Mapping element from a different line item

Question

Hi Experts,
I have a structure that looks like this,
LINE
line1
  item1
  item2
line2
  item1
  item2
line3
  item1
  item2
and the target structure will look like this,
SEGMNT
line1
  item1
  item2
line2
  item1
  item2
line3
  item1
  item2
Now, if item2 in line1 of source is missing then I want to map item2 of line2 of source to item2 of line1 of target. Please let me know how to go about this?
Thanks,
Dhawal

Answer 1

Hi,
I will add payloads here to explain the situation in more detail.
Source Payload
<class>
<student>
  <name>ABC</name>
  <grade></grade>
</student>
<student>
  <name>XYZ</name>
  <grade>A</grade>
</student>
<student>
  <name>PQR</name>
  <grade>B</grade>
</student>
</class>
Current Target Payload
<Target_class>
<student>
  <name>ABC</name>
  <grade></grade>
</student>
<student>
  <name>XYZ</name>
  <grade>A</grade>
</student>
<student>
  <name>PQR</name>
  <grade>B</grade>
</student>
</Target_class>
Required Target Payload
<Target_class>
<student>
  <name>ABC</name>
  <grade>A</grade>          // Here, grade A shoube be picked up from next student (XYZ)
</student>
<student>
  <name>XYZ</name>
  <grade>A</grade>
</student>
<student>
  <name>PQR</name>
  <grade>B</grade>
</student>
</Target_class>
Now I understand that I need to write UDF for this, the question is HOW? Please guide me in this direction.'
Thanks,
Dhawal