The <index-base> element allows indexing extensions to be added by specializing this element.

The <index-base> element can only exist as a child of an <indexterm> element. This characteristic makes it the appropriate element to specialize to add indexing extensions. For example, the <index-see>, <index-see-also>, and <index-sort-as> elements only make sense as children of <indexterm> and so are specializations of <index-base>. Those elements are all part of the indexing domain.

On its own, <index-base> has no meaning. Processors should ignore this element and its content if encountered in its unspecialized form.

Content models

See appendix for information about this element in OASIS document type shells.


- topic/index-base


The <index-see-also> element is specialized from <index-base>; see index-see-also for an example of how <index-base> can be used with specialization.


The following attributes are available on this element: Universal attribute group and @keyref.