[xsl] Error when params are in Xpath expression

Subject: [xsl] Error when params are in Xpath expression
From: Dmitri Snytkine <d.snytkine@xxxxxxxxx>
Date: Tue, 12 May 2009 07:06:29 -0400
<!-- get translation of a string -->
    <xsl:template name="translateString">
        <xsl:param name="str" select="'recent_albums'"/>
        <xsl:param name="toLang"/>
        <xsl:param name="fallback" select="'en'"/>
            <xsl:when test="true()">

                <xsl:value-of select="'not found'"/>

I get errors when running this template.
If I manually replace the $str and $toLang, then I am getting the
correct result.

<xsl:value-of select="document('')/*/trans:tr/tr_string[@str='recent_images']/ru"/>

What is wrong with my syntax that uses params? Are params allowed in
Xpath expression?

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