arguments for xsl:call-template

Hi everyone.
I'm a beginner with XSL .
Does anyone of you has any idea  how to call a template and passing with a
node as argument.
I'm trying the following .

<xsl:template name="histogram">
   <xsl:param name="path" />
   <xsl:for-each select="$path">
      <xsl:value-of select="@value"/>
   </xsl:for-each>
</xsl:template>

<xsl:call-template name="histogram">
   <xsl:with-param name="path" select="'/report/histo/bar'" />
</xsl:call-template>

my XML looks like .
<report>
   <histo>
      <bar value="20" />
      <bar value="30" />
      <bar value="40" />
      <bar value="50" />
   </histo>

</report>


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