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RE: What are the different schema languages?

• To: "'Bryce K. Nielsen'" <bryce@s...>, <xml-dev@l...>
• Subject: RE: What are the different schema languages?
• From: "Alessandro Triglia" <sandro@m...>
• Date: Wed, 22 Jan 2003 12:58:35 -0500
• Importance: Normal
• In-reply-to: <000701c2c239$da78a7e0$34121eac@beakon>

> -----Original Message-----
> From: Bryce K. Nielsen [mailto:bryce@s...] 
> Sent: Wednesday, January 22, 2003 12:15
> To: xml-dev@l...
> Subject:  What are the different schema languages?
> 
> 
> I'm trying to compile a list of all the different XML schema 
> languages and their specifications out there and can only 
> think of a handful:
> 
>  - XML 1.0 Document Type Definition (DTD) found at 
>  http://www.w3.org/XML/1998/06/xmlspec-report-19980910.htm
>  - W3C's XML Schema Definition (WXS or XSD) found at
http://www.w3.org/XML/Schema
>  - Oasis' RELAX NG found at
http://www.oasis-open.org/committees/relax-ng/
>  - Microsoft's XML Data Reduced schema (XDR) found at >
>http://msdn.microsoft.com/library/default.asp?url=/library/en-us/xmlsdk
30/ht
> m/xmconxmlschemadevelopersguide.asp
>
> Are there any others that I am unaware of?


ASN.1.  The new XML Encoding Rules of ASN.1 are being finalized by the
joint ISO/IEC/ITU-T standards group.  Publication is expected within a
few months.

The language allows the specification of schemas for a wide range of XML
documents.  It takes a different view from other schema languages, in
that it is based on the definition of an abstract data structure, whose
"values" are *encoded* in XML.

One benefit of this model is that the "information content" of an XML
document described by an ASN.1 schema can be immediately encoded in any
of the standard binary Encoding Rules of ASN.1 (such as BER, DER, or
PER) with no effort, as an alternative to XML itself, whenever size is a
concern.  

ASN.1 tools are currently being updated to support the new XML Encoding
Rules.  For application developers having some familiarity with ASN.1,
creating or processing an XML document from an ASN.1-based application
will be as easy as creating or processing a BER message or a PER
message.

For information on ASN.1, see http://asn1.elibel.tm.fr/

Alessandro Triglia
OSS Nokalva
www.oss.com


-BKN


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