Need support for the DITA 1.3 standard, including:

• The basics--support for new topic types (i.e troubleshooting), new domains, and new base elements
• Support for scoped keys. Need better support for keys in general, including:
  • Previewing topics within the context of the keys defined in a publication.
  • Creating/specifying the key space when opening topics in the editor.
  • Interface for creating/managing keys--
    • Something easier than creating individual keydef tags for every single key. 
    • See which keys are referenced in a publication, but are not defined. 
    • When referencing a key, see a list of what all keys have been defined, rather than having to type the key in.
• Support for branch filtering (http://docs.oasis-open.org/dita/dita/v1.3/os/part3-all-inclusive/archSpec/base/branch-filtering.html#branch-filter)
  • Using <ditavalref> to reference a .ditaval
  • Editing and checking .ditavals in
  • Previewing topics within the context of a branch