###### 2.1.4.3.8 Specialization module coding requirements

The base DITA element and attribute types may be extended through the creation of new vocabulary modules that define specializations of more-general types.

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Parent Topic: 2.1.4.3 Specialization

Child Topics:

2.1.4.3.8.1 DTD syntax specialization module coding requirements

2.1.4.3.8.2 XSD schema specialization module coding requirements

Sibling Topics:

2.1.4.3.1 Vocabulary modules

2.1.4.3.2 Requirements for specialized element types and attributes

2.1.4.3.3 Element type specialization hierarchy declaration (the @class attribute)

2.1.4.3.4 Domain usage declaration (the @domains attribute)

2.1.4.3.5 Generalization

2.1.4.3.6 Attribute generalization

2.1.4.3.7 Specializing foreign or unknown content