return a collection of sources that have been changed . concode_field_sep ArrayList<Source> added concode_elem_sep ArrayList<Source> removed concode_elem_sep ArrayList<SourceContainer> removedContainers concode_elem_sep ArrayList<Source> changed concode_field_sep void removed concode_elem_sep void added concode_elem_sep void removedContainer concode_elem_sep boolean isEmpty concode_elem_sep List<Source> getAdded concode_elem_sep List<Source> getRemoved concode_elem_sep List<SourceContainer> getRemovedContainers concode_elem_sep void changed
List < Source > function ( ) { return changed ; }