xml to xml mapping - how to combine two groups

I'm not sure how to add to a thread so I'm listing my original question
to be sure. I've added a note at the bottom.

I'm receiving XML data with two different groups of elements. Let's call
them GROUP-A and GROUP-B.

I need to merge the two into single groups of elements. I may have more
of one group than the other.

For example:  I may receive 3 occurrences of GROUP-A and 2 occurrence of
GROUP-B. I want my resulting XML to have 3 occurrences of a new group.
The first two occurrences would contain the elements from both GROUP-A
and GROUP-B. The third occurrence would only contain the elements from
GROUP-A because GROUP-A had one more occurrence than GROUP-B.

Example 2:    2 occurrences of GROUP-A and 6 occurrences of GROUP-B. My
resulting xml should have 6 occurrences of a new group. The first two
would contain elements from both GROUP-A and GROUP-B. The remaining 4
occurrences would contain the elements from the last 4 occurrences of
GROUP-B.

Below is an example of some date.

<LIST_GROUP_A>
<GROUP_A>
<COLOR>red</COLOR>
</GROUP_A>
</LIST_GROUP_A>
<LIST_GROUP_B>
<GROUP_B>
<SHAPE>round</SHAPE>
</GROUP_B>
<GROUP_B>
<SHAPE>square</SHAPE>
</GROUP_B>
</LIST_GROUP_B>

I need to map these into one grouping.
I would like the result to be something like:

<LIST_COMBINED>
<COMBINED>
<COLOR>red</COLOR>
<SHAPE>round</SHAPE>
</COMBINED>
<COMBINED>
<SHAPE>square</SHAPE>
</COMBINED>
</LIST_COMBINED>

The result needs to have two occurrences of COMBINED. The first contains
the first occurrences of GROUP_A and GROUP_B. The second contains the
second occurrence of GROUP_B.

I sure do hope I've explained this.

Thanks! Andy


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