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Identifier

000386870

Title

Design and implementation of a semi-automatic tool for mapping source schemas to target ontologies

Alternative Title

Σχεδιασμός και υλοποίηση ενός ημι-αυτόματου συστήματος αντιστοίχισης πηγαίων σχημάτων (source schemas) σε οντολογίες στόχου (target ontologies.

Author

Σμυρνάκη, Ουρανία

Thesis advisor

Πλεξουσάκης, Δημήτριος

Reviewer

Ντέρρ, Μάρτιν
Τζίτζικας, Ιωάννης

Abstract

As the Web evolves from the traditional Web (Web of documents) to the Web of Data (Semantic Web), there is a need for transforming data stored in XML schemas into semantically aware data. In addition, multiple metadata standards exist which vary in semantics and structure even if they belong to the same application domain. Since XML does not express semantics but rather the document structure, there is a lack of semantic interoperability between metadata standards. So, there is a need for expressing semantics, something not feasible with XML. Ontological approaches have been proposed in order to overcome the semantic heterogeneity and achieve metadata interoperability between heterogeneous sources. Ontologies have been created for the expression of semantics such as CIDOC-CRM , an ontology widely used in the cultural heritage domain as a common conceptual schema for information integration. In this thesis, a semi-automatic mapping tool for mapping source schemas to target ontologies is proposed. A mapping description language is used in order to describe the mappings between the source schema and the target ontology. This mapping tool simplifies the mapping process by suggesting target paths of the specified target ontology to the user and by re-using the “mapping-memories” stored in the mapping memory repository. In order to suggest mappings, the system performs schema matching between mapped and not mapped XML files in order to find crosswalks between those files. A mapped XML file is a file the elements of which have been already mapped to the elements in the target ontology and for which a mapping file exists in the mapping memory. Crosswalks found by the schema matching process are used by the mapping suggester, an essential component in the system that suggests mappings to the user. The proposed system also supports a friendly graphical user interface with additional components that analyze the source and the target schema and is designed in order to be used by users without any programming knowledge.

Language

English

Subject

CIDOC-CRM

Mapping tool

Metadata standards

RDF

Schema mapping

Schema matching

Semantic web

XML

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