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Identifier

000382634

Title

A query formulation tool for semantic networks

Alternative Title

Σχεδίαση και ανάπτυξη ενός γραφικού συντάκτη επερωτήσεων για σημασιολογικά δίκτυα

Author

Ασαρίδης, Χρήστος

Thesis advisor

Τζίτζικας, Ιωάννης

Reviewer

Doerr, Martin
Πλεξουσάκης, Δημήτρης

Abstract

Over the last few years, there has been a trend of developing greater and greater metadata repositories, mostly based on RDF/S technology. A good example is the Europeana project in the field of cultural heritage. The international standard ISO (CIDOC Conceptual Reference Model) is a rich RDF schema able to integrate complex cultural data. Far more simplistic models (such as Dublin Core), which consist exclusively of core metadata (few classes-flat relationships), have only a limited potential to integrate knowledge and to apply reasoning to the schema. On the other hand, searching complex structures using query languages like SPARQL is a difficult and painful procedure because of the large amount of classes and properties in ontologies, such as the CIDOC-CRM. In order to simplify the search process, we introduced a simpler model consisting of only a few fundamental classes and relationships. Fundamental relationships can be defined by using a “paths language” (over the CIDOC-CRM schema), which is designed for non-expert users. In order to take advantage of this paths’ language, we have designed and implemented a graphical editor, which assists users in writing triple patterns and verifying their syntax. The graphical editor enables users to overview the declared paths and allows them to check the validity and the completeness of a query against the intended functionality. In addition, the editor allows users to easily modify, relax and restrict a query. The given functionalities help users to avoid errors, such as the misspelling of the name of classes (or properties), the omission of the use of predefined special characters for paths connection and the use of different kinds of brackets according to the context. For the evaluation of the graphical editor, we asked non-expert users to test it and give us feedback of their usage experience. Users tested it in the CIDOC-CRM and the CIDOC-CRMdig, and the results of these tests were positive.

Language

English

Subject

Graphical editor

Metadata

Semantic search

Visual query system

Ανάκτηση πληροφορίας

Γραφικό σύστημα επερωτήσεων

Μεταδεδομένα

Σημασιολογικό δίκτυο

Issue date