这样的xsl应该怎样写?

Question

<xsl:if test="position() mod 4=0"> 
==>
   <xsl:if test="(position() mod 4) = 0">

Answer 1

<TABLE BORDER="1">
  <xsl:for-each select="products/product">
    <xsl:if test="(position() mod 3) = 1">
      <TR>
        <TD><xsl:value-of select="."/></TD>
        <TD><xsl:value-of select="following-sibling::product[position()=1]"/></TD>
        <TD><xsl:value-of select="following-sibling::product[position()=2]"/></TD>
      </TR>
    </xsl:if>
  </xsl:for-each>
</TABLE>