variable as attribute value of fo:block

I like to have:
<xsl:variable name="padding_vor_gross" select="1cm"/>

<fo:block padding-before="$padding_vor_gross">
or
<fo:block padding-before="{$padding_vor_gross}">
or
<fo:block padding-before="($padding_vor_gross)">

Can you call a variable only in the <xsl:value-of> argument?

No Luck so far.

thank you
thomas


XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list