SPEC: support for diagonal lines in table cells

The current specification seems lack a feature that Excel and KSpread have:
the support for diagonal lines in spreadsheet cells. Those are defined very much
like borders (fo:border-*, see common-border-attlist), but they go along the two 
diagonals of the cell.

This could be added to (or after) 14.11.7 Cell Border:


style:diagonal-topleft defines the style of "border" to use for the topleft-bottomright diagonal.
style:diagonal-bottomleft defines the style of "border" to use for the bottomleft-topright diagonal.
Like normal borders, those two attributes follow the XSL/FO specification for borders.
See 7.29.3 - 7.29.7 of [XSL] for details

<define name="style-table-cell-properties-attlist" combine="interleave">
 <optional>
   <attribute name="style:diagonal-topleft">
        <ref name="string">
   </attribute>
 </optional>
 <optional>
   <attribute name="style:diagonal-bottomleft">
        <ref name="string">
   </attribute>
 </optional>
</define>

-- 
David Faure, , sponsored by Trolltech to work on KDE,
Konqueror (http://www.konqueror.org), and KOffice (http://www.koffice.org).