Stage one proposal: drop domains (the attribute, not the concept, and only mostly)

That's right, I'm finally going there with a stage one proposal.

We should drop the requirement for domain tokens in the @domains attribute, apart from attribute domains (which must still be specified in order to support filtering / generalization based on those attributes).

We could rename @domains at that point to something like @specializedatts but I doubt it would be worth it (and preserving the attribute name would let people continue to declare the tokens, if they wish).

Some of you may remember I wrote up a little -- er, rather long -- rant about the tokens a year or two ago; if you didn't read it then and need help getting to sleep, you can see read about what prompted this proposal here:
http://metadita.org/toolkit/nonononodomains.html

Robert D. Anderson
DITA-OT lead and Co-editor DITA 1.3 specification
Marketing Services Center

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