Can't get graphical mapping to work - subelements

Question

Hello,
I'm new to SAP XI, and I'm struggling with a graphical mapping.
This is what I have in the source message schema:
<Root>
  <Group>             (occurrance 1..1)
     <A>              (occurrance 1..n)
        <Value>       (occurrance 1..1)
        <B>           (occurrance 0..n)
           <Value>    (occurrance 1..1)
So element "A" can have possible 0, 1 or more subelements "B".  Element A has always a subelement "Value", and if B occurs, every occurrance of B has also a subelement "Value".
The purpose of the mapping is: if there are "B" subelements, then map the "Value" subelement of B to the target message element (and this for each "B" subelement). If there are no "B" subelements, then map the "Value" subelement of A to the target message element.
The example message instance I have is:
<Root>
  <Group>
    <A>
       <Value>test1</Value>
    </A>
    <A>
       <Value>test2</Value>
       <B>
         <Value>test3</Value>
       </B>
       <B>
         <Value>test4</Value>
       </B>
    </A>
    <A>
       <Value>test5</Value>
    </A>
  </Group>
</Root>
This would have to be mapped to a target result which looks like this:
<Results>
   <Records>
      <Result>test1</Result>
      <Result>test3</Result>
      <Result>test4</Result>
      <Result>test5</Result>
   </Records>
</Results>
(as you probably already remarked, the "test2" value should not be mapped to the target, because the A-parent element has B subelements, so the values should be taken from that element.)
I already tried several things and combinations (exists node function, splitbyvalue,...) that I found on the forum, but I don't succeed in creating the correct structure.
Can you guys help me ? Thank you very much in advance !
(I marked this thread as a question so I can reward the answers)
Kindly,

Answer 1

This is my exampel to loop over a special node and to find out a special value inside this node or to find a special subnode. In this case i have to search in the node "PARAM1" similar to your "A" that a subnode or special Value is existing
Maybe this code is helpful to get your solution.
Create a Queue Function with parameters (string).
Beware: It´s only an idea !
//write your code here
int i = 0;
i = PARAM1.length;
boolean WEExist = false;
//result.clear();
// loop over PARAM1 and find a special value or //subnode:in_this_case_insert_PARAM2_instead_of_equals_to_constant_WE
for (int j = 0; j<i; j++)
                    if( PARAM1[j].equals("WE"))
     WEExist = true;
     result.addValue("trueWE");
if( WEExist == false)
     result.addValue("falseWE");
You can work with this result to get the "value" from "A" or "B".
Note: you have to use the removecontext after the UDF in the Graphical mapping.
I hope you can use this simple UDF to get an idea for your solution.
Regards,
Gordon
Message was edited by:
        Gordon Breuer