Submitted URL: http://www.w3.org/XML/1998/namespace
Effective URL: https://www.w3.org/XML/1998/namespace
Submission: On September 07 via api from US

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The "xml:" Namespace 
The "xml:" Namespace
This Version:
26 October 2009
The namespace whose name is
http://www.w3.org/XML/1998/namespace is bound by definition to
the prefix xml: according to  
Namespaces in XML (and by Namespaces in XML 1.1).
Note that unlike all other XML namespaces, both the name and
the prefix are specified; 
i.e., if you want XML 1.0 processors to recognize this namespace, you must use
the reserved prefix xml:.
xml:lang and xml:space
As of the last update of this document, the 
XML 1.0 Specification (Fifth edition)
(and also the XML 1.1 Specification
Second edition)
defines two attribute names in this namespace:
Designed for identifying
the human language used in the scope of the element to which it's
Designed to express whether or not the document's creator wishes white
space to be considered as significant in the scope of the element to which
it's attached.
The XML Base specification
(Second edition)
describes a facility, similar to that of HTML BASE, for defining base URIs for
parts of XML documents.
It defines a single attribute, xml:base, and describes in
detail the procedure for its use in processing relative URI refeferences.
The xml:id specification defines
a single attribute, xml:id, known to be of type ID
independently of any DTD or schema.
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".
Namespace change policy
The XML Core Working
reserves the right to
bring additional names from this namespace into active use by
providing definitions for them in new specifications or
subsequent editions of existing specifications.  The Working
Group may also make modifications to the definitions of the
names already in use, although such changes will not normally
change the well-formedness or validity of existing documents
or significantly change their meaning.
All changes to the use of this namespace will be achieved by
the publication of documents governed by the W3C Process.
Other names beginning 'xml'
The XML specification
reserves all names beginning with the letters 'x', 'm', 'l' in any combination
of upper- and lower-case for use by the W3C.  To date three such names have
been given definitions—although these names are not in the XML
namespace, they are listed here as a convenience to readers and users:
See the XML declaration and the XML namespace prefix
See namespace declarations
See The xml-stylesheet processing instruction
Related Resources
2.10 of the XML 1.0 specification describes the syntax and semantics of
the xml:space attribute.
2.12 of the XML 1.0 specification describes the syntax and semantics of
the xml:lang attribute.
An XML Schema
is available which constrains the syntax of xml:lang, xml:space,
xml:base and xml:id in the schema language defined by the XML Schema Recommendation, Second Edition,
of 28 October 2004.
(An XML Schema
for the CR version
of XML Schema is still available as well.)
The value of the xml:lang attribute must be as specified
by BCP 47,
or be empty.
The W3C XML Base
specification for the xml:base attribute.
The W3C xml:id
specification for the xml:id attribute.