An <indexterm> is an index entry. You can nest entries to create multi-level indexes. The content is not output as part of topic content, only as part of the index.
When DITA topics are output to XHTML, any indexterm elements in the <keywords> element are placed in the Web page metadata, in addition to becoming part of the generated index.
|Name||Description||Data Type||Default Value||Required?|
|keyref||Currently not implemented in DITA processors. Provides a key that a process can use to identify a higher-level index term that the current index term should be added under.||NMTOKEN||#IMPLIED||No|
|%univ-atts; (%select-atts;, %id-atts;, translate, xml:lang)||A set of related attributes, described at %univ-atts;||parameter entity||PE not applicable||Not applicable|
|%global-atts; (xtrf, xtrc)||A set of related attributes, described at %global-atts;||parameter entity||PE not applicable||Not applicable|
|class||A common attribute described in Other common DITA attributes|
<purpose>An indexterm is an index entry. You can nest entries to create multi-level indexes.<indexterm>indexterm</indexterm> <indexterm>Valid in Many Places elements<indexterm>indexterm</indexterm> </indexterm></purpose>
OASIS DITA Language Specification v1.0 -- 09 May 2005
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