72,884 research outputs found
How to represent meanings in an ontology
We work on a method for giving a formal semantic representation of natural language texts. The semantic representation is generated in an ontology, on the basis of morphological and syntactic information. The task of the semantic analysis is to create instances in the ontology that contains the world model, i.e. to create those individuals and relations that correspond to the situation described by the text. The knowledge base of the semantic analyser is stored in an OWL ontology. This paper gives an overview of the system, and we discuss those questions of ontology design that require special attention in the context of meaning representation. We also present a software prototype that is based on the method and generates electronic medical records from free-form medical texts
Le terme et le concept : fondements d'une ontoterminologie
Most definitions of ontology, viewed as a "specification of a
conceptualization", agree on the fact that if an ontology can take different
forms, it necessarily includes a vocabulary of terms and some specification of
their meaning in relation to the domain's conceptualization. And as domain
knowledge is mainly conveyed through scientific and technical texts, we can
hope to extract some useful information from them for building ontology. But is
it as simple as this? In this article we shall see that the lexical structure,
i.e. the network of words linked by linguistic relationships, does not
necessarily match the domain conceptualization. We have to bear in mind that
writing documents is the concern of textual linguistics, of which one of the
principles is the incompleteness of text, whereas building ontology - viewed as
task-independent knowledge - is concerned with conceptualization based on
formal and not natural languages. Nevertheless, the famous Sapir and Whorf
hypothesis, concerning the interdependence of thought and language, is also
applicable to formal languages. This means that the way an ontology is built
and a concept is defined depends directly on the formal language which is used;
and the results will not be the same. The introduction of the notion of
ontoterminology allows to take into account epistemological principles for
formal ontology building.Comment: 22 page
Isabelle/DOF. User and Implementation Manual
The software for which this is the manual is available via the DOI in this recordIsabelle/DOF provides an implementation of DOF on top of Isabelle/HOL. DOF itself is a
novel framework for defining ontologies and enforcing them during document development
and document evolution. Isabelle/DOF targets use-cases such as mathematical texts referring to a theory development or technical reports requiring a particular structure. A major
application of DOF is the integrated development of formal certification documents (e.g.,
for Common Criteria or CENELEC 50128) that require consistency across both formal and
informal arguments.
Isabelle/DOF is integrated into Isabelleâs IDE, which allows for smooth ontology development as well as immediate ontological feedback during the editing of a document. Its checking
facilities leverage the collaborative development of documents required to be consistent with
an underlying ontological structure.
In this user-manual, we give an in-depth presentation of the design concepts of DOFâs Ontology Definition Language (ODL) and describe comprehensively its major commands. Many
examples show typical best-practice applications of the system. Isabelle/DOF is the first ontology language supporting machine-checked links between the formal and informal parts in
an LCF-style interactive theorem proving environment.IRT System
Ontology design patterns to disambiguate relations between genes and gene products in GENIA
MOTIVATION: Annotated reference corpora play an important role in biomedical information extraction. A semantic annotation of the natural language texts in these reference corpora using formal ontologies is challenging due to the inherent ambiguity of natural language. The provision of formal definitions and axioms for semantic annotations offers the means for ensuring consistency as well as enables the development of verifiable annotation guidelines. Consistent semantic annotations facilitate the automatic discovery of new information through deductive inferences. RESULTS: We provide a formal characterization of the relations used in the recent GENIA corpus annotations. For this purpose, we both select existing axiom systems based on the desired properties of the relations within the domain and develop new axioms for several relations. To apply this ontology of relations to the semantic annotation of text corpora, we implement two ontology design patterns. In addition, we provide a software application to convert annotated GENIA abstracts into OWL ontologies by combining both the ontology of relations and the design patterns. As a result, the GENIA abstracts become available as OWL ontologies and are amenable for automated verification, deductive inferences and other knowledge-based applications. AVAILABILITY: Documentation, implementation and examples are available from http://www-tsujii.is.s.u-tokyo.ac.jp/GENIA/
Intelligent multimedia indexing and retrieval through multi-source information extraction and merging
This paper reports work on automated meta-data\ud
creation for multimedia content. The approach results\ud
in the generation of a conceptual index of\ud
the content which may then be searched via semantic\ud
categories instead of keywords. The novelty\ud
of the work is to exploit multiple sources of\ud
information relating to video content (in this case\ud
the rich range of sources covering important sports\ud
events). News, commentaries and web reports covering\ud
international football games in multiple languages\ud
and multiple modalities is analysed and the\ud
resultant data merged. This merging process leads\ud
to increased accuracy relative to individual sources
Towards a Semantic-based Approach for Modeling Regulatory Documents in Building Industry
Regulations in the Building Industry are becoming increasingly complex and
involve more than one technical area. They cover products, components and
project implementation. They also play an important role to ensure the quality
of a building, and to minimize its environmental impact. In this paper, we are
particularly interested in the modeling of the regulatory constraints derived
from the Technical Guides issued by CSTB and used to validate Technical
Assessments. We first describe our approach for modeling regulatory constraints
in the SBVR language, and formalizing them in the SPARQL language. Second, we
describe how we model the processes of compliance checking described in the
CSTB Technical Guides. Third, we show how we implement these processes to
assist industrials in drafting Technical Documents in order to acquire a
Technical Assessment; a compliance report is automatically generated to explain
the compliance or noncompliance of this Technical Documents
- âŠ