code: public int getWeight() {
          if (tc.isEntryEnabled())
              SibTr.entry(this, tc, "getWeight");
          if (tc.isEntryEnabled())
              SibTr.exit(this, tc, "getWeight");
          // TODO: this probably isn't a good value.
          return 0;
      }
docs: Get the weighting to use for this discriminator