[xsl] Setting attributes of FO element

["Emma Larsson" <emma dot larsson at itsip dot se>]

Hi all..

How do I set the attribute to a FO element after the element has been declared?

I want to do something like this:

<fo:table-cell>
    <xsl:if test='@colspan'>
        <fo:attribute name="number-columns-spanned">
              <fo:value-of select="@colspan" />
       </fo:attribute>
    </xsl:if>
</fo:table-cell>

That is, I want to set the attribute number-columns-spanned for the element table-cell.
But the attribute is not always set in the XML file, so I can't count on the value being 
set.. 

The 'solution' above is not supported, at least not as far as I can see. Is there any other 
way to solve the problem? Any help is appreciated...

/Emma


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