Re: passing variable through to document() call.

I have a parent document with code like:
<doc>
<render2web/> <!-- this sets the variable -->
<lookup about="consumer"/>
</doc>

And in the xsl:
<xsl:apply-templates select="document('/home/eric/lookup.xml')/doc/topic[@about=$about]"/>

Problem is that when applying the templates in this call above, the variable set
in the xml above is not seen.

How do I implement this

  <xsl:template match="lookup">
    <xsl:variable name="about" select="@about"/>
    <xsl:apply-templates
     select="document('/home/eric/lookup.xml')/doc/topic[@about=$about]">
      <xsl:with-param name="webSignal" select="../render2web"/>
    </xsl:apply-templates/>
  </xsl:template>

  <xsl:template match="topic">
    <xsl:param name="webSignal"/>
    <xsl:if test="$webSignal">
      <!--do something here-->

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