+
+ About the XML namespace
+ +
+
+ + This schema document describes the XML namespace, in a form + suitable for import by other schema documents. +
++ See + http://www.w3.org/XML/1998/namespace.html and + + http://www.w3.org/TR/REC-xml for information + about this namespace. +
++ Note that local names in this namespace are intended to be + defined only by the World Wide Web Consortium or its subgroups. + The names currently defined in this namespace are listed below. + They should not be used with conflicting semantics by any Working + Group, specification, or document instance. +
++ See further below in this document for more information about how to refer to this schema document from your own + XSD schema documents and about the + namespace-versioning policy governing this schema document. +
+
+
+
+ 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.
+ +
+
+ Notes
++ 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 BCP 47 at + http://www.rfc-editor.org/rfc/bcp/bcp47.txt + and the IANA language subtag registry at + + http://www.iana.org/assignments/language-subtag-registry + for further information. +
++ The union allows for the 'un-declaration' of xml:lang with + the empty string. +
+
+
+
+ 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.
+ +
+
+
+ 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.
+ ++ See http://www.w3.org/TR/xmlbase/ + for information about this attribute. +
+
+
+
+ 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.
+ ++ See http://www.w3.org/TR/xml-id/ + for information about this attribute. +
+
+
+
+ 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". +
+
+
+ About this schema document
+ +
+
+
+ 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"/> ++
+ or +
++ <import namespace="http://www.w3.org/XML/1998/namespace" + schemaLocation="http://www.w3.org/2009/01/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. +
+
+
+ Versioning policy for this schema document
+
+
+ + In keeping with the XML Schema WG's standard versioning + policy, this schema document will persist at + + http://www.w3.org/2009/01/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/2009/01/xml.xsd + + will not change. +
++ Previous dated (and unchanging) versions of this schema + document are at: +
+ +