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Tag option conventions

You are free to invent whatever option names you prefer. Well, almost. There are a few simple conventions:

Options presented to a user (the documented ones ;-) should not begin or end with an underscore.
Special option tags evaluated by the parser begin and end with one underscore. They are made known to the user, and this convention distinguishs them from the tags own options. \REF's option _cnd_ is an example.
Informations intended to be used internally only (to pass informations between various tag hooks or to the backend) begin and end with two underscores.

That's all to take care of here.