Transcript Tutorial_C_Part_1

OWL-S:
Bringing Services to
the Semantic Web
David Martin
SRI International
[email protected]
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
Why Semantic Web Services?
WWW
Static
URI, HTML, HTTP
David Martin for DAML-S Coalition
Thanks to Dieter Fensel (U. of Innsbruck)
for use of this material
500 million users
more than 3 billion pages
05/08/2003
Why Semantic Web Services?
WWW
Static
URI, HTML, HTTP
David Martin for DAML-S Coalition
Semantic Web
RDF, RDF(S), OWL
Thanks to Dieter Fensel (U. of Innsbruck)
for use of this material
Serious Problems in information
•finding
•extracting
•representing
•interpreting
•and maintaining
05/08/2003
Why Semantic Web Services?
Dynamic UDDI, WSDL, SOAP
WWW
Static
URI, HTML, HTTP
David Martin for DAML-S Coalition
Semantic Web
RDF, RDF(S), OWL
Thanks to Dieter Fensel (U. of Innsbruck)
for use of this material
Web Services
Bringing the computer
back as a device for
computation
05/08/2003
Why Semantic Web Services?
Web Services
Dynamic UDDI, WSDL, SOAP
WWW
Static
URI, HTML, HTTP
David Martin for DAML-S Coalition
Intelligent Web
Services
Semantic Web
RDF, RDF(S), OWL
Thanks to Dieter Fensel (U. of Innsbruck)
for use of this material
Bringing the web to its full potential
05/08/2003
Commercial Web Services:
Definition
“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
David Martin for DAML-S Coalition
05/08/2003
Commercial Web Services:
Business Vision
• 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.
David Martin for DAML-S Coalition
05/08/2003
Commercial Web Services:
Emerging Standards
UDDI
WSDL
SOAP
URI
HTML
HTTP
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
Commercial Web Services:
BasicSweet
Architecture
Spot: Matchmaking
From “Web Services Architecture W3C Working Draft”
http://www.w3.org/TR/2002/WD-ws-arch-20021114/
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.
David Martin for DAML-S Coalition
05/08/2003