XSL-FO- Specifying conditional visibility - xslt

Question

I have an HTML table that varies according to its content. 1-3 columns hide. 1 column name changes. All depending on content.
I am creating a PDF version of this HTML table. The PDF version uses apache-FOP with fop v1.0. The PDF output contains 2 of the aforementioned tables on one page. I do not want to create an .xsl for every combination of possibilities. That's a lot of duplication and maintenance.
I can solve the column name change simply by passing the column name in with the XML content. But, conditional visibility of the columns seems to be a far more challenging task.
How can I setup conditional visibility? Is it possible?
I'm having difficulty just getting <fo:table-column visibility="collapse" /> to work. The data still displays with visility set to hidden or collapse. display="none" looked promising. But, the API doesn't show it as a valid property for a table-column.
If I can't conditionally hide a column then I'll need to produce 18 unique xsl files...
Currently, my tables are very basic. I do
<fo:block font-size="10pt">
<fo:table table-layout="fixed" width="100%" border-collapse="separate">
<fo:table-column />
<fo:table-column />
<fo:table-column />
<fo:table-column />
<fo:table-column />
<fo:table-column visibility="collapse" />
<fo:table-column />
<fo:table-column />
<fo:table-column />
<fo:table-column />
<fo:table-header>
<fo:table-cell border-width="0.2mm" border-style="solid">
<fo:block>Header 1</fo:block>
</fo:table-cell>
//...9 other headers (these should show/hide as needed)
</fo:table-header>
<fo:table-body>
<xsl:for-each select="Object/type/SomeItem/ProcedureItemCollection">
<fo:table-row>
<fo:table-cell border-width="0.2mm" border-style="solid" >
<fo:block>
<xsl:value-of select="content1"/>
</fo:block>
</fo:table-cell>
//...9 other cells...
</fo:table-row>
</xsl:for-each>
</fo:table-body>
</fo:table>
</fo:block>
XML
<Procedure>
<SiteName>Site1</SiteName>//If Site1, don't create column 2
//If Site2, don't create column 2,3,4
//If Site3, create all columns
<itemtype1>
<item><member1></member1><member2></member2></item>
<item><member1></member1><member2></member2></item>
</itemtype1>
<itemtype2>
<item><member1></member1><member2></member2></item>
<item><member1></member1><member2></member2></item>
</itemtype2>
</Procedure>
Doing it this way, I have little flexibility in creating the table. But, this is all I know how to do.

Answer 1

After a lot of tinkering it turns out that I can add/remove columns using xsl:when and a variable.
First create a variable
<xsl:variable name="SiteName" select="Procedure/SiteName" />
Then conditionally create the 3 elements of the table (column definition, header, body). Starting with the column definition...
<xsl:choose>
<xsl:when test="$SiteName = 'Site1'">
<fo:table-column />//column 2
</xsl:when>
</xsl:choose>
Then the header
<xsl:choose>
<xsl:when test="$SiteName = 'Site1'">
<fo:table-cell border-width="0.2mm" border-style="solid">
<fo:block>Column2</fo:block>
</fo:table-cell>
</xsl:when>
</xsl:choose>
Finally, the body
<xsl:choose>
<xsl:when test="$SiteName = 'Site1'">
<fo:table-cell border-width="0.2mm" border-style="solid" >
<fo:block>
<xsl:value-of select="column2value"/>
</fo:block>
</fo:table-cell>
</xsl:when>
</xsl:choose>