<?php
  
  namespace Sabberworm\CSS\Property;
  
  use Sabberworm\CSS\Comment\Commentable;
  use Sabberworm\CSS\Renderable;
  
  interface AtRule extends Renderable, Commentable
  {
      /**
       * Since there are more set rules than block rules,
       * we’re whitelisting the block rules and have anything else be treated as a set rule.
       *
       * @var string
       */
      const BLOCK_RULES = 'media/document/supports/region-style/font-feature-values';
  
      /**
       * … and more font-specific ones (to be used inside font-feature-values)
       *
       * @var string
       */
      const SET_RULES = 'font-face/counter-style/page/swash/styleset/annotation';
  
      /**
       * @return string|null
       */
      public function atRuleName();
  
      /**
       * @return string|null
       */
      public function atRuleArgs();
  }