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Desideratum: for each primitive type, (1) supply an explicit grammar for the lexical space. Following on from this: (2) supply formal definition of the lexical mapping for each primitive or special type. (The ordinary simple types won't need one, because they use the lexical mapping of their primitive type, restricted by their facets.) (3) supply formal definition of the canonical mapping, too.
The WG discussed this at length at its face to face of August 2005. Ultimately, we agreed to refer to the relevant IEEE spec for a normative rule for the lexical and canonical mappings (assuming we find such info there), rather than providing definitions of our own. For more details, see the minutes.
There is no further/additional work to be done for this bug other than that required for the bugs it depends on.
All of the dependent issues having been closed (either fixed, marked WONTFIX, or marked LATER), this one can also be closed. I'm marking this LATER, since one of the dependent issues is so marked.