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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.
Alessandro
>
> > 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?
>
> ABS
>
>
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