Ultrawrap Mapper: A Semi-Automatic Relational Database to RDF (RDB2RDF) Mapping Tool

In this demo, we will show the operation of Ultrawrap Mapper, a semi-automatic software for creating mappings from Relational Databases to RDF in the R2RML language. In 2012, the W3C ratified two related standards for mapping relational database contents to RDF: the Direct Mapping [1] and R2RML [2]. The Direct Mapping is a default mapping of relational data to RDF. The organization and content of the resulting RDF triples is based on the schema and content of the database. Programs that implement the Direct Mapping do not need user input. R2RML is a language where users can express the mapping of relational data elements to RDF. A user must detail the mapping of relational data and metadata, (table and column names) to each field of a triple. Components of the language include, TripleMap, SubjectMap and PredicateObjectMap, etc. Depending on the size of the database, the R2RML mapping files can be very large. Recent R2RML editors have been developed which provide users a GUI to create the mappings [3,4,5]. These tools are a first step to eliminating the burden of learning the R2RML syntax. However, we observe that these tools are still R2RML and RDF driven: the user needs to understand how R2RML conceptually works.