[Bug 13406] New: "caption-side" should be "Extended" conformance level

http://www.w3.org/Bugs/Public/show_bug.cgi?id=13406

           Summary: "caption-side" should be "Extended" conformance level
           Product: XSLFO
           Version: 1.1
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: minor
          Priority: P2
         Component: XSL-FO
        AssignedTo: tgraham <at> mentea.net
        ReportedBy: tgraham <at> mentea.net
         QAContact: xsl-editors <at> w3.org

The "caption-side" property [1] is listed in section B.3 [2], Property Table:
Part II, as having "Complete" conformance level.  It should be "Extended"
conformance level.

"caption-side" applies only to fo:table-and-caption [3], where it "specifies
the position of the caption box with respect to the table box."  The "caption
box" is the optional fo:table-caption [4] child of fo:table-and-caption.

fo:table-and-caption has "Basic" conformance level [5], and fo:table-caption
has "Extended" conformance level [5], but there's little point implementing
fo:table-caption without implementing "caption-side", since that is a major
part of the correct implementation of fo:table-caption.

Furthermore, "Extended" conformance [6] is defined as "includes everything
else, except for shorthands", and "Complete" conformance is defined as