Transcript OWL-S - Ontolog

OWL-S:
Brief Overview
David Martin
SRI International
Chair, OWL-S Coalition
Co-chair, Semantic Web Services
Language Committee
DARPA Distribution Statement “A”: Approved for Public Release, Distribution Unlimited
0
What is OWL-S?
• Ontology Web Language for Services
• Under development since early 2001
• An OWL ontology for (formally) describing properties and
capabilities of Web services
• Plus a large body of work about using the ontology:
tools, components, algorithms, extensions
• An approach that draws on many sources
• Description logic, AI planning, Workflow, Formal process modeling, Agents, Web
services, …
• Ties in with Web services (WSDL, UDDI)
http://www.daml.org/services/owl-s
Ontolog Forum; Oct. 20, 2005
1
David Martin: OWL-S Overview
Contributors to OWL-S
(partial list)
BBN: Mark Burstein
CMU: Katia Sycara, Massimo Paolucci, Naveen Srinivasan
De Montfort University: Monika Solanki
Maryland / College Park: Bijan Parsia, Evren Sirin
NIST: Craig Schlenoff
Nokia: Ora Lassila
SRI: David Martin
Stanford KSL: Deb McGuiness
Southampton: Terry Payne
Univ. of Toronto: Sheila McIlraith
USC-ISI: Jerry Hobbs
Yale: Drew McDermott
Ontolog Forum; Oct. 20, 2005
2
David Martin: OWL-S Overview
High-Level Objectives
• Automation of service use by software agents
• Ideal: full-fledged use of services never before
encountered
• Enable reasoning/planning about services
• e.g., On-the-fly composition
• Build on both Semantic Web and Web services
Comprehensive framework supporting the entire
lifecycle of service management tasks
• Discovery, selection, composition, invocation, monitoring, ..
• Integrated use with information resources
• Ease of use (for users and developers)
• Powerful tools
Ontolog Forum; Oct. 20, 2005
3
David Martin: OWL-S Overview
Layered Approach to Language Development
OWL-S: an ontology expressed in OWL and
related languages
OWL-S (Services)
SWRL (Rules)
OWL ([DLP], Light, DL, Full)
RDFS (RDF Schema)
RDF (Resource Description Framework)
XML (Extensible Markup Language)
Ontolog Forum; Oct. 20, 2005
4
David Martin: OWL-S Overview
Upper Ontology of Services
Ontology images compliments of Terry Payne,
University of Southampton
Ontolog Forum; Oct. 20, 2005
5
David Martin: OWL-S Overview
Service Profile: “What does it do?”
High-level characterization/summary of a service
Used for
• Populating service registries
• A service can have many profiles
• Automated service discovery
• Service selection (matchmaking)
One can derive:
• Service advertisements
• Service requests
Ontolog Forum; Oct. 20, 2005
6
David Martin: OWL-S Overview
Service Profile
Ontolog Forum; Oct. 20, 2005
7
David Martin: OWL-S Overview
Service Profile: Styles of use
• Class hierarchical yellow pages
– Implicit capability characterization
– Arrangement of attributes on class hierarchy
– Can use multiple inheritance
– Relies primarily on “non-functional” properties
• Process summaries for planning purposes
– More explicit
– Inputs, outputs, preconditions, effects
– Less reliance on formal hierarchical organization
– Summarizes process model specs
– Relies primarily on functional description
Ontolog Forum; Oct. 20, 2005
8
David Martin: OWL-S Overview
Upper Ontology of Services
Ontolog Forum; Oct. 20, 2005
9
David Martin: OWL-S Overview
Process Model
Ontolog Forum; Oct. 20, 2005
10
David Martin: OWL-S Overview
ProcessService
Model: Model
“How does it work?”
“How does it work?”
Process
– Interpretable description of service provider’s behavior
– Tells service user how and when to interact (read/write messages)
& Process control
– Ontology of process state; supports status queries
– (stubbed out at present)
• Used for:
– Service invocation, planning/composition, interoperation, monitoring
• All processes have
– Inputs, outputs, preconditions and effects
– Function/dataflow metaphor; action/process metaphor
• Composite processes
– Control flow
– Data flow
• “Surface syntax” recently made available
Ontolog Forum; Oct. 20, 2005
11
David Martin: OWL-S Overview
Process of Processes
Input &
Preconditions
•
•
•
•
•
•
•
•
•
•
Output &
Effects
www.acmetravel.com
book travel service
•
•
•
•
•
•
•
•
• confirmation no.
