No subject

2. Primary (and I'd throw "Complete" in here, in retrospect --- I
never really understood "complete" although I had a dream about it
recently...)
3. Timely
4. Accessible (industry standards, bulk)
5. Machine Processable
6. Non-discriminatory
7. Non-proprietary
8. License-free

Clay Johnson first pointed out to me the obvious missing one, and
Silona Bonewald has looked at it more concretely:

9. Permanence / Preservation