[xsl] param weirdness

Subject: [xsl] param weirdness
From: "Jelks Cabaniss" <jelks@xxxxxxxx>
Date: Tue, 29 Mar 2005 12:58:57 -0500
This *should be* obvious, but sometimes the obvious isn't always to this
observer.  :)

    <xsl:call-template name="detail">
       <xsl:with-param name="category">markup</xsl:with-param>


    <xsl:template name="detail">
      <xsl:param name="category" />
        <xsl:for-each select='/config/option[@class="$category"]'>

The for-each selects *nothing*, but if I change "$category" to the
hard-coded string "markup", it works fine!

The `$category` parameter does come through, or so 

    <xsl:value-of select='$category' />

tells me.  So why does does a hard-coded category work, while "$category"


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