returns the field name which was used to transform the content if process row has modified the content and null otherwise . concode_field_sep String endLoopDirective concode_elem_sep String fieldName concode_elem_sep String itemNameList concode_elem_sep String startLoopDirective concode_elem_sep String content concode_field_sep String getContent concode_elem_sep String getItemNameList concode_elem_sep String getStartLoopDirective concode_elem_sep String getEndLoopDirective
String function ( ) { return fieldName ; }