Authors that use the default task DTD or Schema provided by OASIS will continue to see the strict task model when upgrading to DITA 1.2 or DITA 1.3. Authors wishing to use the general task model will need to migrate their DITA 1.1 documents to reference the general task document type shell.
DITA document type shells that include the task module as-is, or that specialize the <task> element without specializing <taskbody>, will also need to include the strict taskbody constraint module in order to maintain the order and cardinality of prior DITA versions.
Task specializations that specialize the <taskbody> element will not be affected by the new model, although they can be updated as needed to take advantage of the new elements.
See appendix for information about this element in OASIS document type shells.
- topic/body task/taskbody