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As part of discharging RQ-21 (provide regex and/or BNF for all primitive types), define a BNF and/or regex, lexical mapping, and canonical mapping for xsd:anyURI.
The Working Group discussed this issue at its face to face meeting of January 2006, and decided to take no further substantive action on it. The Last Call Working Draft of Datatypes says explicitly that the lexical mapping for anyURI is the identity mapping. There is no separate algorithm given for it in the appendix, but that is an editorial question, not a substantive one. I am leaving this issue open and marking it as editorial, to indicate that the substantive issue is clearly resolved in the Last Call draft, and that providing a treatment for anyURI which resembles that provided for other primitive types is a purely editorial matter.
Correction: the minutes of January 2006 show that the decision of the WG was to mark this RESOLVED / LATER, not to leave it formally open. So I'm going to do that.