Migrating to new versions of DITA

DITA 1.3 is compatible with prior versions of the DITA specification; all valid DITA 1.0, 1.1, and 1.2 documents are valid DITA 1.3 documents. However, some changes to existing document-type shells and specializations might be needed in order to maintain the same behavior under DITA 1.3 or to take full advantage of new DITA 1.3 features.

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