I have this xsl

<?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:key name="RouterList" match="Router" use="Supplier"/>

<!-- Template for our root rule -->
<xsl:template match="/">
	<xsl:apply-templates/>
</xsl:template>

<!-- Template for our "products" rule -->
<xsl:template match="RouterList">

<!--Step 2: Loop through the unique regions (the primary key) in our
document.  -->
<xsl:for-each
select="//Router[generate-id(.)=generate-id(key('RouterList',Supplier))]">

		<!-- Sort Primary key by name in ascending order -->
    	<xsl:sort select="Supplier" order="ascending"/>

    	<!-- Display the region as our table header -->
   		<div style="background-color:#f2f2f2;"><xsl:value-of
select="Supplier"/></div>
		<br/><br/>
	</xsl:for-each>
</xsl:template>

</xsl:stylesheet>

it works well but I need to find the min value  for each supplier:

I tryed with:   <xsl:value-of
select="min(//Router/GroupList/Group/OutwardList/Outward/Price/Amount)"/>

but is not correct

But if I use

<xsl:value-of
select="//Router/GroupList/Group/OutwardList/Outward/Price/Amount"/>

I display the "first" value linked to the supplier  not the min one.