what is the name of the compressed format of the camera manufactured by olympus, and has a weight less than 530.0?
(AND digicams.camera_compressed_format (JOIN digicams.camera_compressed_format.cameras (AND (lt digicams.digital_camera.weight 530.0^^http://www.w3.org/2001/XMLSchema#float) (JOIN digicams.digital_camera.manufacturer m.0fqsd))))