docs: public Set<String> getSupportedTypes(){
  		Set<String> typeset = new HashSet<String>();
  		Set<String> set = factory.DefaultLabelAlphabet().toSet();
  		Iterator<String> itt = set.iterator();
  		while(itt.hasNext()){
  			String type = itt.next();
  			if(type.length() ==1 )
  				continue;
  			typeset.add(type.substring(1));
  		}
  		return typeset;
  	}