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   Re: [xml-dev] Re: Flexible Schemas (was RE: [xml-dev] The task to be sol

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I believe the thrust of Nicolas' question is where to find the RDDL document
for an XML file that utilizes names from multiple namespaces. No one has
proposed a *concrete* answer to that question yet although the designers of
RDDL may consider this to be beyond the design goals of RDDL which is

For instance the following is the first element in an annotated XSD mapping
schema for creating XML views of relational data in SQL server 2000

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema";

The question is where will one locate the metadata/resources/etc for
documents of this type? Or should we be satisfied with a.) everyone MUST use
HTTP URLs for their namespace URIs and b.) everyone must have RDDL information
at these URIs?

What if the developer of this new document type wants to create RDDL
information for this type of document? Do we introduce some new construct, For
instance perhaps a
g-schema" to solve this problem?

So back to Nicolas's question, looking at the source of the document at
http://www.rddl.org I see the following namespace declarations


So what is the algorithm to obtain all (or some) of the metadata related to
the above namespace declarations used in the document at http://www.rddl.org ?
Such as obtaining the W3C XML schema for validating this document or obtain
all the normative references that apply to the document.

If I have several diabolical schemes to destroy the hero, I will set
all of them in motion at once rather than wait for them to fail and
launch them successively.

----- Original Message -----
From: "Elliotte Rusty Harold" <elharo@metalab.unc.edu>
To: <xml-dev@lists.xml.org>
Sent: Saturday, January 19, 2002 1:28 PM
Subject: [xml-dev] Re: Flexible Schemas (was RE: [xml-dev] The task to be
solved by RDDL)

> At 1:55 PM +0100 1/19/02, Nicolas Lehuen wrote:
> >As I've said three of four times now, show me the algorithm that will find
> >the URL of the RDDL document for this document : http://www.rddl.org/. This
> >is a FONDAMENTAL problem with RDDL.
> Ummm, load http://www.rddl.org?
> If that's too simple, here's a two-step algorithm:
> 1. Parse the document at http://www.rddl.org/ to find all namespace
> URIs used in that document.
> 2. Load each one.
> You do realize that the document at http://www.rddl.org/ is the RDDL
> document for the http://www.rddl.org/ namespace, right?
> Your terminology is a little off, which is why I ask. There is no
> such thing as a RDDL document for any document, only RDDL documents
> for namespace URIs which may be used in various documents.
> --
> +-----------------------+------------------------+-------------------+
> | Elliotte Rusty Harold | elharo@metalab.unc.edu | Writer/Programmer |
> +-----------------------+------------------------+-------------------+
> |          The XML Bible, 2nd Edition (Hungry Minds, 2001)           |
> |              http://www.ibiblio.org/xml/books/bible2/              |
> |   http://www.amazon.com/exec/obidos/ISBN=0764547607/cafeaulaitA/   |
> +----------------------------------+---------------------------------+
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