* @return the {@link SpeciesTypeState} that has the given id or null if
* no {@link SpeciesTypeState} are found that match {@code id}.
*/
public SpeciesTypeState getSpeciesTypeState(String id) {
if (isSetListOfSpeciesTypeStates()) {
return listOfSpeciesTypeStates.firstHit(new NameFilter(id));
}
return null;
}