Jesús Barrasa

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We present R2O, an extensible and declarative language to describe mappings between relational DB schemas and ontologies implemented in RDF(S) or OWL. R2O provides an extensible set of primitives with welldefined semantics. This language has been conceived expressive enough to cope with complex mapping cases arisen from situations of low similarity between(More)
The mapping between databases and ontologies is a basic problem when trying to "upgrade" deep web content to the semantic web. Our approach suggests the declarative definition of mappings as a way to achieve domain independency and reusability. A specific language (expressive enough to cover some real world mapping situations like lightly structured(More)
In this document we provide an overall view of the state of the art in ontology alignment. It is organised as a description of the need for ontology alignment, a presentation of the techniques currently in use for ontology alignment and a presentation of existing systems. The state of the art is not restricted to any discipline and consider as some form of(More)
In this document we provide an overall view of the state of the art in ontology alignment. It is organised as a description of the need for ontology alignment, a presentation of the techniques currently in use for ontology alignment and a presentation of existing systems. The state of the art is not restricted to any discipline and consider as some form of(More)
Although navigation through the World Wide Web (WWW) may seem pretty straightforward to most of us, a large group of individuals exists for whom it is not quite as easy. We are referring to people with disabilities. This paper is a proposal for an Internet user agent (browser) designed to help people with severe physical impairments to navigate the(More)
In this paper we describe how UML schemes can be converted into OWL Ontology, thus enabling reasoning on them by Semantic Web applications. The proposed solution is based on a three phases approach, the first step is to present the class diagram in the mathematical formulation and the second one is converting the UML Class into encoded text file, finally,(More)
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