Message Mapping: Parent should only appear if child exists

Question

Hi,
i have a message structure like
root
   structure 0-unbounded
      field1    0-1
      field2    0-1
I want to create the same output structure, but if field1 doent exist, the parent structure shouldnt appear. Sounds very simple, but the my problem is: however i map field1 to structure, either directly or with functions like exists() or ifWithOutElse() it allways give me the wrong structure.
For example:
<root>
   <structure>
      <field2>10</field2>
   </structure>
   <structure>
      <field1>20</field1>
      <field2>30</field2>
   </structure>
   <structure>
      <field2>40</field2>
   </structure>
</root>
mapped with field1 (context to root) -> structure gives me as result
<root>
   <structure>
      <field2>10</field2>
   </structure>
</root>
I would like to have:
<root>
   <structure>
      <field1>20</field1>
      <field2>30</field2>
   </structure>
</root>
Thx 4 ur help,
Udo

Answer 1

Hi Satish,
thx for posting
I checked your solution, but i got the same result, may be i understood something wrong.
>I changed the occurence of your mapping to 0..unbouned in mapping.
I dont understand that. Are you talking about a multi mapping?
>For root in target: field1(change context to root in source) > removecontext>exists>creatif>root
The root is of course occurence 1, so i dont need to map it, right?
>For Strucurte in target: field1 > removecontext>exists-->creatif -->Strucurte
I tried to map the structure like you recommended. It should now give ONLY structures where the child field1 exists. This works, if the first structure has such a child, but not in my example. I get the wrong structure.
Do you think i need to use node functions as well for field1 or field2? Can they appear in a wrong structure?
Regards,
Udo