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Rather than a numeric limit for TYPEs (or anything else, for that matter), I propose an operational rule of thumb for selection of options for any element: The Law of Instructional Parsimony: If you cannot make clear the selection options for a given element on a single browser page, then it is too complex for straightforward deployment. Further elaboration should be driven into domain- or application-specific schemes. Yes, there is vagueness and wiggle-room here. Vagueness is virtue. stu