[xsl] Count of unique elements [XSLT 1.0]

Hi all,

The XML:

        <product>
                <prodid>V667320</prodid>
                <name>Battery Pack</name>
                <price>$20</price>
                <quantity>178</quantity>
                <region>SouthWest</region>
        </product>
        <product>
                <prodid>M382932</prodid>
                <name>CD Visor Organizer</name>
                <price>$19</price>
                <quantity>129</quantity>
                <region>NorthWest</region>
        </product>
        <product>
                <prodid>U3923839</prodid>
                <name>Rock n Roll Supercart</name>
                <price>$150</price>
                <quantity>200</quantity>
                <region>SouthWest</region>
        </product>
        <product>
                <prodid>Q3929302</prodid>
                <name>Digital Tire Guage</name>
                <price>$40</price>
                <quantity>623</quantity>
                <region>NorthWest</region>
        </product>

I want to count the unique elements 'region' into XML. In this example
the count result must be "2" - there's two unique 'region': NorthWest
and SouthWest.

Any help is appreciated.

BR
Plamen

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