[xsl] Unique Nodes

Hi ,
I am new to XSLT.
I have to grab the unique Products from the Input below

INPUT:

<Proposal>
        <Quote>
        <QuoteId>1</QuoteId>
                <Products>        
                        <Product>
                                <ProdID>
                                        1234
                                </ProdID>
                                <ProdID>
                                        5678
                                </ProdID>
                        </Product>
                </Products>
        </Quote>
        <Quote>
        <QuoteId>2</QuoteId>
                <Products>        
                        <Product>
                                <ProdID>
                                        1234
                                </ProdID>
                                <ProdID>
                                        5678
                                </ProdID>
                        </Product>
                </Products>
        </Quote>
</Proposal>

Desired OUTPUT:

<Proposal>
        <Products>
                <ProdId>1234</ProdId>
                <ProdId>5678</ProdId>
        </Products>
</Proposal>


The code which I am trying is

<xsl:variable name="unique-Product"
select="//Proposal/Quote/Products/Product[not(ProductId=ancestor::Product/ProductId)]"/>

        <xsl:for-each select="$unique-Product">
        </xsl:for-each>

Any help is appreciated

Thanks in advance
Karthik

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