[Bug 3379] extension-element-prefixes="#default"

http://www.w3.org/Bugs/Public/show_bug.cgi?id=3379

           Summary: extension-element-prefixes="#default"
           Product: XPath / XQuery / XSLT
           Version: Candidate Recommendation
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: XSLT 2.0
        AssignedTo: mike@saxonica.com
        ReportedBy: joannet@ca.ibm.com
         QAContact: public-qt-comments@w3.org


Second paragraph in section 18.2.1 reads:
"The default namespace (as declared by xmlns) may be designated as an extension
namespace by including #default in the list of namespace prefixes."

It doesn't mention what happens if the parent element has no default namespace.
 A new error should be added to disallow this.

thanks,
Joanne Tong