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McGuinnessNSF/NCAR October 30, 2002 The Semantic Web (Current State and Directions) Deborah McGuinness Associate Director and Senior Research Scientist.

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Presentation on theme: "McGuinnessNSF/NCAR October 30, 2002 The Semantic Web (Current State and Directions) Deborah McGuinness Associate Director and Senior Research Scientist."— Presentation transcript:

1 McGuinnessNSF/NCAR October 30, 2002 The Semantic Web (Current State and Directions) Deborah McGuinness Associate Director and Senior Research Scientist Knowledge Systems Laboratory Stanford University Stanford, CA USA

2 McGuinnessNSF/NCAR October 30, 2002 Outline Web: today and tomorrow –The key to tomorrow’s web is semantics Semantics on the web requires: –Language for encoding meaning (XML, RDF/S -> DAML+OIL, OWL) –Ontologies (Term descriptions and their interrelationships) –Tools Conclusion and Pointers

3 McGuinnessNSF/NCAR October 30, 2002 Today: Rich Information Source for Human Manipulation/Interpretation Human

4 McGuinnessNSF/NCAR October 30, 2002 “I know what was input” The web knows what text was input (and is great at information dissemination) but does little interpretation, manipulation, integration, and action. Analogous to a new assistant who is thorough yet lacks common sense, context, adaptability, and the ability to interpret for you

5 McGuinnessNSF/NCAR October 30, 2002 Tomorrow: Rich Information Source for Agent Manipulation/Interpretation HumanAgent

6 McGuinnessNSF/NCAR October 30, 2002 “I know what was meant” Understand term meaning and user background Interoperable (can translate between applications) Programmable (thus agent operational) Explainable (thus maintains context and can adapt) Capable of filtering (thus limiting display and human intervention requirements) Capable of executing services

7 McGuinnessNSF/NCAR October 30, 2002 Layer Cake Foundation

8 McGuinnessNSF/NCAR October 30, 2002 Semantic Markup In languages such as OWL, DAML+OIL (http://www.w3.org/2001/sw/WebOnt/, we capture Background info User modeling info for Annotating web pages (man/automatically) Annotating services thereby limiting needs for human disambiguation input, human interpretation, multiple answer display, translation assistance, agent assistance, adaptivity support, etc.) Ontologies DAML/OWL- enabled web pages

9 McGuinnessNSF/NCAR October 30, 2002 DAML/OWL Language Web Languages RDF/S XML DAML-ONT Formal Foundations Description Logics FACT, CLASSIC, DLP, … Frame Systems DAML+OIL OWL OIL Extends vocabulary of XML and RDF/S Rich ontology representation language Language features chosen for efficient implementations

10 McGuinnessNSF/NCAR October 30, 2002 W3C WEBONT catches on…. Includes over 50 members from over 30 international organizations. –Industry including: Large companies such as Daimler Chrysler, EDS, Fujitsu, HP, IBM, Intel, Lucent, Motorola, Nokia, Philips Electronics, Sun, Unisys, … Newer/smaller companies such as IVIS Group, Network Inference, Stilo Technology, Unicorn Solutions, … –Government and Not-For-Profits: Defense Information Systems Agency, Interoperability Technology Association for Information Processing, Japan (INTAP), Intelink Mgt Office, Mitre, ARDA, CIA, DARPA, DIA, NCI, NIH, NIST, NSF, … –Universities and Research Centers: Stanford University, University of Bristol, University of Maryland, University of Southamptom, … DFKI (German Research Center for Artificial Intelligence), Forschungszentrum Informatik –Invited Experts Well-known academics from non-W3C members

11 McGuinnessNSF/NCAR October 30, 2002 OWL Lite Features RDF Schema Features –Class, rdfs:subClassOf, Individual –rdf:Property, rdfs:subPropertyOf –rdfs:domain, rdfs:range Equality and Inequality –sameClassAs, samePropertyAs, sameIndividualAs –differentIndividualFrom Restricted Cardinality –minCardinality, maxCardinality (restricted to 0 or 1) –cardinality (restricted to 0 or 1) Property Characteristics –inverseOf, TransitiveProperty, SymmetricProperty –FunctionalProperty(unique), InverseFunctionalProperty –allValuesFrom, someValuesFrom (universal and existential local range restrictions) Datatypes –Following the decisions of RDF Core. Header Information –imports, Dublin Core Metadata, versionInfo

12 McGuinnessNSF/NCAR October 30, 2002 OWL Features Class Axioms –oneOf (enumerated classes) –disjointWith –sameClassAs applied to class expressions –rdfs:subClassOf applied to class expressions Boolean Combinations of Class Expressions –unionOf –intersectionOf –complementOf Arbitrary Cardinality –minCardinality –maxCardinality –cardinality Filler Information –hasValue Descriptions can include specific value information

