[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] RE: XML Binary Characterization WG public list available
Dennis Sosnoski wrote: > I'm well aware of Infoset-based encodings, since my > own XBIS project (http://www.xbis.org) is one of > them. I was curious how ASN.1 deals with data at > the Infoset level, rather than schema-specific versions. I'm not an expert in these matters, however, it appears to me that the "Fast Infoset" approach is actually very similar to the approach of XBIS. Basically, there is an ASN.1 schema that defines tags for various elements of the Infoset (elements, attributes, unparsed entities, processing instructions, comments, etc.) and there is a mechanism to insert new text strings into a "dictionary" as you pass through the document and replace them with integer "handles" like in XBIS. You can find an early (and now out-of-date) discussion of the approach in the OSS Nokalva paper that was submitted to the Binary XML Workshop.[1] As I understand it, the current approach and schema is much simpler and more efficient than what was presented to the Workshop also, there is a good bit of effort being put into it to make sure that the final schema works well with SAX... BTW: For anyone interested in the mapping of XSD to ASN.1, the standard is now available on the web[2]. bob wyman [1] See: Appendix A: http://www.w3.org/2003/08/binary-interchange-workshop/32-OSS-Nokalva-P osition-Paper-updated.pdf [2] X.694, ASN.1 encoding rules - mapping W3C XML schema definitions into ASN.1: http://www.itu.int/ITU-T/studygroups/com17/languages/X.694-0401.pdf
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