I have been modifying the DITA 1.2 EDDs for my custom features and switching in my template customizations for tags and page layout. I understand the text insets, the need to modify the inset eddmod files and update the text insets in the referencing files. However, I can't figure out the order of precedence among the EDDs and which templates to import them into to get the full set. If I import one EDD into the basetopic.template, I get errors about elements that are referenced but not defined. I try to import EDDs that define those elements to whittle down the list, but then a subsequent EDD import takes me back to more elements that are not defined. This result makes me think that importing definitions is not an accumulative process as with importing formats but a wipeout process, as in losing all memory of element definitions previously imported. Can somebody explain how this is supposed to work? It's a lot more complicated than previous versions of DITA.
Susan