[Bug 8477] New: [XSLT 2.0] lang attribute of xsl:sort and xsl:number

http://www.w3.org/Bugs/Public/show_bug.cgi?id=8477

           Summary: [XSLT 2.0] lang attribute of xsl:sort and xsl:number
           Product: XPath / XQuery / XSLT
           Version: Recommendation
          Platform: PC
        OS/Version: Windows NT
            Status: NEW
          Severity: normal
          Priority: P2
         Component: XSLT 2.0
        AssignedTo: mike@saxonica.com
        ReportedBy: mike@saxonica.com
         QAContact: public-qt-comments@w3.org


For both xsl:sort and xsl:number we make two statements about the lang
attribute:

(a) we give the format in the syntax template as 

lang? = { nmtoken }

(b) we say that the range of permitted values is the same as for xml:lang, with
a reference to the XML specification

These are inconsistent: the xml:lang attribute allows a zero-length string,
whereas nmtoken does not. 

Also, the reference to xml:lang could be taken as implying that the language
must be present in the various lists of registered languages, rather than
merely conforming to the correct syntax.

I would suggest that 

(i) we change the syntax template to 

lang? = { xs:language? }

(ii) rather than referring to xml:lang, we say that the value must either be a
zero-length string or a string in the value space of xs:language. This makes it
clear that the constraint is purely syntactic.

(iii) we specify that the zero length string has the same effect as omitting
the lang attribute.


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