code: public static String[] getDataTypesName()
      {
          Set<String> dataTypeNames = new HashSet<String>();
          for(Datatype datatype : miriam.getDatatype()) {
          	dataTypeNames.add(datatype.getName());
          }
          return dataTypeNames.toArray(ARRAY_OF_STRINGS);
      }
docs: Retrieves the list of preferred names of all the data types available.
  
  @return list of names of all the data types