The architectural attributes specify the version of DITA that the content supports, identify the DITA domains that are in use by the content, and provide essential information about specializations that are in use by the content.
The architectural attributes should not be marked up in the source DITA map and topic instances. Instead, the values of the architectural attributes are handled by the processor when the content is processed, preferably through defaults set in the DTD or Schema declaration. This practice ensures that the DITA content instances do not specify invalid values for the architectural attributes.
The architectural attributes are as follows:
To make the document instance usable in the absence of a DTD or Schema declaration, a normalization process may set the architectural attributes in the document instance.
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OASIS DITA Version 1.2 -- OASIS Standard, 1 December 2010
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