code: function(compa, compb) {
      if(compa == null) {
          expect(compb == null);
      } else if(compa.token && compa.token === "uri") {
          expect(compa.token).toBe(compb.token);
          expect(compa.value).toBe(compb.value);
      } else if(compa.literal) {
          expect(compa.literal).toBe(compb.literal);
      } else if(compa.blank) {
          expect(compa.blank).toBe(compb.blank);
      } else {
          expect(false);
      }
  }
docs: Auxiliary functions