xsl:import or xsl:include or another alternative?

Hi again,

I'm using the "w3.org/1999/XSL/Transform" namespace now and could use some
help. The PRODUCT template below is used many times and i'd appreciate some
info on how to use xsl:import or xsl:include so that i can change it once
and have it update all my XSL files.

Thank you kindly and Happy Canada Day!

Jim


<?xml version='1.0' encoding='utf-8' ?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="1.0">

  <xsl:output method="html"/>
  <xsl:param name="category_id" select="'1.01'" />

  <xsl:template match="/">
    <!-- Set Formatting Characteristics -->
    <xsl:apply-templates
select="catalogue/product[category_id=$category_id]" />
  </xsl:template>

  <xsl:template match="product">
    <p class="heading"><xsl:value-of select="item_name"/> [<xsl:value-of
select="category_id"/>]</p>
    <p class="description"><xsl:value-of select="description"/></p>
	<p class="details">Colours: <xsl:value-of select="colours"/><br />
    Fabric: <xsl:value-of select="fabric"/><br />
    Sizes: <xsl:value-of select="sizes"/><br />
    Retail Price: CDN <xsl:value-of select="price_cdn"/> | USD <xsl:value-of
select="price_usd"/><br />
    Shipping: <xsl:value-of select="shipping"/></p>
    <p class="verysmall">More Views: <a
href="javascript:swapProdImg(0);">front</a> | <a
href="javascript:swapProdImg(1);">side</a> | <a
href="javascript:swapProdImg(2);">back</a> | <a
href="javascript:swapProdImg(3);">detail</a><br />
    Matching Items: <a><xsl:attribute
name="href">/retail/group/<xsl:value-of select="group_number"
/>/index.html</xsl:attribute><xsl:value-of select="merch_group" /></a><br />
    Browse By Category: <a><xsl:attribute
name="href">/retail/category/<xsl:value-of select="category_number"
/>/index.html</xsl:attribute><xsl:value-of select="category" /></a></p>
  </xsl:template>

</xsl:stylesheet>



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