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.
The union allows for the 'un-declaration' of xml:lang with
the empty string.
Source
<xs:attributeGroup name="titleAttrs"><xs:attribute ref="xlink:type" fixed="title" use="required"/><xs:attribute ref="xml:lang"><xs:annotation><xs:documentation>xml:lang is not required, but provides much of the motivation for title elements in addition to attributes, and so is provided here for convenience.</xs:documentation></xs:annotation></xs:attribute></xs:attributeGroup>
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