Qdoc's DITA XML generator has slipped further and further out of date, so that now it no longer generates useful output. The output was based on a specialization of the DITA DTDs for C+, but this specialization was more useful for generating DITA to represent the C+ code than to document it, and it didn't include support for QML, which Qt5 needs. It is expected that if QDoc users decide they need DITA XML support, a new DITA specialization will be created that better represents what QDoc needs.