Re: xml-dev Digest 21 Mar 2002 20:57:39 -0000 Issue 213
> [Alaric Snell] > > > On Thursday 21 March 2002 02:05, Thomas B. Passin wrote: > > > > > Otherwise we > > > might as well use asn.1 as an informal schema language to indicate > > > structure and constaints (this is not a slur against asn.1, BTW, for it > > > could do a good part of the schema job of indicating structure pretty > > > well). > > > > [cough, ahem] *informal*? With the addition of XML as an ASN.1 encoding > > ruleset, ASN.1 can now be used as an XML schema language :-) > > > > And good to hear from you, too, Alaric! You mean it's official now, or just > that the wirk has stabilized and is chugging through the official approval > process? X.693 (XER Encoding Rules) has been approved on Dec. 22, 2001. It is pre-published at: http://www.itu.int/ITU-T/studygroups/com17/languages/X.693_0901.pdf > Is there a link to the final version? I saw an earlier one, but > don't think I have a link for it anymore. The XML notation for ASN.1 values is mainly defined in X.680:2002 (X.693 is referencing that standard). Before the end of July, the 2002 edition of the ASN.1 standard will be pre-published (and will be free on the ITU-T website). The current *very stable* drafts (we are not allowed to make technical changes) are at: http://asn1:notation1@t.../ftp/asn1 In other words, the work *is* stable and XER tools have been announced (http://asn1.elibel.tm.fr/links/#xml) We're now working on XCN (XER Control Notation), a notation that allows the user to tune the XER generated by default. You might want to have a look at the presentation at: http://asn1.elibel.tm.fr/xml/ASN1-and-XML.htm Another big advantage of ASN.1 as a schema notation for XML is IMHO its associated canonical XER encoding (CXER). More information at: http://asn-1.com/cxer.zip -- Olivier DUBUISSON france telecom R&D DTL/TAL - 22307 Lannion Cedex - France t: +33 2 96 05 38 50 - f: +33 2 96 05 39 45 - http://asn1.elibel.tm.fr/
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