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   Re: [xml-dev] ASN.1 is an XML Schema Language (Fix those lists!)and Bina

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> Bancroft Scott wrote:

> You're missing the point, the operative word being "universality". An 
> XML parser can successfully read anything produced based on an XML 
> schema language (not to mention all that can be done without any schema) 
> -- unless that schema language is ASN.1 (which could be an argument for 
> saying it isn't exactly an XML schema language).

I read this part of the thread differently.  The point, I think, was that 
there would be a default encoding, and others could be used by negotiation.
A parser would only have to be able to decode the default, and that would be
used if negotiation disclosed that either side could only do the default.

So if the default were xml, we would get full interop the same as we do now.
No need for a parser to have to decode all those other encodings.


Tom P

> If all you have is an ASN.1 schema, and you're on the receiving side, 
> you don't know what you're going to get. If it's an ER you don't know 
> about you won't read it. That just won't happen if you're using XML. You 
> can chose to consider this unimportant, but a lot of us XML folks think 
> it is a core asset.
> IIRC there was a good passage in Olivier Dubuisson's ASN.1 book about 
> how a decoder must know so much, unfortunately I can't find it right now.
> > By the way, LWER, OER and SER are not standard encoding rules of ASN.1.
> > LWER was a proposal from about a decade ago that was withdrawn by the
> > submitter before being progressed.  OER was created in the automotive
> > community but did not catch on.  This is the first that I am hearing
> > about SER.
> Yes I know, which is why I set them aside in the list. SER (Specific 
> Encoding Rules for signalisation) is an FT and Nokia joint spec and 
> operates things like RNIS and GSM. It is not unrelated to the old work 
> on MBER.
> -- 

> Robin Berjon <robin.berjon@expway.fr>
> Research Scientist, Expway      http://expway.com/
> 7FC0 6F5F D864 EFB8 08CE  8E74 58E6 D5DB 4889 2488
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