protected function setDefaultConfig() {
		//database prefix
		$this->config['db.prefix'] = '';
	
		//dynamic sql environment id
		$this->config['env.id'] = 'default';
	
		//dynamic sql environment class
		$this->config['env.class'] = 'eMapper\Dynamic\Environment\DynamicSQLEnvironment';
	
		//default relation depth
		$this->config['depth.current'] = 0;
	
		//default relation depth limit
		$this->config['depth.limit'] = 1;
		
		//cache metakey
		$this->config['cache.metakey'] = '__cache__';
	}