XSLT Global count of grouped items - xslt

Question

I have a set of items which I am grouping using the muenchian method using keys. This is working great, however when I try to do things with the first x number of items it is doing it on the x number of items in each group rather than across the whole set of results. How would I get the individual position of each item accross the whole collection?
<xsl:key name="pictures-by-productid" match="/dsQueryResponse/Rows/Row" use="#ProductId" />
<xsl:template match="/">
<div style="border:1px solid red; float:left;">
<xsl:apply-templates select="/" mode="sub">
</xsl:apply-templates>
</div>
</xsl:template>
and the second template
<xsl:template match="/" mode="sub"> <xsl:for-each select="/dsQueryResponse/Rows/Row[count(. | key('pictures-by-productid', #ProductId)[1]) = 1]">
<xsl:for-each select="key('pictures-by-productid', #ProductId)">
<xsl:sort select="#PictureType" />
<div style="float:left; margin:2px;">
<img src="{#ThumbNailUrl}" width="58" /> <br />
Download
<xsl:number value="position()" format="1. " />
<xsl:value-of select="." />
</div>
</xsl:for-each>
</xsl:for-each>
</xsl:template>

Answer 1

<xsl:key
name="pictures-by-productid"
match="/dsQueryResponse/Rows/Row"
use="#ProductId"
/>
<xsl:template match="/">
<div style="border:1px solid red; float:left;">
<!-- iterate the group, sorted by PictureType… -->
<xsl:for-each select="/dsQueryResponse/Rows/Row[
count(. | key('pictures-by-productid', #ProductId)[1]) = 1
]">
<xsl:sort select="#PictureType">
<!-- …and output only if among the fist 6 items -->
<xsl:if test="position() <= 6">
<xsl:apply-templates
mode="picture"
select="key('pictures-by-productid', #ProductId)"
/>
</xsl:if>
</xsl:for-each>
</div>
</xsl:template>
<xsl:template match="/dsQueryResponse/Rows/Row" mode="picture">
<div style="float:left; margin:2px;">
<img src="{#ThumbNailUrl}" width="58" /> <br />
<xsl:text>Download </xsl:text>
<xsl:number value="position()" format="1. " />
<xsl:value-of select="." />
</div>
</xsl:template>