I have some specialized DITA documenttypes. My starting point was to create a copy of the SMA Arbortext application and then create my own specialized bddocconcept, bddocreference, bddocbookmap etc. All DTD's are valid and creation of instances based on my bddoc DTD's is working correct. My problem is that if I drag a, for example, bddoccencept document inside a bddocbookmap the title and the type attributes are not filled. Also the Format attribute stay's empty. Futhermore: if I render the bookmap I get a error like "Dita Reference "xxx" on topicrefelement in "xxx.ditamap" does not refer to refer to a dita/ditabase document. So I miss something, but what? Any ideas? Regards, Geurt