Language reference : Base architecture : Metadata elements : Prolog (metadata) elements : category
   
category
The <category> element represents any category by which a topic might be classified for retrieval or navigation. For example, the categories could be used to group topics in a generated navigation bar. Topics can belong to multiple categories.
Such classifications are likely to come from an enumerated or hierarchical set.
This element is equivalent to both the Coverage element and the Subject element in Dublin Core.
Contains
Note: These models represent only the default document types distributed by OASIS. Actual content models will differ with each new document type.
Doctype
Content model
topic (base), map (base), classifyMap, subjectScheme, learningAssessment, learningBookmap, learningContent, learningMap, learningOverview, learningPlan, learningSummary
( text data or data or data-about or foreign or unknown or keyword or term) (any number)
topic (technical content), map (technical content), concept, ditabase, glossary, glossentry, glossgroup, reference, task, bookmap
( text data or data or data-about or foreign or unknown or keyword or apiname or option or parmname or cmdname or msgnum or varname or wintitle or term or abbreviated-form) (any number)
machineryTask
( text data or data or data-about or foreign or unknown or keyword or wintitle or term) (any number)
Contained by
Doctype
Content model
topic (base), topic (technical content), concept, ditabase, glossary, glossentry, glossgroup, reference, task (strict), task (general), machineryTask, learningAssessment, learningContent, learningOverview, learningPlan, learningSummary
map (base), map (technical content), classifyMap, subjectScheme, learningMap
bookmap, learningBookmap
Inheritance
- topic/category
Example 110. Example

<prolog>
<metadata>
<category>Things that are blue</category>
</metadata>
</prolog>
Attributes
Name
Description
Data Type
Default Value
Required?
univ-atts attribute group (includes select-atts, id-atts, and localization-atts groups)
A set of related attributes, described in univ-atts attribute group
global-atts attribute group (xtrf, xtrc)
A set of related attributes, described in global-atts attribute group
class
A common attribute described in Other common DITA attributes