By Serge Linckels, Christoph Meinel
This ebook introduces a brand new method of designing E-Librarian providers. With the aid of the program, clients may be capable of retrieve multimedia assets from electronic libraries extra successfully than they'd by means of looking via an index or through the use of an easy key-phrase seek. E-Librarian providers mix contemporary advances in multimedia info retrieval with elements of human-machine interfaces, comparable to the power to invite questions in typical language; they simulate a human librarian through discovering and supplying the main suitable records that supply clients power solutions to their queries. the idea is that extra pertinent effects could be retrieved if the quest engine knows the that means of the question; the lower back effects are accordingly logical effects of an inference instead of of key-phrase suits. furthermore, E-Librarian prone continuously supply clients with an answer, even in occasions the place they're not able to supply a complete answer.
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Extra resources for E-Librarian Service: User-Friendly Semantic Search in Digital Libraries
Linckels . 3 From OWL 1 to OWL 2 OWL has been a W3C recommendation since 2004. OWL 2, the successor of OWL 1, has been a W3C recommendation since 2009. OWL 2 has a very similar overall structure to OWL 1 and is completely backward compatible. Almost all the building blocks of OWL 2 were present in OWL 1. Also, the central role of RDF has not changed. , role chains, richer datatypes, qualiﬁed cardinality restrictions, and asymmetric, reﬂexive and disjoint properties. , EL, QL, and RL. ” This could not be expressed in OWL 1.
1. Semantic Web architecture, the so called Layer Cake. 2 Ontologies Ontologies are seen as a key component of the Semantic Web. They are used as a form of knowledge representation about the world or some part of it. The term ontology has its origin in philosophy, where it is the name of one fundamental branch of metaphysics concerned with analyzing various types or modes of existence. In both computer science and information science, an ontology is a data model that represents a set of concepts within a domain and the relationships between those concepts.
Ontologies “value restriction” provide value restrictions to specify what can ﬁll a property. • More complex expressions over classes and properties require operations like disjointness, inverse and part-of. • Very expressive ontology languages allow to specify ﬁrst order logic constraints between terms. According to the needed expressivity of the ontology, an appropriated language to formalize its speciﬁcations and conceptualizations must be used. XML, RDF and OWL are the most common in the Semantic Web.