what is the compression format used by cameras with a 16:9 ratio weighing less than 455.0?
(AND digicams.camera_compressed_format (JOIN (R digicams.digital_camera.compressed_formats) (AND (le digicams.digital_camera.weight 455.0^^http://www.w3.org/2001/XMLSchema#float) (JOIN (R digicams.camera_image_ratio.cameras) m.022qdb2))))