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Semantic Web ServicesSemantic Web Services
Sem
antic Web enabled
Web S
ervices
Semantic Web enabled Web Services (SWWS)IST project presentation
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Contents1. The Vision
2. State of the Art
3. Semantic Web enabled Web Services (SWWS)
4. Ontoweb
5. Integrated Project in Framework VI
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URI, HTML, HTTPStaticWWW
500 million usermore than 3 billion pages
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ervicesThe Vision
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URI, HTML, HTTPStaticWWW
Serious Problems in information•finding
•extracting•representing•interpreting
•and maintaining
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RDF, RDF(S), OWLSemantic Web
The Vision
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Static
Dynamic
Bringing the computer back as a device for computation
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URI, HTML, HTTP RDF, RDF(S), OWL
WWW Semantic Web
UDDI, WSDL, SOAP
Web Services
The Vision
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Bringing the web to its full potential
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antic Web enabled
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Static
Dynamic UDDI, WSDL, SOAP
Web Services
URI, HTML, HTTP RDF, RDF(S), OWL
WWW Semantic Web
Intelligent Web Services
The Vision
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Vision & Truth
Def 1. Software Architecture
Def 2. New concept for eWork and eCommerce
Def 3. New programming technology
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Def 1. Web Services as a Software Architecture “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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ervicesThe Vision
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Web Services connect computers and devices with each other using the Internet to exchange data and combine data in new ways.
The key to Web Services is on-the-fly software creation through the use of loosely coupled, reusable software components.
Software can be delivered and paid for as fluid streams of services as opposed to packaged products.
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ervicesThe Vision
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Def 2. Web Services as a new Concept for eWork and eCommerce
„Web Services, are Services accessible via the web“
Dieter Fensel, private definition
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ervicesThe Vision
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• 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.
• The dynamic enterprise and dynamic value chains become achievable and may be even mandatory for competitive advantage.
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ervicesThe Vision
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• Large companies shrink around their core competencies.
• Vica versa, virutal enterprises are set up on the fly reflecting current marketr needs.
eWork and eCommerce will be the two sides of the same coin.
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ervicesThe Vision
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Def 3. Web Services as a programming technology
„Web Services are Remote Procedure Calls (RPC) over HTTP“
current state of the art
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ervicesThe Vision
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2 State of the Art
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.
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State of the Art Sem
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URI HTML HTTP
UDDI WSDL SOAP
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State of the Art
• 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.
• There are many layer requires to achieve automatic web service discovery, selection, mediation and composition into complex services.
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State of the Art
• Document Structure
• Semantics
• Process definition
• Exchange sequence definition
• Transport binding
• Security
• Trust
• Etc. ...
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State of the Art
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Layer / Standard
Document type
Process
Exchange Sequence
Packaging
Transport binding
Semantics
EDI
X
X
RosettaNet
X
X
X
X
X
X
ebXML
X
X
X
X
SOAP
X
X
OAGIS
X
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State of the Art
• Web services can be accessed and executed via the web.
• However, all these service descriptions are based on semi-formal natural language descriptions.
• Therefore, the human programmer need be kept in the loop and scalability as well as economy of web services are limited.
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State of the Art
• There are important steps to take to bring web services and fully enabled E-commerce to reality.
• Bringing E-commerce to its full potential requires a Peer-to-Peer (P2P) approach. Anybody must be able to trade and negotiate with everybody else.
• However, such an open and flexible E-commerce has to deal with many obstacles before it becomes reality!
• The issue is scalability and economy in price.
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State of the Art
• We identify the following elements necessary to enable efficient inter-enterprise execution: – Mechanized process description and advertisement; – Mechanized discovery of services; – Mechanized selection of services; – Mechanized composition of services; – and mechanizde delivery, monitoring and contract
negotiation.• Without mechanization of these processes, internet-
based E-commerce will not be able to provide its full potential in economic extensions of trading relationships.
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State of the Art Sem
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Making WS a mature technology by adding additional layers of funtionality
Making WS a
(1) mature,
(2) scalable, and
(3) cost effective
technology.
Making WS a automized technology by adding semantic web technology
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A new IST project will start in August 2002 on Semantic Web enabled Web Services (SWWS) in line with the mentioned ideas.
