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David Martin for DAML-S Coalition 05/08/2003
OWL-S:Bringing Services tothe Semantic Web
David Martin
http://www.daml.org/services/
David Martin for DAML-S Coalition 05/08/2003
These slides will be available here:
www.daml.org/services/materials/swmu
and will be linked from the SWMU Agenda page
David Martin for DAML-S Coalition 05/08/2003
Acknowledgements
Material on “Why Semantic Web Services”
and on “Commercial Web Services”
borrowed from a ISWC 2002 tutorial
presentation with kind permission from
Dieter Fensel (U. of Innsbruck) &
Christoff Bussler (Oracle)
David Martin for DAML-S Coalition 05/08/2003
Outline Overview & Background
Why Semantic Web Services? Commercial Web Services
WSDL, UDDI, SOAP, …
OWL-S Technical Overview Profile, Process & Grounding ontologies Next Steps & Future Directions
SWSI, SWSL & SWSA
Resources & Building Blocks Applications, Tools, Components
David Martin for DAML-S Coalition 05/08/2003
Convergence on Services• Commercial vendors, media, forecasters, etc.
– Intranets, not just internets
• W3C Web services efforts• Semantic Web community
– DAML-S/OWL-S; WSMF & other EU efforts– ISWC 2002: 10 services-related papers, 7 posters
• Grid computing (OGSA)• Ubiquitous computing (devices)
– Mobile access to services
A remarkable opportunity– Bringing behavioral intelligence to the Web
David Martin for DAML-S Coalition 05/08/2003
URI, HTML, HTTPStaticWWW
500 million usersmore than 3 billion pages
Why Semantic Web Services?T
hanks to Dieter F
ensel (U. of Innsbruck)
for use of this material
David Martin for DAML-S Coalition 05/08/2003
URI, HTML, HTTPStaticWWW
Serious Problems in information•finding
•extracting•representing•interpreting
•and maintaining
RDF, RDF(S), OWLSemantic Web
Why Semantic Web Services?T
hanks to Dieter F
ensel (U. of Innsbruck)
for use of this material
David Martin for DAML-S Coalition 05/08/2003
Static
Dynamic
Bringing the computer back as a device for computation
URI, HTML, HTTP RDF, RDF(S), OWL
WWW Semantic Web
UDDI, WSDL, SOAP
Web Services
Why Semantic Web Services?T
hanks to Dieter F
ensel (U. of Innsbruck)
for use of this material
David Martin for DAML-S Coalition 05/08/2003
Bringing the web to its full potential
Static
Dynamic UDDI, WSDL, SOAP
Web Services
URI, HTML, HTTP RDF, RDF(S), OWL
WWW Semantic Web
Intelligent Web Services
Why Semantic Web Services?T
hanks to Dieter F
ensel (U. of Innsbruck)
for use of this material
David Martin for DAML-S Coalition 05/08/2003
“Web services are a new breed of Web application. They are self-contained, self-describing, modular applications that can be published, located, and invoked across the Web. Web services perform functions, which can be anything from simple requests to complicated business processes. …Once a Web service is deployed, other applications (and other Web services) can discover and invoke the deployed service.”
IBM web service tutorial
Commercial Web Services: Definition
David Martin for DAML-S Coalition 05/08/2003
• Business services can be completely decentralized and distributed over the Internet and accessed by a wide variety of communications devices.
• The internet will become a global common platform where organizations and individuals communicate among each other to carry out various commercial activities and to provide value-added services.
• Dynamic enterprise and dynamic value chains become achievable and possibly even mandatory for competitive advantage.
Commercial Web Services:Business Vision
David Martin for DAML-S Coalition 05/08/2003
Commercial Web Services:Emerging Standards
URI HTML HTTP
UDDI WSDL SOAP
David Martin for DAML-S Coalition 05/08/2003
Commercial Web Services
The web is organized around URIs, HTML, and HTTP.
• URIs provide defined ids to refer to elements on the web,
• HTML provides a standardized way to describe document structures (allowing browsers to render information for the human reader), and
• HTTP defines a protocol to retrieve information from the web.
==> Not surprisingly, web services require a similar infrastructure around UDDI, WSDL, and SOAP.
David Martin for DAML-S Coalition 05/08/2003
Commercial Web Services
• UDDI provides a mechanism for clients to find web services.
• A UDDI registry is similar to a CORBA trader, or it can be thought of as a DNS service for business applications.
• White pages: Who is the service provider?• Yellow pages: What is the service providing?• Green pages: How can I make use of the
service?
David Martin for DAML-S Coalition 05/08/2003
Commercial Web Services
• WSDL defines services as collections of network endpoints or ports.
• The abstract definition of endpoints and messages is separated from their concrete network deployment or data format bindings.
• The concrete protocol and data format specifications for a particular port type constitute a binding.
• A port is defined by associating a network address with a binding; a collection of ports define a service.
David Martin for DAML-S Coalition 05/08/2003
Commercial Web Services
• SOAP is a message layout specification that defines a uniform way of passing XML-encoded data.
• In also defines a way to bind to HTTP as the underlying communication protocol.
• SOAP is basically a technology to allow for “RPC over the web”.
David Martin for DAML-S Coalition 05/08/2003
Sweet Spot: Matchmaking
From “Web Services Architecture W3C Working Draft”http://www.w3.org/TR/2002/WD-ws-arch-20021114/
Commercial Web Services:Basic Architecture
David Martin for DAML-S Coalition 05/08/2003
Commercial Web Services:Summary
• UDDI, WSDL, and SOAP are important steps into the direction of a web populated by services.
• However, they only address part of the overall stack that needs to be available in order to achieve the above vision eventually.
• Essentially, syntax and communication.• More is required to maximize reasoning & automation
of Web service provision & use across the WS lifecycle– Development, discovery, selection, composition, monitoring,
mediation, execution, monitoring & recovery, etc.