add a high level change renaming . if the difference group identifier already exists the old high level change renaming will be overwritten . concode_field_sep HashMap<String,HighLevelChangeRenaming> highLevelChangesRenaming concode_field_sep void removeHighLevelChangeRenaming concode_elem_sep HashMap<String,HighLevelChangeRenaming> getHighLevelChangesRenaming concode_elem_sep void clear concode_elem_sep void setHighLevelChangesRenaming