• ...
•
•
•
•
•
•
•
•
•
•
•
• customer name
• location
• car type
• dates
• credit card no.
• ...
www.acmecar.com
?
book car service
• failure notification
•…
• confirmation no.
• ...
• confirmation no.
• dates
• room type
• credit card no.
• ...
• confirmation no.
• ...
• customer name
• flight numbers
• dates
• credit card no.
•
• ...
www.acmehotel.com
book hotel service
?
www.acmeair.com
book flight service
?
• failure notification
•…
?
•
•
•
•
•
•
•
•
• failure notification
• errror information
•…
Ontolog Forum; Oct. 20, 2005
12
David Martin: OWL-S Overview
Upper Ontology of Services
Ontology images compliments of Terry Payne,
University of Southampton
Ontolog Forum; Oct. 20, 2005
13
David Martin: OWL-S Overview
Service Grounding: “How to access it”
• Implementation specific
• Message formatting, transport
mechanisms, protocols, serializations of
types
• Service Model + Grounding give everything
needed for using the service
• Builds upon WSDL
Ontolog Forum; Oct. 20, 2005
14
David Martin: OWL-S Overview
OWL-S / WSDL Grounding
OWL-S
Process Model
Resources/Concepts
Inputs / Outputs
Atomic Process
Message
Operation
Binding to SOAP, HTTP, etc.
WSDL
Ontolog Forum; Oct. 20, 2005
15
David Martin: OWL-S Overview
OWL-S / WSDL Grounding (cont’d)
Ontolog Forum; Oct. 20, 2005
16
David Martin: OWL-S Overview
Some Applications of OWL-S
IBM
–
Provide OWL-S API as part of SNOBASE Semantic Web tool
– http://www.alphaworks.ibm.com/tech/snobase
– Use OWL-S for enhanced semantic UDDI
SAP
–
Use OWL-S for automatic composition of services to manage border control
Toshiba
–
Use OWL-S in publicly available UDDI at NTT (Main Japanese UDDI)
Fujitsu
–
OWL-S used in Task Computing Project; planned for production in 2005
– http://www.taskcomputing.org/
NIST, DCS, TARDEC
–
Use OWL-S to describe capabilities of Autonomous Vehicles
MyGrid
–
Use OWL-S to describe Bioinformatics Web services on the Grid
– http://www.mygrid.org.uk/
AgentCities
–
OWL-S used for discovery of new agents
– http://www.agentcities.org/
Ontolog Forum; Oct. 20, 2005
17
David Martin: OWL-S Overview
Some Areas of Work
Building on OWL-S
•
Architecture / components
–
–
–
–
–
•
Virtual machine
Libraries
Brokering
Mediation
Ontology management (meta-)services
Algorithms / tools
–
Development
• Editors, WSDL2OWLS, BPEL2OWLS, BPEL augmentations
–
Discovery & Selection
– Composition
– UML-based design/generation
•
Ontology extensions
•
•
•
•
•
•
•
Security
Policy
Quality of Service
Domain-specific extensions
Semantic Grid applications
Alternate groundings
SWSF
Ontolog Forum; Oct. 20, 2005
18
David Martin: OWL-S Overview
Summary & Status
• Describes “what it does”, “how it works”, “how to access it”
– Profile, Process, Grounding subontologies
• Ties in fairly naturally with WSDL, UDDI
• Additional semantics supports
– Automation of various Web service tasks
– Varied applications
• W3C member submission
– http://www.w3.org/Submission/2004/07/
• 1.1 release finalized
• 1.2 release planned this year
• Publications, tools, examples
– See http;//www.daml.org/services/owl-s/
– ISWC, WWW, ICSOC conferences (and workshops)
• Additional material (including FLOWS, WSMO, WSDL-S) here:
– W3C Workshop on Frameworks for Semantics in Web Services
– http://www.w3.org/2005/01/ws-swsf-cfp.html
Ontolog Forum; Oct. 20, 2005
19
David Martin: OWL-S Overview