code: public void addRule(TransliterationRule rule) {
          ruleVector.add(rule);
          int len;
          if ((len = rule.getAnteContextLength()) > maxContextLength) {
              maxContextLength = len;
          }
  
          rules = null;
      }
docs: Add a rule to this set.  Rules are added in order, and order is
  significant.
  @param rule the rule to add