13 McGuinnessNSF/NCAR October 30, 2002 OWL Lite and OWL Feature Synopsis: Guide: Reference Description: Abstract Syntax:

14 McGuinnessNSF/NCAR October 30, 2002 Do I have to build the ontologies myself? Maybe not….Ontologies (suitable for reuse) are exploding Upper Level Ontologies –UNSPSC, SUO, OpenCyc, OpenDirectory, TAP, … Specialized Ontologies –UMLS, SNOMED, GO, CIA World Fact book, DAML-S…, even vc’s – Vulcan,… Ontology Libraries –http://www.daml.org/ontologies/ –http://www.ksl.stanford.edu/ontolingua “Advisory” bodies –Semantic Web Science Foundation, NIST, Ontology.org, …

15 McGuinnessNSF/NCAR October 30, 2002 Ontologies in most areas … including the environment Quick web search yielded: Semantic Web for Earth and Environmental Terminology –JPL. National Institute for environmental eScience – Cambridge - Gene Ontology – “dynamic controlled vocabulary that can be applied to all organisms” Design and Creation of Ontologies for Environmental Information Retrieval- Telecordia - Ontologies of environmental applications for a digital library of scientific collections - Waste water ontology – decision support for wastewater treatment processes - Many others …

16 McGuinnessNSF/NCAR October 30, 2002 Tools Tools developing: AnnotationOntology Translation BrowserPersistence CrawlerQuery Tools EditorRDMS Mapping Graph VisualizerReport Generation TransformationSearch ValidatorOntology Analyzer ImporterOntology Editor Inference EngineMerging Many are in research labs, but companies emerging and lasting… Network Inference, Sandpiper, Ontoprise, AppliedSemantics, Sentius, ….

17 McGuinnessNSF/NCAR October 30, 2002 Conclusion/Discussion The Semantic Web is in its infancy today but is ready for applications Markup languages, ontologies, and some tools are ready for use Specialized tools are buildable/usable today Semantic web can be leveraged to support: (items from Tim, Margaret, Dan, David’s presentations): interoperability, modeling, synthesis, integrity checking, prediction, information dissemination, quick start to “poor man’s managed/curated data repositories”, foundation for “richer man’s repository, foundation for new communication mode, distributed collaboration, knowledge mgmt, knowledge from data, “democratizing information”, “build between”, … Input welcome: if you need something from the semantic web community you don’t see, tell us

18 McGuinnessNSF/NCAR October 30, 2002 Some Pointers Ontologies Come of Age Paper: ontologies-come-of-age-abstract.html OWL: DAML+OIL:

19 McGuinnessNSF/NCAR October 30, 2002 Extras

20 McGuinnessNSF/NCAR October 30, 2002 What is an Ontology? Catalog/ ID General Logical constraints Terms/ glossary Thesauri “narrower term” relation Formal is-a Frames (properties) Informal is-a Formal instance Value Restrs. Disjointness, Inverse, part- of…

21 McGuinnessNSF/NCAR October 30, 2002 Stated goals of Semantic Web Define conventions for applications that exchange metadata on the Web Enable vocabulary semantics to be defined by communities of expertise, not W3C or other standards bodies Provide for the fine-grained mixing of diverse metadata Making it cost-effective for people to effectively record their knowledge. Ultimate goal - the design of enabling technologies to support machine facilitated global knowledge exchange

22 McGuinnessNSF/NCAR October 30, 2002 DARPA DAML Program Began in August 2000 Kickoff meeting 19 Research groups supported Initial ontology language aims to extend XML, RDF/S, benefit from frames, benefit from principled KR systems like Description Logics DAML-ONT released in Oct DAML+OIL released in March 2001

23 McGuinnessNSF/NCAR October 30, 2002 DAML+OIL -> W3C W3C Webont working group formed with DAML+OIL submission as starting point Web Ontology Working Group in the W3C Semantic Web Activity aimed at “extending the semantic reach of current XML and RDF meta-data efforts. “W3C Semantic Web Activity

24 McGuinnessNSF/NCAR October 30, 2002 WEBONT cont. Quarterly Face to Face meetings in –Murray Hill: –Amsterdam: –Stanford: –Bristol: –Expected recommendation status at w3c meeting in march. Interesting Documents: –DAML+OIL submission – full spec with reference description, walkthrough, FOL and model theoretic semantics, –Use Case and requirements document:

25 McGuinnessNSF/NCAR October 30, 2002 Contact Information

26 McGuinnessNSF/NCAR October 30, 2002 Some Observations… Markup Languages are growing in acceptance and expressive power User base, tool base, ontology base growing Ontology-enhanced applications springing up (not just in ivory towers like FindUR, eCyc, …)

27 McGuinnessNSF/NCAR October 30, 2002 Simple Ontology-Enhanced Apps

28 McGuinnessNSF/NCAR October 30, 2002


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