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.
See appendix for information about this element in OASIS document type shells.
<prolog> <metadata> <category>Things that are blue</category> </metadata> </prolog>
The following attributes are available on this element: Universal attribute group.