code: public char match(String str1, String str2) {
          if (str1 == null || str2 == null)
              return IMappingElement.IDK;
          if (str1.equals(str2)) {
              return IMappingElement.EQUIVALENCE;
          } else
              return IMappingElement.IDK;
      }
docs: Computes relation with synonym matcher
  
  @param str1 the source string
  @param str2 the target string
  @return synonym or IDK relation