RDB2Onto: Approach for creating semantic metadata from relational database data Martin Šeleng, Michal Laclavík, Zoltán Balogh, Ladislav Hluchý Institute.

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Presentation transcript:

RDB2Onto: Approach for creating semantic metadata from relational database data Martin Šeleng, Michal Laclavík, Zoltán Balogh, Ladislav Hluchý Institute of Informatics, Slovak Academy of Sciences, Dúbravská cesta 9, Bratislava, Slovakia www: 9 th International Conference June 21-22, 2007 Bratislava, Slovakia This work is supported by projects NAZOU SPVV 1025/2004, RAPORT APVT , SEMCO-WS APVV , VEGA 2/7098/27.

Problem  Building ontology based information systems, it is frequently necessary to convert or replicate data from existing information systems such as databases to the ontology based information systems  Usually data in existing information systems are stored in a relational databases

Approaches  Modeling languages D2R MAP R2O (not implemented yet)  Tools D2RQ (using D2R MAP language) RDQUERY (using SPARQL or RDQL queries) RDB2Onto (using RDF/OWL XML templates and SQL queries)

Advantages and Disadvantages of the tools approaches  Disadvantages RDQuery - uses RDQL and its successor SPARQL language which most users are not familiar D2RQ - uses own mapping language which users must learn but it is more intuitive than RDQL or SPARQL language (also automatic creation is possible by generate-mapping tool) RDB2Onto – uses template RDF/OWL XML files which structure users must learn  Advantages Better than hand made copying

RDB2Onto Architecture

Example of RDB2Onto usage: sql query and template RDF/OWL XML file <rdf:RDF xmlns:jo=" xmlns:inst=" xmlns:c=" xmlns:ofr=" xmlns:rdf=" xmlns:owl=" xmlns:rdfs=" {download_date} {url} {original_doc_path} {converted_doc_path} SELECT id, url, original_doc_path, converted_doc_path, download_date, IF(lang = 'sk', 'Slovak', 'English') AS lang FROM document

Evaluation on 500 job offers RDQuery Execution Time [s] SPARQL Query Query Translation Mapping Process 1 Query D2RQ Execution Time [s] SQL Query Query Translation Mapping Process 1 Query RDB2Onto Execution Time [s] SQL Query Query Translation Mapping Process 1 Query

Thank You For Your Attention Questions?