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The EBNF for the production VersionRanges ::= VersionRange S? "," S? VersionRange within the 2nd October Last Call Working draft (http://www.w3.org/TR/xslt-30/#package-versions) appears to require a pair of Version Ranges. I suspect the intent was: VersionRanges ::= VersionRange (S? "," S? VersionRange)* which was that suggested in https://www.w3.org/Bugs/Public/show_bug.cgi?id=26649 . There appears to be no other discussion of such a change in Bugzilla that I can find. The current form cannot of course express a single package version requirement, save that it is 'doubled' ;-).
In addition, the production: VersionFromTo ::= PackageVersion S "to" S VersionPrefix does not correspond with the detailed examples in the subsequent bullet point: The range VersionFromTo matches any version that is greater than or equal to the starting PackageVersion, and less than or equal to some version that matches the VersionPrefix. For example, 1 to 5 matches 1.1, 2.1, 3.1, or 5.0 (but not 5.1), while 1 to 5.* matches all of these, plus versions such as 5.7.2 (but not 6.0 or 6.0-beta). The first example uses PackageVersion as the 'to' operand. I suspect the production should be: VersionFromTo ::= PackageVersion S "to" S (PackageVersion | VersionPrefix)
Agreed, we should fix both these errors.