Partners are:• Vrije Universiteit Amsterdam, NL (coordinator)• FZI Karlsruhe, Germany• Hewlett-Packard, UK• iSOCO, Spain• Ontotext, Bulgaria• Oracle, U.S.A.
Sem
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SWWS
Over 60 industrial in the advisory board:
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1st SWWS meeting: Sardinia, Italy, Friday, June 14, 2002.
Jointly with the 1st International Semantic Web Conference (ISWC) and Ontoweb.
Sem
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The main objectives of SWWS are:• Provide a comprehensive Web Service
description framework.• Define a Web Service discovery
framework.• Provide a scalable Web Service
mediation.
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• Fully enabled E-commerce based on workable web services requires a modeling framework that is centered around two complementary principles:
– Strong de-coupling of the various components that realize an Ecommerce application. This de-coupling includes information hiding based on the difference of internal business intelligence and public message exchange protocol interface descriptions.
– Strong mediation service enabling anybody to speak with everybody in a scalable manner. This mediation service includes the mediation of different terminologies as well as the mediation of different interaction styles.
Sem
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ervicesThe Web Service Modeling
Framework (WSMF)
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The WSMF consists of four main different elements:
– ontologies that provide the terminology used by other elements;
– goal repositories that define the problems that should be solved by web services;
– web services descriptions that define various aspects of a web service;
– and mediators which bypass interoperability problems.
ontologiesontologies
mediatorsmediators
web
ser
vice
sw
eb s
ervi
ces
repo
sito
ries
repo
sito
ries
The Web Service Modeling Framework (WSMF)
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• Service and process definition is based on the modelling language WSMF with semantic capabilities.
• Service discovery using these semantic descriptions is the first step towards the composition/orchestration of services/processes to form a dynamic solution.
• The Service Discovery Framework describes the overall approach and architecture for semantic-driven discovery of services.
Sem
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• Focused Service Crawling Algorithm: Developing focused crawling techniques supporting the process of detecting services on the Web for a given set of preferences.
• Implementation of the Service Discovery Framework: The framework for Service Discovery is implemented, including algorithms for focused crawling.
Sem
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• The main objective is the construction of a highly dynamic mediation framework that allow an automatic and fast cooperation between corporations.
• This framework will consider semantic access to processes and data, extending the Web Service paradigm to include Semantic features and developing a Agent architecture over Web Services using the P2P nature of the Internet.
Sem
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• These paradigms extend the concept of Semantic Web from the use of static resources to the use of dynamic services.
• It accomplish the agent purposes, allowing the automatic orchestration, matching and composition of the represented processes and services.
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• Extension of basic financial aggregation services developed as commercial aggregators to a broader set of operations.
• A demonstration platform will be developed which will address the decomposition of (complex) e-services into discrete components (e.g. web services) and the practical implications of assembling these into a realisable system.
Sem
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Sem
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4. OntoWeb: 4. OntoWeb: A Key Enabler for E-Commerce & A Key Enabler for E-Commerce &
Knowledge ManagementKnowledge Management
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OntoWeb
• EU funded Thematic Network
• 3 years: June 2001 to May 2004
Homepage: www.ontoweb.org
Mailing list: [email protected]
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OntoWeb: OntoWeb: THE Thematic Network for THE Thematic Network for
Semantic WebSemantic Web
The focal pointThe focal point for bringing together for bringing together activities in the area of ontology-based activities in the area of ontology-based
methods and tools for the Semantic Web.methods and tools for the Semantic Web.
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Ontoweb
• Ontoweb has a Special Interest Group (SIG) on Semantic Web Services.
• Regularly meetings, mailing list, web page.• Collecting point for European projects in this
area.• Focus point for US cooperation (DAML-S).
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Where to enjoy the Semantic Web Where to enjoy the Semantic Web Summer??Summer??
You shouldn’t miss!!You shouldn’t miss!!Semantic Web Summer Package:Semantic Web Summer Package:-- location: Sardinia, Italylocation: Sardinia, Italy- duration: June 10-14- duration: June 10-14- free gift: OTK dissemination workshop- free gift: OTK dissemination workshop- iswc.semanticweb.org- iswc.semanticweb.org
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• We run an initiative for a large integrated project within Framework VI of the European funding.
• Semantic Web Services will be its backbone element.• The financial frame will be between 10 and 100
Million Euro.• In case you may be interested please feel free to talk
with me.
Sem
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ervices5. Integrated Project in
Framework VI
