[xsl] Interpretaion of grouping for-each

["james walker" <jameswalkerandy@xxxxxxxxxxx>]

I have this xsl:
<xsl:key name="ve-by-firstocc" match="viewentry" 
use="substring(entrydata[3]/text,1,1)" />
<xsl:template match="viewentries">
**<xsl:for-each select="viewentry[count(. | key('ve-by-firstocc', 
substring(entrydata[3]/text,1,1))[1]) = 1]">**
<xsl:for-each select="key('ve-by-firstocc', 
substring(entrydata[3]/text,1,1))">
<xsl:sort select="entrydata[3]/text" data-type="text" order="ascending"/>
<xsl:variable name="ThisDocURL" select="@unid"/>
</xsl:for-each>
</xsl:for-each>
</xsl:template>

**does anyone know an exact interpretation of this statement?
Does it go through viewentries which have dont have repeat key values?

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