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> Is answering Simon Fell's original question about roles  enough to
> deal with this, or is something more powerful needed?
My answer to his question is: I wouldn't try to
come up with a "nature" identifier indicating somehow what's
inside a compound structure. I'd just identify the containing
structure(s) (http://schemas.xmlsoap.org/wsdl/) and let the client
do more discovery work from there.
I don't really like using a namespace identifier to denote
structure, but it's pragmatic. In fact, the piece that is
missing, that I believe could make this resource discovery
thing work in XML land, is a *way* to declare the supposed
"form" or structure of a given piece of data inside a compound
structure. It's tempting to want to assume we can already
infer the form by looking at an element's namespace uri...
yet no one is (officially) willing to say that xml namespaces
are more than a collection of names... no semantics, no structure,
just tokens. If that's the case, I vote for an xml:struct
element for declaring forms, ala:
<ns2:assert>A QName does not assert structure</ns2:assert>
From: Simon St.Laurent [mailto:firstname.lastname@example.org]
Sent: Thursday, January 30, 2003 2:51 PM
To: Xml-Dev@Lists. Xml. Org (E-mail)
Subject: RE: [xml-dev] RDDL and WSDL
email@example.com (Chris Wilper) writes:
>The concept is an API. If it has a URI, great. If it can be
>resolved, excellent. If I get a choice as to what representation of
>the resource I want, even better.
>I'm not sure RDDL is the right thing, as currently scoped
>as a "namespace document" -- but the idea of a resolved URI
>providing an index of descriptive representations of
>a concept/resource ... is appealing.
Interesting, though I'll admit that I cringe any time people map XML
vocabularies directly to APIs.
Is answering Simon Fell's original question about roles  enough to
deal with this, or is something more powerful needed?
I guess I can see RDDL pointing to "here's how to process this stuff"
via WSDL, but worry that WSDL itself specifies something larger than
RDDL, as most Web Services I've seen involve interactions between
multiple (and frequently more than 2) namespaces.
 - http://lists.xml.org/archives/xml-dev/200103/msg00171.html
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Errors, errors, all fall down!
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