scope:

This International Standard defines a scene description format (LASeR) and an aggregation format (SAF) respectively suitable for representing and delivering rich-media services to resource-constrained devices such as mobile phones. LASeR aims at fulfilling all the requirements of rich-media services at the scene description level. LASeR supports: an optimized set of objects inherited from SVG to describe rich-media scenes; a small set of key compatible extensions over SVG; the ability to encode and transmit a LASeR stream and then reconstruct SVG content; dynamic updating of the scene to achieve a reactive, smooth and continuous service; simple yet efficient compression to improve delivery and parsing times, as well as storage size, one of the design goals being to allow both for a direct implementation of the SDL as documented, as well as for a decoder compliant with ISO/IEC 23001-1 to decode the LASeR bitstream; an efficient interface with audio and visual streams with frame-accurate synchronization; use of any font format, including the OpenType industry standard; and easy conversion from other popular rich-media formats in order to leverage existing content and developer communities. Technology selection criteria for LASeR included compression efficiency, but also code and memory footprint and performance. Other aims included: scalability, adaptability to the user context, extensibility of the format, ability to define small profiles, feasibility of a J2ME implementation, error resilience and safety of implementations. SAF aims at fulfilling all the requirements of rich-media