Vocabulary modules that define element domains must define an extension pattern for each element that is extended by the domain. These patterns are used when including the domain module in a document-type shell.
All vocabulary and constraint modules must document their
@domains attribute contribution. The value of the contribution is
constructed according to the rules found in domains attribute rules and syntax. The OASIS grammar files
<domainsContribution> element to document the contribution;
this element is used to help enable generation of DTD and XSD grammar files. An XML comment
<a:documentation> element can also be used.
For each element type that is extended by the element domain module, the module must define a domain extension pattern. The pattern consists of a choice group of references to element-type name patterns, with one reference to each extension of the base element type.
<ph>element type by adding the specializations of
<ph>that are defined in the highlighting domain:
<define name="hi-d-ph"> <choice> <ref name="b.element"/> <ref name="i.element"/> <ref name="sup.element"/> <ref name="sub.element"/> <ref name="tt.element"/> <ref name="u.element"/> </choice> </define>
For each element type that is extended by the element domain module, the module extends the
element type pattern with a
@combine value of "choice" that contains a
reference to the domain extension pattern. Because the pattern uses a
value of "choice", the effect is that the domain-provided elements are automatically added to
the effective content model of the extended element in any grammar that includes the domain
<ph>element to the content model of the
<define name="ph" combine="choice"> <ref name="hi-d-ph"/> </define>
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