###### 2.1.2.1.7 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 2-1 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)

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Parent Topic: 2.1.2.1 DITA topics

Sibling Topics:

2.1.2.1.1 The topic as the basic unit of information

2.1.2.1.2 The benefits of a topic-based architecture

2.1.2.1.3 Information typing

2.1.2.1.4 Generic topics

2.1.2.1.5 Topic structure

2.1.2.1.6 Topic content