[Bug 3958] Restrict "empty" to "empty-only"?

http://www.w3.org/Bugs/Public/show_bug.cgi?id=3958

           Summary: Restrict "empty" to "empty-only"?
           Product: XML Schema
           Version: 1.0/1.1 both
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Structures: XSD Part 1
        AssignedTo: cmsmcq@w3.org
        ReportedBy: sandygao@ca.ibm.com
         QAContact: www-xml-schema-comments@w3.org


In section 3.4.6, constraint "Derivation Valid (Restriction, Complex)", there
is note:

"Note: Attempts to derive complex type definitions whose {content type} is
element-only by restricting a {base type definition} whose {content type} is
empty are not ruled out by this clause."

Why isn't this ruled out? The derived type allows whitespaces as the content,
but the base type doesn't allow it.