[relax-ng-comment] XML 1.1 and a possible RELAX NG technicalcorrigendum

[John Cowan <jcowan@reutershealth.com>]

The first XML 1.1 WD has just been issued, proposing an extremely loose
model for XML 1.1 names; basically, anything goes except the ASCII
symbols, a block of Unicode symbols, and a few other things.

James has in the past suggested that XML name rules should be checked at
the validation level rather than at the well-formedness level.  In
pursuit of this, it would be fitting for RELAX NG to support such
validation.

I propose the following approach, to be instantiated in a RELAX NG
TC when and if XML 1.1 becomes a W3C Recommendation:

Allow a name to be matched against a datatype, with syntax
<name><data type="goodname">...</data></name>.  This syntax represents
the class of names that are lexically equivalent to strings of type
goodname in some datatype library or other.  In particular, one could
make use of the XSD2 pattern datatype to specify useful patterns.

One could also provide this as a RELAX NG extension by creating
an additional namespace containing only the data element, thus
making etc:data a legal foreign element.  However, since its
semantics are essentially the same as the rng:data element, this seems
less desirable.

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