[BlueXML-user] export url in bx

Hi,

in the file data-tamer\src\blocks\data-tamer\webapp\common\stylesheets\action\action-export.xsl, 

I dont understand this :

    <xsl:variable name="_href">
        <param><xsl:value-of select="$ws"/></param>
        <xsl:if test="not(contains($ws, '?'))">
            <param>?</param>
        </xsl:if>
        <param><xsl:value-of select="$query-string-result"/></param>
    </xsl:variable>
    <a title="{$content}">
        <xsl:attribute name="href"><xsl:value-of select="string($_href)"/></xsl:attribute>


What is the use of the <param> tags in the _href variable ?
What is the string function doing ?

Marc
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