Topic domains: Basic DITA

A DITA vocabulary domain defines a set of elements associated with a particular subject area or authoring requirement regardless of topic type. DITA incorporates three domains into the basic DITA content: typographic, utilities, and indexing. Other domains are incorporated into the DITA Technical Content and Learning and Training specializations.

The elements in a domain are defined in a domain module. A domain module can be integrated with a topic type to make the domain elements available within the topic type structure. The following domains are provided as part of basic DITA:

Table 1. DITA topic domains: Basic DITA
Domain	Description	Short name	Module name
Typographic	For highlighting when the appropriate semantic element doesn't exist yet	hi-d	highlightDomain.mod (DTD) highlightDomain.xsd (Schema)
Utilities	For providing imagemaps and other useful structures	ut-d	utilitiesDomain.mod (DTD) utilitiesDomain.xsd (Schema)
Indexing	For extended indexing functions such as see and see-also	indexing-d	indexingDomain.mod (DTD) indexingDomain.xsd (Schema)

2.1.2.1.7 Topic domains: Basic DITA