The use of a variable in use-attribute-sets attribute

Hi all,

I can't find much documentation, aside from the spec, about the use of the use-attribute-sets attribute. I'm in the process of trying to write a stylesheet to transform one XSL document (that creates HTML) into another (that creates an XSL-FO). In my source document I have some code like:

<!-- some code -->
	<td class="classname">
		<!-- some more code -->
	</td>
<!-- some code -->

which I want to transform to 

<!-- some code -->
	<fo:table-cell font-size="12pt" font-weight="bold">
		<fo:block>
			<!-- some more code -->
		</fo:block>
	</fo:table-cell>
<!-- some code -->

I thought I had a brainwave in creating an XSL using attribute-sets to match each of the different HTML stylesheet classes, but using a variable for the value of the use-attribute-sets attribute doesn't appear to work. I also tried putting the variable select as an attribute, just in case, but with no success. Any ideas would be most appreciated, I think my problem is a lack of understanding of what a QName is.

Below is a snippet of the XSL code.

Thanks in advance,
Joshua

<!-- some code -->
<xsl:template match="td">
	<xsl:variable name="class">
		<xsl:value-of select="@class"/>
	</xsl:variable>
	<xsl:element name="fo:table-cell" use-attribute-sets="$class">
		<xsl:element name="fo:block">
			<xsl:apply-templates/>
		</xsl:element>
	</xsl:element>
</xsl:template>

<xsl:attribute-set name="classname">
	<xsl:attribute name="font-size">12pt</xsl:attribute>
	<xsl:attribute name="font-weight">bold</xsl:attribute>
</xsl:attribute-set>
<!-- some code -->

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