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[@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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