grouping probs

Hi,
I have a grouping problem..
the following is my xml
<?xml version="1.0"?>
<Items>

        <books>
                <book catagory = "xslt">XSLT Ref</book>
                <book catagory = "java">Java Complete  Ref</book>
                <book catagory = "xslt">XSLT Ref</book>
                <book catagory = "java">Java Complete  Ref</book>
                <book catagory = "xml"> xml/Java Guide</book>
        </books>
        <fruits>
                <fruit type = "pulp">Mango</fruit>
                <fruit type = "dry">Dates</fruit>
                <fruit type = "pulp">Orange</fruit>
                <fruit type = "seedy">Pomegranate</fruit>
                <fruit type = "pulp">Mango</fruit>
                <fruit type = "seedy">Pomegranate</fruit>
        </fruits>
</Items>

I have to write an xsl that would convert the above xml to ..
<?xml version="1.0"?>
<Items>

        <books>
                <book catagory = "xslt">XSLT Ref</book>
                <book catagory = "java">Java Complete  Ref</book>
                <book catagory = "xml"> xml/Java Guide</book>
        </books>
        <fruits>
                <fruit type = "pulp">Mango</fruit>
                <fruit type = "dry">Dates</fruit>
                <fruit type = "pulp">Orange</fruit>
                <fruit type = "seedy">Pomegranate</fruit>
        </fruits>
</Items>

Essentially it should eleminate the duplicates out of "any" element it comes 
across.i cant give conditions based on a fixed element.
so if the xsl comes across elements with same "id" and "text()"..
then it should eleminate the duplicating element "where ever found in the 
document"
any ideas as to how this can be done?


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