David Martin for DAML-S Coalition 05/08/2003 OWL-S: Bringing Services to the Semantic Web David Martin SRI International

David Martin for DAML-S Coalition 05/08/2003 These slides will be available here: 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, HTTP Static WWW 500 million users more than 3 billion pages Why Semantic Web Services? Thanks to Dieter Fensel (U. of Innsbruck) for use of this material

David Martin for DAML-S Coalition 05/08/2003 URI, HTML, HTTP Static WWW Serious Problems in information finding extracting representing interpreting and maintaining RDF, RDF(S), OWL Semantic Web Why Semantic Web Services? Thanks to Dieter Fensel (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, HTTPRDF, RDF(S), OWL WWW Semantic Web UDDI, WSDL, SOAP Web Services Why Semantic Web Services? Thanks to Dieter Fensel (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, HTTPRDF, RDF(S), OWL WWW Semantic Web Intelligent Web Services Why Semantic Web Services? Thanks to Dieter Fensel (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 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.