return array(
    'item' => array(
        'serializer-factory-callback' => function( SerializerFactory $serializerFactory ) {
            return $serializerFactory->newItemSerializer();
        },
        'deserializer-factory-callback' => function( DeserializerFactory $deserializerFactory ) {
            return $deserializerFactory->newItemDeserializer();
        },
        'change-factory-callback' => function( array $fields ) {
            return new ItemChange( $fields );
        }
        // entity-factory-callback? pls get rid of that
    ),
    'property' => array(
        'serializer-factory-callback' => function( SerializerFactory $serializerFactory ) {
            return $serializerFactory->newPropertySerializer();
        },
        'deserializer-factory-callback' => function( DeserializerFactory $deserializerFactory ) {
            return $deserializerFactory->newPropertyDeserializer();
        },
        'change-factory-callback' => function( array $fields ) {
            return new EntityChange( $fields );
        }
    )
);