About XML Compression and MPEG-7
Dear All, Regarding the compression aspect of XML, i would like to mention that currently MPEG experts are working on a standard (MPEG-7) about audiovisual metadata carriage and processing. In MPEG-7 metadata are expressed in XML. XML Schema is used to define datastructures. A large library of types are defined to describe many aspect of a multimedia document ranging from low level features (colors, movement, etc..) to high level description (RDF like). XML descriptions can be sent as a whole or synchronously streamed within the AV stream (MPEG-2 or MPEG-4). In MPEG-7, XML can be easily encoded, streamed, and filtered. For that purpose MPEG-7 designed a binary encoding format very similar to what you are suggesting and to ASN-1 (but far more XML oriented). The codec is dynamically generated based on the schema expressed in XML Schema. It accepts every XML Schema features like substitutionGroups, sub-typing, choices, sequences, aso... Compression ratios show that elements can be represented by few bits in average (sometimes less than one bit), values are coded using specific datatype encodings. Best regards, Claude. -- ______________________________________________ Claude Seyrat Expway c/o Acland 18 avenue Georges V 75008 Paris tel: 33 1 56 62 11 05 fax: 33 1 56 62 11 11 mail: cseyrat@a...
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