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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] RE: ASN.1 is an XML Schema Language (Fix those lists!) and Bin
 Robin Berjon wrote: > There's a lot to say in favour of minimizing the > number of concrete syntaxes, and that's where a > lot of the concerns about having *two* (just two!) > universal formats came from at the binary infosets > workshop. The number of syntaxes isn't important. The only important question is: "Can two systems interoperate?" Well, even if there are hundreds of alternative syntaxes, you can always answer "Yes" to that question by simply making a rule: "Text-based XML must always be supported. All other encodings are optional." This allows "Dual encoding" systems (systems that support both text-based XML and binary encodings to interoperate with *any* other system. It also means that 20 years from now, when someone comes up with some amazing new syntax, my ASN.1 based system will be able to communicate with it by simply changing encoding rules, not abstract syntax. Just as the ASN.1 modules that I wrote back in the early 80's, in a very different world, can be used virtually unchanged today to generate valid XML. If I had defined those old modules in a concrete syntax, I would have to rewrite program logic today, not simply link in the E-XER encoding rules... > The ASN.1 equivalent of a simple XML parser in terms of > universality would have to properly decode (and likely > handle negotiation for) BER, PER, CER, DER, XER, and > probably LWER, OER, and SER. That's a bit of a > behemoth to implement! It may be hard to implement, however, it has been done -- at least for BER, PER, CER, DER, XER, CXER, and E-XER... At least by the commercial suppliers like OSS Nokalva. Once X.694 was finalized, the ambiguities and difficulties related to generating the XML encoders were pretty much eliminated. The result is that the ASN.1 suites can now handle all these encodings with little effort. Yes, building an open source equivelant would be a challenge... But, it is just a question of being "hard." At least there aren't any patent issues like there are with something like "binXML" or the other binary encodings people are inventing these days. bob wyman 
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