code: @Override
     public ConfigurationRuleBuilder addRule(Rule rule)
     {
        RuleBuilder wrapped = null;
        if (rule instanceof RuleBuilder)
           wrapped = (RuleBuilder) rule;
        else
           wrapped = RuleBuilder.wrap(rule);
  
        rules.add(wrapped);
        setDefaultLocation(wrapped);
        return new ConfigurationRuleBuilder(this, wrapped);
     }
docs: Add a {@link Rule}.