[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Abbreviated Tag Names (ASN.1)
Olivier Dubuisson has kindly filled us in on the progress of an asn.1-xml relationship. This is very good news, indeed. > Moreover this argument is a kind of dead circle: ASN.1 is not used in > *some* areas because no free tools are available, and no free tools are > available because ASN.1 is not used in the areas where people usually > write free tools. Anyway I think that things will change, for there are > a bunch of companies which are going to work together on the promotion of > ASN.1, and I agree with you that providing free tools is a good way to > promote a technology. (I give some more elements on this topic below.) > Html and xml have spread much faster into fairly general use than asn.1 did in its early life (or even now, perhaps :-) ). I believe that the ease of authoring, the availability of low cost (or free) browsers, and the number of readily available programming tools has had a lot to do with this. Of course, the availability of the Internet had something to do with it too! So your news here is very good. > > > - There's no standard way to translate between asn.1 and xml, and their data > > models are not fully congruent. > > Here I say: "not yet"! > The ASN.1 Project from ITU-T is actually working (jointly with ISO) on 2 > initiatives: > 1. an XML value notation for ASN.1 types (or "ASN.1 Markup Language") that > allow to write values by way of an XML markup whose tags are derivated > from the ASN.1 type names. > Such an XML value notation can appear in an ASN.1 module, and can be > used to display ASN.1 values with an XML browser. > When appended with an XML document header and footer, this value notation > turns into what could be called "XML Encoding Rules for ASN.1". This will > be a standard named ITU-T Recommendation X.693 | ISO/IEC 8825-4. > I'm eagerly awaiting a URL. I trust good progress has been made beyond last year's (non-ITU) XML Encoding Rules that were being worked on. > 2. an XML Schema to ASN.1 mapping that keeps all the information contained > in an XML Schema and translates it into equivalent ASN.1 types and subtype > constraints. You can then use ASN.1 standardized encoding rules such as > DER (that allow digital signatures and encryption, for example) or PER (to > very efficiently transmit data over a radio channel, for example), as well as > associated ASN.1 tools, for data that are defined in XML. > This will be a standard named ITU-T Recommendation X.694 | ISO/IEC 8825-5. > This will be very nice to have! Thanks for taking the time to post your information here, Olivier. Regards, Tom Passin
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