Relational Databases in RDF: Keys and Foreign Keys
Georg Lausen · 2015
Abstract. Today, most of the data on the web resides in relational databases. To make the data available for the semantic web mappings into RDF can be used. Such mappings should preserve the information about the structure of keys and foreign keys, because otherwise impor-tant semantic information is lost. In this paper, we discuss several pos-sible ways to map relational databases into an RDF graph. We discuss the problem of how to represent the original key and foreign key con-straints in the resulting RDF graph and demonstrate, that different kinds of mappings require different solutions. We finally propose to explicitly represent the structure of keys and foreign keys by means of the vocab-ulary of a new RDF namespace. 1