Simple XSL question

Hi,

I want to insert a image in a table. The location of the image is stored in
a XML file.
How can I load this file into the table. I tried this:

<fo:table-cell padding-left="7cm"><fo:block><fo:inline-graphic height="3cm"
width="3cm"
         href="<xsl:value-of select="header/headerimage/url"
/>"/></fo:block></fo:table-cell>


But this does not seem to be legal syntax. Does somebody know how to do
this?

Thanks in advance,

Rob


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