A structural vocabulary module defines a new topic or map type as a specialization of a base topic or map type. The purpose is usually to enhance the user's interaction by adapting the topic or map type to its particular purposes.
A structural type module must conform to the following coding requirements in addition to the general module coding requirements:
Default included domains entity
<!ENTITY included-domains "">
A document type shell can predefine the included-domains entity to list domains to be added to the document type.
<!ENTITY included-domains "(topic myDomain)">
The list of included domains must declare the domains from most generic (on the left) to most specialized, current domain (on the right). See Domain usage declaration (the @domains attribute).
Topic and map element attributes
The topic or map element type must set the @DITAArchVersion attribute to the DITAArchVersion entity and the @domains attribute to the included-domains entity. These attributes give processors a reliable way to check the architecture version and look up the list of domains available in the document type.
<!ATTLIST concept %concept.attributes; %arch-atts; domains CDATA "&included-domains;" >