Selecting a set of nodes

Hi,

I´m working with the following source:
    <d size-d="500">
        <c id="1" size-c="114"/>
        <c id="2" size-c="116"/>
        <c id="3" size-c="113"/>
        <c id="4" size-c="121"/>
        <c id="5" size-c="115"/>
        <c id="6" size-c="111"/>
        <c id="7" size-c="123"/>
    </d>

I want to display:
    1
    2
    3
    4
the id attribute of the c nodes that the sum of the size-c attribute be
equal or less than the size-d attribute. How can I do??
Thanks.

    Noelia Crespo





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