[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message]

Re: ASN.1 and XML

• From: "Thomas B. Passin" <tpassin@h...>
• To: xml-dev@l...
• Date: Mon, 28 May 2001 10:18:49 -0400

[Al Snell]

> 1) It's currently mandatory in ASN.1 that types have names starting with a
> capital letter, and values with a small letter. sually, value names map to
> XML element names - the things compromising an Address-typed element are
> called street city, and postcode so the elements are named after that,
> not "String". This is fine when you're encoding something with ASN.1 roots
> in XML, but how does that cope with an existing XML schema using capital
> letters on things that you convert to ASN.1? The case-of-first-letter
> thing will probably be dropped from "requirement" to "stylistic
> recommendation".
>

Yes, the case/naming can be a little iffy for automated processing.  Those
lower-case slots are really type labels too, as I understand it, aren't
they?  They will be assigned values in an instance but they are types in the
schema.  The difference is that they are locally-defined type labels whose
scope is limited, and they are used to define the type of a slot, not to
name an entire type definition.

BTW, Al, maybe you're the one to answer this, I've been wondering about it.
In view of the mandatory upper/lower case naming requirements, how can
someone create ASN.1 labels in a language that does not make that
distinction?  Or are you simply not allowed to name types using such
characters at all (which isn't so good for internationalization, I would
thnk)?

Cheers,

Tom P

• Follow-Ups:
  • Re: ASN.1 and XML
    • From: Olivier Dubuisson <Olivier.Dubuisson@f...>

• References:
  • Re: ASN.1 and XML
    • From: Al Snell <alaric@a...>

• Prev by Date: Re: Para element ??
• Next by Date: Re: Namespace: what's the correct usage?
• Previous by thread: Re: ASN.1 and XML
• Next by thread: Re: ASN.1 and XML
• Index(es):
  • Date
  • Thread