code: public String gaRuleIdentifyer(final AbstractRule rule) {
      final String plainName = RuleNames.getRuleNames(rule).getUniqueRuleName(rule);
      return this.toJavaIdentifier(plainName, true);
    }
docs: Creates an identifier for a Rule which is a valid Java idetifier and unique within
  the Rule's grammar.
  @param rule the Rule
  @return the identifier