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

Re: XSchema Question 3: Internal/External subsets

• From: Paul Prescod <papresco@t...>
• To: xml-dev@i...
• Date: Wed, 03 Jun 1998 08:54:02 -0400

Peter Murray-Rust wrote:
> 
> My understanding is slightly different. The ns= is used to formalise the
> uniqueness and the 'ownership' of the namespace, e.g. xml.org.cml might
> create a global identifier for CML. The src= field does not necessarily
> have to point to the same document globally. 

I'm not sure what you mean here. A particular namespace declaration will
have zero or one srcdef, no matter where on the web it is accessed from.
Rick's point is that it should allow zero or more.

> This is obviously required for
> firewalls, but could also be valuable if the implementation language in the
> src= file could vary (e.g. Perl, Java). Of course it shouldn't act as a
> pseudo-stylesheet mechanism.

I'm not sure that implementation language is the crucial factor. Schemas
will hardly ever be full computer programs, and I would be worried about a
system in which the exact same schema is expressed in two different
languages (especially two different programming languages!). I think that
Rick is referring to different levels and types of schemas...one for
validating the parse tree, one for advanced hyperlinks, one for
knowledge-representation assertions (e.g. RDF Schemas) etc.

The namespaces proposal requires us to choose a single schema as the
"canonical" one as if all of the other levels and types of schemas were
somehow less important.

 Paul Prescod  - http://itrc.uwaterloo.ca/~papresco

Three things are most perilous: Connectors that corrode
Unproven algorithms, and self-modifying code
http://www.geezjan.org/humor/computers/threes.html



xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i...
Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/
To (un)subscribe, mailto:majordomo@i... the following message;
(un)subscribe xml-dev
To subscribe to the digests, mailto:majordomo@i... the following message;
subscribe xml-dev-digest
List coordinator, Henry Rzepa (mailto:rzepa@i...)

• Follow-Ups:
  • Re: XSchema Question 3: Internal/External subsets
    • From: Peter Murray-Rust <peter@u...>

• References:
  • Re: XSchema Question 3: Internal/External subsets
    • From: "W. E. Perry" <wperry@f...>
  • RE: XSchema Question 3: Internal/External subsets
    • From: Peter Murray-Rust <peter@u...>

• Prev by Date: Re: XSchema Question 2: Namespaces
• Next by Date: Re: XSchema and namespaces
• Previous by thread: RE: XSchema Question 3: Internal/External subsets
• Next by thread: Re: XSchema Question 3: Internal/External subsets
• Index(es):
  • Date
  • Thread