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xml.rnc
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xml.rnc
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namespace a = "http://relaxng.org/ns/compatibility/annotations/1.0"
namespace rng = "http://relaxng.org/ns/structure/1.0"
## See http://www.w3.org/XML/1998/namespace.html and
## http://www.w3.org/TR/REC-xml for information about this namespace.
## This schema document describes the XML namespace, in a form
## suitable for import by other schema documents.
## Note that local names in this namespace are intended to be defined
## only by the World Wide Web Consortium or its subgroups. The
## following names are currently defined in this namespace and should
## not be used with conflicting semantics by any Working Group,
## specification, or document instance:
## 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.
## 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.
## 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.
## 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
## This schema defines attributes and an attribute group
## suitable for use by
## schemas wishing to allow xml:base, xml:lang or xml:space 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/2001/03/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
## In keeping with the XML Schema WG's standard versioning
## policy, this schema document will persist at
## http://www.w3.org/2001/03/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. In other words, if the XML Schema namespace changes, the version
## of this document at
## http://www.w3.org/2001/xml.xsd will change
## accordingly; the version at
## http://www.w3.org/2001/03/xml.xsd will not change.
attr_lang =
attribute lang {
## In due course, we should install the relevant ISO 2- and 3-letter
## codes as the enumerated possible values . . .
xsd:language}?
attr_space =
[ a:defaultValue = "preserve" ]
attribute space {"default" | "preserve"}?
attr_base =
attribute base {
## See http://www.w3.org/TR/xmlbase/ for
## information about this attribute.
xsd:anyURI}?
specialAttrs = attr_base, attr_lang, attr_space