RDF Data Descriptions.
Georg Lausen, Michael F. Schmidt · 2014
Abstract. Linked Open Data (LOD) sources on the Web are increas-ingly becoming more popular. RDF constraints can be used to charac-terize the RDF graphs being provided by such sources. For applications that process data retrieved from several of such RDF graphs it becomes interesting to analyze the relationships of the different sets of constraints associated with the sources providing the RDF graphs. In this short pa-per we discuss how the constraints from different sources can be aggre-gated to a set of constraints characterizing the union of the RDF graphs under consideration. For expressing constraints we use Datalog+/-. The recent RDF Validation Workshop [9] states a gap between the cur-rent standards offering and the industry needs for validation of RDF data. As a possible solution, in continuation of our previous work [7], we have developed a constraint language RDD (RDF Data Descriptions) [8], that captures a broad range of constraints including keys, cardinalities, sub-class, and subproperty restrictions, making it easy to implement RDD