BIP: Distinct

 

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BIP has a distinct function

xdoxslt:distinct_values

If you use it on a node of elements, it returns a space separated sequence of its distinct elements.

Eg: for this xml:

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<ROWSET>
    <ROW>
        <CwaProductCode>001</CwaProductCode>
    </ROW>
    <ROW>
        <CwaProductCode>002</CwaProductCode>
    </ROW>
    <ROW>
        <CwaProductCode>001</CwaProductCode>
    </ROW>
    <ROW>
        <CwaProductCode>003</CwaProductCode>
    </ROW>
</ROWSET>

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Using <?xdoxslt:distinct_values(CwaProductCode)?> gives:

001 002 003

Using <?count(xdoxslt:distinct_values(CwaProductCode))?> gives:

3

But what if one needs to group by the distinct values, and then count the number of elements under it ? Then distinct can’t help.

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<?for-each-group:ROW;./CwaProductCode?>
<?CwaProductCode?><?'-'?><?count(current-group()/.)?>
<?end for-each-group?>

Gives the answer:

001-2
002-1
003-1

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