. In other words, 257 | if the XML Schema or XML namespaces change, the version of this 258 | document at 259 | http://www.w3.org/2001/xml.xsd 260 | 261 | will change accordingly; the version at 262 | 263 | http://www.w3.org/2009/01/xml.xsd 264 | 265 | will not change. 266 |
267 |268 | Previous dated (and unchanging) versions of this schema 269 | document are at: 270 |
271 | 281 |