A semi-automatic approach for generating customized R2RML mappings

Abstract

The Linked Data initiative brought new opportunities for building the next generation of Web applications. However, the full potential of linked data depends on how easy it is to transform data stored in relational databases into RDF triples. Recently, the W3C RDB2RDF Working Group proposed a mapping language, called R2RML, to specify mappings between relational schemas and RDF vocabularies. However, the specification of R2RML mappings is not an easy task. This paper therefore proposes a strategy to simplify the specification of R2RML mappings. The paper first introduces correspondence assertions, which provide a convenient way to manually model mappings between relational schemas and RDF vocabularies. Then, the paper describes a method to automatically generate R2RML mappings from the correspondence assertions.

Design Rationale in the Triplification of Relational Databases

“…The RBA method proposes to generate customized R2RML mappings based on correspondence assertions (Vidal et al, 2014 ;Neto et al, 2013). The inputs of the method are a relational database schema that will be published as RDF and a set of domain ontologies.…”

“…The first step of RBA is manual and relies on the user to define mappings between the relational database and the domain ontologies using correspondence assertions (CAs), which are much simpler to understand than R2RML and yet suffice to capture most of the subtleties of mapping relational schemas into RDF schema (Vidal et al, 2014). A tool has also been developed to the designer in this step (Vidal et al, 2014 ;Vidal et al, 2005).…”

“…A tool has also been developed to the designer in this step (Vidal et al, 2014 ;Vidal et al, 2005). and σ is an optional selection over R.…”

“…4, 5, 7, 8, 10, 12,13, 15 and 17 at The algorithm receives as input the enriched exported ontology and a set of templates for creating SQL views and R2RML mappings. The complete list of these templates can be found in (Vidal et al, 2014).…”

“…By contrast, R 2 BA is the first method to capture design rationale for a customized mapping process as far as we know. It should be stressed that this method has not been described in (Vidal et al, 2014 ;Pequeno et al, 2014).…”