[Bug 5527] Why is NCName optional?

http://www.w3.org/Bugs/Public/show_bug.cgi?id=5527

           Summary: Why is NCName optional?
           Product: SML
           Version: LC
          Platform: PC
        OS/Version: Windows NT
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Core
        AssignedTo: cmsmcq@w3.org
        ReportedBy: pratul.dublish@microsoft.com
         QAContact: public-sml@w3.org


Minor comment from
http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2008Mar/0001.html 

4.5.1.2: Since XML Schema uses XPath 1.0 rules for names, surely the
NCName: isn't optional, it _must_ be present, and in any case, it
should be stated that there must be an NS Binding for that prefix to
the SML namespace in scope.