Equivalence of document-type shells

Two distinct DITA document types that are taken from different tools or environments might be functionally equivalent.

A DITA document type is defined by the following:

Two document-type shells define the same DITA document type if they integrate identical vocabulary modules, constraint modules, and rules for topic nesting. For example, a document type shell that is an unmodified copy of the OASIS-provided document-type shell for topic defines the same DITA document type as the original document-type shell. However, the new document-type shell has the following differences:

Note: The public or system identifier that is associated with a given document-type shell is not, by itself, necessarily distinguishing. This is because two different people or groups might use the same modules and constraints to assemble equivalent document type shells, while giving them different names or public identifiers.

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