XSL Unique values

I have an xml document which looks like this:

<products>
        <product>
                <name>shirt</name>
                <metadata fieldid="1">
                        <fieldvalue>long sleeve</fieldvalue>
                        <metadata fieldid="2">
                                <fieldvalue>red</fieldvalue>
                                <metadata fieldid="3">
                                        <fieldvalue>RG</fieldvalue>
                                </metadata>
                                <metadata fieldid="3">
                                        <fieldvalue>LN</fieldvalue>
                                </metadata>
                        </metadata>
                </metadata>
                <metadata fieldid="1">
                        <fieldvalue>short sleeve</fieldvalue>
                        <metadata fieldid="2">
                                <fieldvalue>blue</fieldvalue>
                                <metadata fieldid="3">
                                        <fieldvalue>RG</fieldvalue>
                                </metadata>
                                <metadata fieldid="3">
                                        <fieldvalue>SM</fieldvalue>
                                </metadata>
                        </metadata>
                </metadata>
                <metadata fieldid="1">
                        <fieldvalue>sleeveless</fieldvalue>
                        <metadata fieldid="2">
                                        <fieldvalue>red</fieldvalue>
                                <metadata fieldid="3">
                                        <fieldvalue>LN</fieldvalue>
                                </metadata>
                                <metadata fieldid="3">
                                        <fieldvalue>SM</fieldvalue>
                                </metadata>
                        </metadata>
                </metadata>
        </product>
        <product>
                <name>t-shirt</name>
                <metadata fieldid="1">
                        <fieldvalue>long sleeve</fieldvalue>
                        <metadata fieldid="2">
                                <fieldvalue>red</fieldvalue>
                                <metadata fieldid="3">
                                        <fieldvalue>AA</fieldvalue>
                                </metadata>
                                <metadata fieldid="3">
                                        <fieldvalue>BB</fieldvalue>
                                </metadata>
                        </metadata>
                </metadata>
                <metadata fieldid="1">
                        <fieldvalue>short sleeve</fieldvalue>
                        <metadata fieldid="2">
                                <fieldvalue>blue</fieldvalue>
                                <metadata fieldid="3">
                                        <fieldvalue>CC</fieldvalue>
                                </metadata>
                                <metadata fieldid="3">
                                        <fieldvalue>DD</fieldvalue>
                                </metadata>
                        </metadata>
                </metadata>
                <metadata fieldid="1">
                        <fieldvalue>sleeveless</fieldvalue>
                        <metadata fieldid="2">
                                        <fieldvalue>red</fieldvalue>
                                <metadata fieldid="3">
                                        <fieldvalue>AA</fieldvalue>
                                </metadata>
                                <metadata fieldid="3">
                                        <fieldvalue>EE</fieldvalue>
                                </metadata>
                        </metadata>
                </metadata>
        </product>
</products>

Is there any way using XSL I can get the unique
metadata[(_at_)fieldid=3]/fieldvalues for each product. I
know I can do it across the entire XML doc. In this
example for product(name=shirt) it would be RG,LN and
SM , product(name=t-shirt) it would be AA,BB,CC,DD,EE.
I want to be able to get these separately for each
product and iterate through it within the product if
possible.

Thank you.
Prakash





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