Processing multiple lists

Hello,

I have a document madeup of 3 lists of nodes that looks something like
this...

<list1>
        <node1 id=1>....stuff....</node>
        <node1 id=1>....stuff....</node>
        ...
        <node1 id=N>....stuff....</node>
</list1>
<list2>
        <node2 id=1>....stuff....</node>
        <node2 id=1>....stuff....</node>
        ...
        <node2 id=N>....stuff....</node>
</list2>
<list3>
        <node3 id=1>....stuff....</node>
        <node3 id=1>....stuff....</node>
        ...
        <node3 id=N>....stuff....</node>
</list3>

I have some transforms I want to apply to the document based on the
content stored in list2.  However, I also want to do some processing on
list1 and list3 based upon what happens in list2.  For instance, if I
add a node to list2 at position N-1, I want to add a new node to lists1
and lists3 and the same for deleting a node at the same position.

It occurs to me that while processing the contents of list1 and list3, I
could just test the contents of list2 to see if some action is required.
However, it seems wasteful to me to run the same test three times.

Is there someway I could store the results of testing so that I could
use it while processing each list?

Thanks,

Matt

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