[Bug 5444] [SER] Non-XHTML elements with XHTML output method

http://www.w3.org/Bugs/Public/show_bug.cgi?id=5444

           Summary: [SER] Non-XHTML elements with XHTML output method
           Product: XPath / XQuery / XSLT
           Version: Recommendation
          Platform: PC
        OS/Version: Windows NT
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Serialization
        AssignedTo: zongaro@ca.ibm.com
        ReportedBy: tim@cbcl.co.uk
         QAContact: public-qt-comments@w3.org


The description of the HTML output method describes how elements not defined in
HTML (but in the null namespace) and elements in non-null namespaces should be
handled.  There doesn't appear to be a corresponding description for handling
how elements not defined in XHTML but in the XHTML namespace and elements in
non-XHTML namespaces should be treated.

Specifically, how should they be treated with regards to indentation, and how
should empty elements be rendered (<foo:empty/>, <foo:empty /> or
<foo:empty></foo:empty>.