Semanlink - NTIC ; Semantic technology AND Semantic Web Dev

Very good presentation at WWW 2008. Nominated for the best paper award<br/>
Abstract: Applications of semantic technologies often require the representation of and reasoning with structured objects—that is, objects composed of parts connected in complex ways. Although OWL is a general and powerful language, its class descriptions and axioms cannot be used to describe arbitrarily connected structures. An OWL representation of structured objects can thus be underconstrained, which reduces the inferences that can be drawn and causes performance problems in reasoning. To address these problems, we extend OWL with description graphs, which allow for the description of structured objects in a simple and precise way. To represent conditional aspects of the domain, we also allow for SWRL-like rules over description graphs. Based on an observation about the nature of structured objects, we ensure decidability of our formalism. We also present a hypertableau-based decision procedure, which we implemented in the HermiT reasoner. To evaluate its performance, we have extracted description graphs from the GALEN and FMA ontologies, classified them successfully, and even detected a modeling error in GALEN.

2008-04-23 About

Nodalities: Google App Engine and the Joy of WebArch

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2008-04-14 About

GRDDL in OwlSight | Thinking Clearly

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2008-04-11 About

Lost Boy: Writing an ARQ Extension Function

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2008-04-01 About

MyCarEvent - Terminology and Methodology for populating the generic information model

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MyCarEvent

2008-01-20 About

RDF Net API

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2008-01-09 About

UserRequirements - owl1-1 - Google Code

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2008-01-08 About

Joseki - A SPARQL Server for Jena

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Joseki

2008-01-04 About

ARQ - Querying Remote SPARQL Services

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2008-01-04 About

MYCAREVENT: OWL and the automotive repair information supply chain - Proceedings of Extreme Markup Languages®

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MyCarEvent

2007-10-05 About

OWL 1.1 Web Ontology Language Overview

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OWL 1.1

2007-09-19 About

Submission Request to W3C: OWL 1.1 Web Ontology Language

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2007-09-19 About

OWL Web Ontology Language Guide

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2007-09-19 About

Applications Built on Jena - Tom Heath's Displacement Activities - by tomheath

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2007-08-22 About

bobdc.blog: Some great W3C explanations of basic ontology concepts

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2007-08-06 About

CO-ODE

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2007-07-26 About

SKOS Extensions [RDF/OWL Description]

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2007-07-18 About

Jena GRDDL Reader

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Jena GRDDL Reader

2007-07-17 About

NG4J - Named Graphs API for Jena

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NG4J

2007-07-13 About

"Semantic Web Technologies in Technical Automotive" - CEUR-WS.org/Vol-258 - OWL: Experiences and Directions 2007

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2007-07-13 About

CEUR-WS.org/Vol-258 - OWL: Experiences and Directions 2007

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OWLED 2007

2007-07-13 About

ARQ - SPARQL Tutorial

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2007-07-07 About

SDB - Jena wiki

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SDB: A SPARQL Database for Jena

2007-07-02 About

P2NotesOwled2007 - owl1-1 - Google Code

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OWLED 2007 AND fps

2007-06-29 About

S1NotesOwled2007 - owl1-1 - Google Code

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OWLED 2007 AND fps

2007-06-29 About

owl1-1 - Google Code

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2007-06-27 About

OWLED 2007 - LeibnizWiki

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OWLED 2007 AND fps

2007-06-23 About

Structured Ontology Format

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2007-06-07 About

OWLED 2007 Program

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OWLED 2007

2007-06-04 About

RDFa support in Jena GRDDL Reader (SVN)

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2007-05-31 About

EasyChair. Login Page for OWLED 2007

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OWLED 2007

2007-05-05 About

jena-dev : Message: Re: [jena-dev] Checking URI validity before adding it to a model

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2007-04-25 About

Search RDF data with SPARQL (and Jena)

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2007-04-20 About

An OWL model for managing ontologies in the agricultural domain

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2007-04-02 About

OWL: Experiences and Directions - OWLED 2007

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OWLED 2007

2007-03-04 About

Horst, Herman J. ter: Completeness, decidability and complexity of entailment for RDF Schema and a semantic extension involving the OWL vocabulary

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We prove that entailment for RDFS (RDF Schema) is decidable, NP-complete, and in P if the target graph does not contain blank nodes.We show that the standard set of entailment rules for RDFS is incomplete and that this can be corrected by allowing blank nodes in predicate position. We define semantic extensions of RDFS that involve datatypes and a subset of the OWL vocabulary that includes the property-related vocabulary (e.g. Functional- Property), the comparisons (e.g. sameAs and differentFrom) and the value restrictions (e.g. allValuesFrom). These semantic extensions are in line with the 'if-semantics' of RDFS and weaker than the 'iff-semantics' of D-entailment and OWL (DL or Full). For these semantic extensions we present entailment rules, prove completeness results, prove that consistency is in P and that, just as for RDFS, entailment is NP-complete, and in P if the target graph does not contain blank nodes. There are no restrictions on use to obtain decidability: classes can be used as instances.

2007-02-06 About

ProtegeWiki: Modeling Tips And Tricks

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2006-12-23 About

On the properties of metamodeling in OWL

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Abstract: A common practice in conceptual modeling is to separate the intensional from the extensional model. Although very intuitive, this approach is inadequate for many complex domains, where the borderline between the two models is not clear-cut. Therefore, OWL-Full, the most expressive of the Semantic Web ontology languages, allows combining the intensional and the extensional model by a feature we refer to as metamodeling. In this paper, we show that the semantics of metamodeling adopted in OWL-Full leads to undecidability of basic inference problems, due to free mixing of logical and metalogical symbols. Based on this result, we propose two alternative semantics for metamodeling: the contextual and the HiLog semantics. We show that SHOIQ— a description logic underlying OWL-DL— extended with metamodeling under either semantics is decidable. Finally, we show how the latter semantics can be used in practice to axiomatize the logical interaction between concepts and metaconcepts.
<br/><br/>
Eagle is a type of RedListSpecies. Thus, RedListSpecies acts as a
metaconcept for Eagle
<br/>
The examples such as the one given above are often dismissed with an argument that “eagle as a species” and “eagle as a set of all individual eagles”
are not the one and the same thing, and should not be referred to using the
same symbol...we simply observe that the word “eagle” in most people’s minds invokes a notion of a “mighty bird of prey.” The interpretation of
this notion as a concept or as an individual is secondary and is often context-dependent, so using different symbols for the same intuitive notion makes the
model unnecessarily complex.

2006-12-01 About

PR-OWL: A Bayesian Framework for the Semantic Web

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2006-11-07 About

Jena on Sourceforge

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2006-11-06 About

PR-OWL: A Bayesian Ontology Language for the Semantic Web

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2006-09-07 About

The ultimate mashup -- Web services and the semantic Web

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