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

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Alaric B Snell wrote:
> Simon St.Laurent wrote:
> > If some aspect of ASN.1 can cover mixed content and open content 
> > models, I'm happy to welcome it to my regular list of XML schema 
> > languages. Otherwise, I'll be happy to continue promoting 
> ASN.1 as an 
> > _alternative_ to XML, albeit one with ASN.1->XML->ASN.1 
> > interoperability.
> > 
> > (It's the anyXML->ASN.1->anyXML part that seems to remain a 
> problem.)
> There's an ASN.1 type for the Infoset... meaning, one ASN.1 
> schema that 
> covers any XML document. Useful for simple arbitrary-XML 
> compression by 
> reading XML and outputting a PER representation of the 
> infoset. Run the 
> result of that through GZip to compress the text parts and it gets 
> pretty small!

Let me clarify.  The "ASN.1 Schema for the Infoset" is part of the X.695
work.  It is not (yet) used in X.693 (EXTENDED-XER) nor in X.694.

The current support for the content-model wildcard in EXTENDED-XER, as I
said in a previous message, consists in a character string type with an
[ANY-ELEMENT] encoding instruction, which contains any XML element.  The
current X.694 mapping translates each WXS content-model wildcard into an
ASN.1 UTF8String with an [ANY-ELEMENT] encoding instruction.

As the X.695 work matures, it is expected that the "ASN.1 Schema for the
Infoset" will be used in X.693/X.694, but this will take some time.


> > I also wish there were open source tools for ASN.1 that 
> just reported 
> > the contents of an ASN.1 message, more like the open-ended approach 
> > that XML parsers have generally taken.
> > 
> > There could be some very cool stuff there.
> Yeah... the shortage of ASN.1 tools sucks. There's some really lovely 
> tools you can pay for, but that situation locks out 
> experimenters, open 
> source folks, etc.
> Who's up for a project to build an open source ASN.1 toolkit?
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