OWL-S: Bringing Services to the Semantic Web

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OWL-SBringing Services tothe Semantic Web

• David Martin
• SRI Internationalmartin_at_ai.sri.com
• http//www.daml.org/services/

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• These slides will be available here
• www.daml.org/services/materials/swmu
• and will be linked from the SWMU Agenda page

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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)
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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

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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

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Why Semantic Web Services?
Thanks to Dieter Fensel (U. of Innsbruck)for use
of this material
500 million users more than 3 billion pages
WWW
URI, HTML, HTTP
Static
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Why Semantic Web Services?
Thanks to Dieter Fensel (U. of Innsbruck)for use
of this material

• Serious Problems in information
• finding
• extracting
• representing
• interpreting
• and maintaining

WWW
URI, HTML, HTTP
Static
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Why Semantic Web Services?
Thanks to Dieter Fensel (U. of Innsbruck)for use
of this material
Bringing the computer back as a device for
computation
Dynamic
WWW
Semantic Web
URI, HTML, HTTP
RDF, RDF(S), OWL
Static
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Why Semantic Web Services?
Thanks to Dieter Fensel (U. of Innsbruck)for use
of this material
Bringing the web to its full potential
Web Services
UDDI, WSDL, SOAP
Dynamic
WWW
Semantic Web
URI, HTML, HTTP
RDF, RDF(S), OWL
Static
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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

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Commercial Web ServicesBusiness 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.

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Commercial Web ServicesEmerging Standards
SOAP
WSDL
UDDI
HTTP
HTML
URI
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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.
• gt Not surprisingly, web services require a
  similar infrastructure around UDDI, WSDL, and
  SOAP.

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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?

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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.

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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.

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Sweet Spot Matchmaking
Commercial Web ServicesBasic Architecture
From Web Services Architecture W3C Working
Drafthttp//www.w3.org/TR/2002/WD-ws-arch-200211
14/
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Commercial Web ServicesSummary

• 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.