XSLT: Applying templates with conditional parameters?

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I'd like to apply a template with different parameters based on the result of a conditional. Something like this:

<xsl:choose>
    <xsl:when test="@attribute1">
        <xsl:apply-templates select='.' mode='custom_template'>
            <xsl:with-param name="attribute_name" tunnel="yes">Attribute no. 1</xsl:with-param>
            <xsl:with-param name="attribute_value" tunnel="yes"><xsl:value-of select="@attribute1"/></xsl:with-param>
        </xsl:apply-templates>
    </xsl:when>
    <xsl:when test="@attribute2">
        <xsl:apply-templates select='.' mode='custom_template'>
            <xsl:with-param name="attribute_name" tunnel="yes">Attribute no. 2</xsl:with-param>
            <xsl:with-param name="attribute_value" tunnel="yes"><xsl:value-of select="@attribute1"/></xsl:with-param>
        </xsl:apply-templates>
    </xsl:when>
    <xsl:otherwise>
        <xsl:apply-templates select='.' mode='custom_template'>
            <xsl:with-param name="attribute_name" tunnel="yes">Error</xsl:with-param>
            <xsl:with-param name="attribute_value" tunnel="yes">No matching attribute   </xsl:with-param>
            </xsl:apply-templates>
    </xsl:otherwise>
</xsl:choose>

First of all, I suspect that this could be resolved in a much, much better way. (I'm entirely new to XSLT, so please suggest improvements and forgive the bloated code.)

Now for the question: how could I've set the parameters based on this conditional, and still used them in an xsl:apply-templates? I've tried to wrap the entire xsl:choose with a xsl:apply-templates start-/end-tag, but that's apparently not legal. Any clues?


An alternate method would be to put the xsl:choose statements within the xsl:param elements

<xsl:apply-templates select="." mode="custom_template">
   <xsl:with-param name="attribute_name" tunnel="yes">
      <xsl:choose>
         <xsl:when test="@attribute1">Attribute no. 1</xsl:when>
         <xsl:when test="@attribute2">Attribute no. 2</xsl:when>
         <xsl:otherwise>Error</xsl:otherwise>
      </xsl:choose>
   </xsl:with-param>
   <xsl:with-param name="attribute_value" tunnel="yes">
      <xsl:choose>
         <xsl:when test="@attribute1"><xsl:value-of select="@attribute1"/></xsl:when>
         <xsl:when test="@attribute2"><xsl:value-of select="@attribute1"/></xsl:when>
         <xsl:otherwise>No matching attribute </xsl:otherwise>
      </xsl:choose>
   </xsl:with-param>
</xsl:apply-templates>