protected $_classes = [
		'entity' => 'lithium\data\entity\Document',
		'set' => 'lithium\data\collection\DocumentSet',
		'result' => 'lithium\data\source\mongo_db\Result',
		'schema' => 'lithium\data\source\mongo_db\Schema',
		'exporter' => 'lithium\data\source\mongo_db\Exporter',
		'relationship' => 'lithium\data\model\Relationship',
		'manager' => 'MongoDB\Driver\Manager'
	];