Here you might define JavaScript code to be processed.

You can access the properties of the current object in the following way:

var x = data.get('xxx');

You can access 1:1 mapped sub objects in the following way:

var so = data.get('SUBOBJECT');
var x = so.get('xxx');

You can access 1:n mapped sub objects in the following way:

var sos = data.get('SUBOBJECTS');
for (var i=0; i<sos.size(); i++)
{
    var so = sos.get(i);
    var x = so.get('xxx');
}

You can write new properties into the current object in the following way:

data.put('yyy','Some value of yyy.');