template math:min

Hello
 
If I am using the template math.min it produces only NaN.
 
But if I am using instead just an odd variable like
 
   <xsl:variable name="minTime">
     <xsl:variable name="nodes" select="../sampleResult[@label =
current()/@label]/@time" />
     <xsl:choose>
      <xsl:when test="not($nodes)">NaN</xsl:when>
      <xsl:otherwise>
       <xsl:for-each select="$nodes">
        <xsl:sort data-type="number" order="ascending" />
        <xsl:if test="position() = 1">
         <xsl:value-of select="number(.)" />
        </xsl:if>
       </xsl:for-each>
      </xsl:otherwise>
     </xsl:choose>
   </xsl:variable>
This is pretty much the same as math.min. It produces the right output.
 
My call to math.min looks as follows:
 
   <xsl:variable name="minTime">
    <xsl:call-template name="min">
     <xsl:with-param name="nodes" select="../sampleResult[@label =
current()/@label]/@time" />
    </xsl:call-template>
   </xsl:variable>
 
This produces just NaN. 
 
Whats wrong? I read a lot about the math.min function, but I just don't
get it.
I am thankful for any ideas, cause my xsl is getting really long and I
wanna avoid any unneccessary code.
 
regards chris

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