2.1.4.3.8.1 DTD syntax specialization module coding requirements

To be extensible and backward compatible, DITA requires that a DTD implementation of structural and domain specialization modules conform to well-defined implementation (coding) requirements.

These coding requirements implement the specialization architecture with the capabilities and within the limitations of the DTD grammar. They are the coding requirements for structural specializations, element domain specializations, and attribute domain specializations.

• 2.1.4.3.8.1.1 General element type declaration coding requirements
  Structural and element domain vocabulary modules must reflect the same coding requirements for element type declarations.
• 2.1.4.3.8.1.2 Structural module coding requirements
  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.
• 2.1.4.3.8.1.3 Topic type module coding requirements
  Topic type vocabulary modules must conform to additional coding requirements for defining default topic nesting.
• 2.1.4.3.8.1.4 Element domain module coding requirements
  An element domain vocabulary module defines element types that are appropriate for the subject-matter or application domain for which they are designed. The purpose is usually to enhance the user's interaction by providing "semantic" elements whose names more accurately denote their content, making that content easier to search and retrieve.
• 2.1.4.3.8.1.5 Attribute domain module coding requirements
  An attribute domain vocabulary module declares a new attribute specialized from either the @props or @base attribute. An attribute domain module defines exactly one new attribute type.

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