----- Original Message ----
> From: Duane Nickull <dnickull@xxxxxxxxx>
> To: Pat Hayes <phayes@xxxxxxx>; Alan Ruttenberg <alanruttenberg@xxxxxxxxx>
> Cc: Jonathan Rees <jar@xxxxxxxxxxxxxxxxxxx>; [ontolog-forum]
><ontolog-forum@xxxxxxxxxxxxxxxx>
> Sent: Tuesday, 22 January, 2008 5:01:58 PM
> Subject: Re: [ontolog-forum] CL, CG, IKL and the relationship between symbols
>in the logical "universe of discourse" and individuals in the "real world"
>
> Here is some information:
>
>
> On 1/22/08 8:37 AM, "Pat Hayes" wrote:
>
> > Well, Im not the authority in this area, but I gather that the
> > official W3C position on the semantics of URIs is that there is a
> > single entity, called a 'resource' (which may be "virtual")
> > identified by each URI (or, in modern parlance, each #-free IRI).
>
> The Web Services Architecture work ( http://www.w3.org/TR/ws-arch/) has a
> slightly different notion of how this works:
>
> "The semantics of a Web service is the shared expectation about the behavior
> of the service, in particular in response to messages that are sent to it.
> In effect, this is the "contract" between the requester entity and the
> provider entity regarding the purpose and consequences of the interaction."
>
> Note here that "Service" has been strictly types as a specialized type of
> "Resource". In W3C terms, A "resource" is defined by [RFC 2396] to be
> anything that can have an identifier. I find this somewhat disturbingly
> ambiguous as anything can have an indentifier.
>
> RFC 2396 ( http://ietf.org/rfc/rfc2396.txt) states " A Uniform Resource
> Identifier (URI) is a compact string of characters for identifying an
> abstract or physical resource."
>
> It goes on to read " Resource
> A resource can be anything that has identity. Familiar
> examples include an electronic document, an image, a service
> (e.g., "today's weather report for Los Angeles"), and a
> collection of other resources. Not all resources are network
> "retrievable"; e.g., human beings, corporations, and bound
> books in a library can also be considered resources.
>
> The resource is the conceptual mapping to an entity or set of
> entities, not necessarily the entity which corresponds to that
> mapping at any particular instance in time. Thus, a resource
> can remain constant even when its content---the entities to
> which it currently corresponds---changes over time, provided
> that the conceptual mapping is not changed in the process."
> (01)
YE
Also relation to resources as described in Web Services Architecture. (02)
The key here is that Resources are “owned” by an individual or organization
and that ownership (or guardianship) allows for rules (“policies”) applied
to the resource which govern none, some or all of the aspects of the resources
life cycle; security access, management, etc. "A resource is something that can
be owned and therefore have policies applied to it.". Depending on the role of
the resource, in the interaction between requester and provider, the policy set
for the resource will govern it's behaviour "Policies applying to resources are
relevant to the management of Web Services". So ownership and policy govern
part of the context of interaction. (03)
Further in relation to context, a resource has a “representation” which
describes the state of the object at a given time. The state will, partly, be
a reflection of the policies that were applied to it when it was accessed by
the requestor. “the resource associated with the booking state of a
restaurant will have different representations depending on when the
representation is retrieved.” URI’s are the means to access the state of
the resource, “A representation is usually retrieved by performing an HTTP
“GET” on a URI”. (04)
>
> Note that TimBL noted the relativity of time as an important characteristic
> for identifying resources.
>
> Duane
>
> --
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