Stanford DB Seminar 991112 Data semantics, modeling and ontologies: new frontiers in databases

11/24/99


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Table of Contents

Stanford DB Seminar 991112 Data semantics, modeling and ontologies: new frontiers in databases

Overview

Caveat Emptor

“Make me a basketball website” . --a Gedankenexperiment

(Declarative) Semantics

Semantics in Information Systems

Semantics in Information Systems

Semantics in Information Systems

Proof vs. Model

Ontology = Conceptualization

Example: WordNet (Miller et al.)

Example: WordNet

Problems with current lexicons

Example: CYC (Lenat & Guha)

An “intensional” ontology: KIF

Domain/Application Ontology

Computerized ontologies: Applications

Ontology in the Corporation

Example: “ontologize” databases (part of DOGMA Project)

Example: RosettaNet Partnership

Example: RosettaNet

“Ontologization” of an application, of a domain, of an everything

PPT Slide

SAP glossary --parsed into lexons version A note! presently requires serious manual assist :-(

SAP glossary --parsed into lexons version B note! requires even more manual assist

Example of Ontology creation and use

Ontology Formalisms

Extensional Ontology

Intensional Ontology (Guarino ‘98)

Intensional Ontology

Intensional Ontology

Intensional (Language-) Ontology

Universal Ontology

Intensional ?link? Extensional

Ontology design & tools

DOGMA: Ontologies + Agents

Ontologies + Agents

DOGMA Ontology Server

Ontology Design Methodology?

Dynamic self-organization in DOGMA

The Roles of Roles

Example: Object-Role Modeling (ORM: was “NIAM”)

Meta modeling

Q: what goes into ontology?

Q: indeed e.g. consider an entry,

Example: the XOL meta model (Karp, Chaudhri & Thomere ’99)

XOL meta model (cont’d)

XOL meta model (cont’d)

Open Information Model (OIM)

OIM Knowledge Description Model (redone in ORM)

Knowledge Description Model (Terms)

Adding context to the OIM model

Adapted meta-model: situating “context”

Context tree: representation

Context example: tree levels

Context example: tree node

The Ontology Grail

Author: Robert Meersman