Saxon

<?xml version="1.0"?>

<xs:schema targetNamespace="http://www.w3.org/XML/1998/namespace" xmlns:xs="http://www.w3.org/2001/XMLSchema" xml:lang="en">

<xs:annotation>

<xs:documentation>

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.

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.

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

</xs:documentation>

</xs:annotation>

<xs:annotation>

<xs:documentation>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:

&lt;schema . . .&gt;

. . .

&lt;import namespace="http://www.w3.org/XML/1998/namespace"

schemaLocation="http://www.w3.org/2001/xml.xsd"/&gt;

Subsequently, qualified reference to any of the attributes

or the group defined below will have the desired effect, e.g.

&lt;type . . .&gt;

. . .

&lt;attributeGroup ref="xml:specialAttrs"/&gt;

will define a type which will schema-validate an instance

element with any of those attributes</xs:documentation>

</xs:annotation>

<xs:annotation>

<xs:documentation>In keeping with the XML Schema WG's standard versioning

policy, this schema document will persist at

http://www.w3.org/2007/08/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/2007/08/xml.xsd will not change.

</xs:documentation>

</xs:annotation>

<xs:attribute name="lang">

<xs:annotation>

<xs:documentation>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

RFC 3066 at http://www.ietf.org/rfc/rfc3066.txt and the IANA registry

at http://www.iana.org/assignments/lang-tag-apps.htm for

further information.

The union allows for the 'un-declaration' of xml:lang with

the empty string.</xs:documentation>

</xs:annotation>

<xs:simpleType>

<xs:union memberTypes="xs:language">

<xs:simpleType>

<xs:restriction base="xs:string">

<xs:enumeration value=""/>

</xs:restriction>

</xs:simpleType>

</xs:union>

</xs:simpleType>

</xs:attribute>

<xs:attribute name="space">

<xs:simpleType>

<xs:restriction base="xs:NCName">

<xs:enumeration value="default"/>

<xs:enumeration value="preserve"/>

</xs:restriction>

</xs:simpleType>

</xs:attribute>

<xs:attribute name="base" type="xs:anyURI">

<xs:annotation>

<xs:documentation>See http://www.w3.org/TR/xmlbase/ for

information about this attribute.</xs:documentation>

</xs:annotation>

</xs:attribute>

<xs:attribute name="id" type="xs:ID">

<xs:annotation>

<xs:documentation>See http://www.w3.org/TR/xml-id/ for

information about this attribute.</xs:documentation>

</xs:annotation>

</xs:attribute>

<xs:attributeGroup name="specialAttrs">

<xs:attribute ref="xml:base"/>

<xs:attribute ref="xml:lang"/>

<xs:attribute ref="xml:space"/>

<xs:attribute ref="xml:id"/>

</xs:attributeGroup>

</xs:schema>