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',
		'server'       => 'MongoClient'
	];