set diffincludes= { on | off}

If on is specified, files included using XML inclusions will be expanded in the Compare window and the contents will be compared between the source and target documents. In this case, the expanded content appears in the Compare window. If the Compare document is saved, then the expanded included content is flattened and saved in the Compare document.

If off is specified, XML inclusion references are compared instead of their content. The default is off.