Re: [ubl-lcsc] ISSUE: Nesting and Containership within Schema

[John Larmouth <j.larmouth@salford.ac.uk>]

I gave a presentation on ASN.1 as an XML schema notation at the last MoU
MG (Jon was there).  I am hoping I may be able to give a more technical
presentation at the Burlington meeting to avoid important people in UBL
work saying in the future "Never heard of ASN.1"!  (Not getting at Eve! 
Would I dare?)

John L


> "CHIUSANO, Joseph" wrote:
> 
> Here's some info on ASN.1:
> 
> ASN.1 XER (Abstract Syntax Notation One XML Encoding Rules),
> International Telecommunications Union (ITU)
> http://asn1.elibel.tm.fr/xml/
> 
> - ASN.1 has been an international standard since 1984.  It is a formal
> notation used for describing data transmitted by telecommunications
> protocols, regardless of language implementation and physical
> representation of these data.
> 
> - Due to its streamlined encoding rules, ASN.1 is also reliable and
> ideal for wireless broadband and other resource-constrained
> environments.There is more than one set of encoding rules that can be
> applied to values of ASN.1 types.
> 
> - This Recommendation | International Standard defines two sets of
> encoding rules that use the Extensible Markup Language (XML). These
> are called the XML Encoding Rules (XER) for ASN.1, and both produce an
> XML document compliant to W3C XML 1.0. The first set is called the
> Basic XML Encoding Rules.
> 
> - The second set is called the Canonical XML Encoding Rules because
> there is only one way of encoding an ASN.1 value using these encoding
> rules. (Canonical encoding rules are generally used for applications
> using security-related features such as digital signatures.)
> 
> Hope this helps,
> Joe
> 
> >
> **************************************************************************
> 
> >   Joseph M. Chiusano
> >   Logistics Management Institute
> >   2000 Corporate Ridge
> >   McLean, VA 22102
> >   Email: jchiusano@lmi.org
> >   Tel: 571.633.7722
> >
> **************************************************************************
> 
> >
> 
> -----Original Message-----
> From: Eve L. Maler [mailto:eve.maler@sun.com]
> Sent: Thursday, August 08, 2002 10:25 AM
> To: j.larmouth@salford.ac.uk
> Cc: Ubl-Lcsc
> Subject: Re: [ubl-lcsc] ISSUE: Nesting and Containership within Schema
> 
> Thanks for the info; I'm not very familiar with ASN.1.  It will be
> great
> if we can create additional schema representations for the UBL Library
> 
> that take advantage of expressiveness not available in XSD (they all
> have slightly-to-very different powers).  However, since XSD is our
> normative schema format of record, we would need to indicate the
> constraint in another fashion in that case.
> 
>         Eve
> 
> John Larmouth wrote:
> > You can specify that trivially if you use ASN.1 as the schema
> definition
> > notation:
> >
> >       Root ::= SEQUENCE {
> >          el1  .....
> >          el2  SEQUENCE {
> >                 f1    ..... OPTIONAL,
> >                 f2    ..... OPTIONAL,
> >                 f3    ..... OPTIONAL} (EXCEPT {}) OPTIONAL,
> >          e12  ..... }
> >
> > John L
> 
> --
> Eve Maler                                        +1 781 442 3190
> Sun Microsystems                            cell +1 781 883 5917
> XML Web Services / Industry Initiatives      eve.maler @ sun.com
> 
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-- 
   Prof John Larmouth
   Larmouth T&PDS Ltd
   (Training and Protocol Development Services)
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