DITA provides some attributes to provide type information to processors instead of qualifications or properties of content.
Ordinarily, architectural attributes don't appear in the source files for document instances. Instead, architectural attributes appear in document instances through defaults set in the DTD or Schema declaration. This practice ensures that the creation of document instances cannot produce invalid values for the architectural attributes. These attributes are as follows:
To make the document instance usable without the DTD or Schema declaration, a normalization process can instill the architectural attributes in the document instance.
OASIS DITA Architectural Specification v1.0 -- 09 May 2005
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