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Summing with sub-content stipulation
Code
<_data ><Outer ><Inner colour="pink" price="5.23" /><Inner colour="cerise" price="5.23" /><Inner colour="red" price="3.13" /><Inner colour="pink" price="4.78" /></Outer></_data>
The price is # sum(Outer\Inner{.colour == "pink"}.price) # units
Output
The price is 10.01 units
Ref

x.1403

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