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Does the Semantic Web = RDF? I don't think Semantic Web
equals Web Services but they have some bits in common.
Of course, one might note the use of standard taxonomies,
registries, inspection of services of a given
provider, all expressed in XML in the Web Service
spec offerings. One should note that UDDI "yellow pages" enables
industrial categories based on standard taxonomies such as
the North American Industry Classification System and the
Standard Industrial Classification
It may be the case that regardless of the use of an
RPC model for services, the rest of this works a
lot like parts of a semantic web and the fray is over
the specifications themselves. That is, XML Schema,
WSDL, SOAP, UDDI and XML vocabularies in messages are all
these folks want to start with. Then they want to
build over those baseline specifications with specs
for the semantics they clearly define in terms of
the XML vocabularies.
Looking at the Global Web Service Specs (MS and IBM): (the following
is abstracted from the MSDN:
o WS-Inspection - inspection of a site for available services
- collection of rules for how inspection-related information should be made available
- means for aggregating references to pre-existing service description
documents that have been authored in any number of formats.
- inspection documents are made available at the point-of-offering of the services
as well as through references, which may be placed within a content medium such as HTML.
o WS-License - a set of commonly used license types (credentials that are signed assertions)
- Encode X.509 certificates and Kerberos tickets as well as arbitrary binary credentials.
Includes extensibility mechanisms
o WS-Referral - protocol that enables the routing strategies used by SOAP nodes in a message path to be
dynamically configured. A configuration protocol that enables SOAP nodes to delegate part or all of
their processing responsibility to other SOAP nodes.
o WS-Routing -stateless, SOAP-based protocol for routing asynchronous SOAP messages in an manner over
a transports like TCP, UDP, and HTTP.
- entire message path for a SOAP message (as well as its return path) described within the SOAP envelope.
- Supports one-way messaging, two-way messaging such as request/response and peer-to-peer conversations, and
long running dialogs.
o WS-Security -a security language for Web services: credential exchange, message integrity, and message confidentiality.
> Patrick Stickler wrote:
> > What we need is a global metadata registry (or registries)
> > that provides access to knowledge by arbitrary URI, which
> > is expressed in standardized ontologies with consistent
> > semantics -- ideally expressed in RDF.
> > You know, something like a Semantic Web... ;-)
> Yes, we badly need it.