DITA 2.0 base specification work

Sections that have not yet been reviewed

1. DITA terminology, notation, and conventions -- Stan
2. DITA map processing
   1. DITA maps and their usage
3. DITA addressing:
   1. @id attribute -- Bob, Frank
   2. URI-based (direct) addressing -- Stan, Christina
   3. Indirect key-based addressing -- Eric, Zoe (without keyscopes), Bob
   4. Context hooks for user assistance -- Stan
4. DITA processing
   1. Navigation -- Eliot
   2. Conditional processing -- Nancy
   3. Branch filtering -- Eliot, Stan
   4. Determing effective attribute values
5. Element reference
   1. Domain elements
      1. DITAVAL reference domain -- Eliot, Stan
6. Attributes
7. Conformance