Structure Mapping Question Selected node copying

Question

Dear experts,
I would like to know the following. I have an Idoc to xml-file scenario. The xml is provided. There are for each row in the idoc a number of similar segments (1..unbounded). I want to copy only those segments if they have a particular value, this is always one segment from this header, can never be more with the same value in VAL. Like this:
Source:
<HEADER>
  <SEGMENT>
    <XAL>555</XAL>
    <VAL>name one</VAL>
  </SEGMENT>
  <SEGMENT>
    <XAL>666</XAL>
  </SEGMENT>
  <SEGMENT>
    <XAL>777</XAL>
    <VAL>name three</VAL>
  </SEGMENT> 
</HEADER>
As a result I want to map only the value from VAL where in that same segment XAL=777
So:
<TARGETHEADER>
   <VAL>name three</VAL>
</TARGETHEADER>
How do I accomplish this?
Kind regards.

Answer 1

Auke,
As said by patrick use IF Without ELSE.
Do the logic,
XAL & Constant(777) -
>equals----->IF Without else -
>Target
Choose equals function under Text category.
raj.