Create nested field with XPath

[cadoman]

I almost have the same problem.
But I'm not sure that this solution could work for me :

Use of Split Filter for more than 1 fields, it is possible

The split filter acts on a single field. You can use a ruby filter to join the elements of each array into another array so that you have this: { ... "field_to_split": [ ["A", "E", "W", "Q"], ... ] } Then feed field_to_split to a split filter, and use another filter or two to split the array back into discrete fields.

Right after the XML filter my fields look like this :

"Parameter" : {
   "EngValue" : ["1.0", "GCOM", "1.0"],
   "DecValue" : ["1.0", "1.0"]
 }

And I can't just join the elements of each array : For each element of "EngValue", I don't know the corresponding element in "DecValue" (since "DecValue" is optional).
I could do it if I had this after the XML filter :

"Parameter" : {
   "EngValue" : ["1.0", "GCOM", "1.0"],
   "DecValue" : ["1.0",   ""  , "1.0"]
 }

Please notice that I don't want to split my values in multiple events. I want to put them in a "Parameter" array ("Parameter" is a nested object).