RML: A Generic Language for Integrated RDF Mappings of Heterogeneous Data

Despite the significant number of existing tools, incorporat-ing data from multiple sources and different formats into the Linked Open Data cloud remains complicated. No mapping formalisation exists to define how to map such heterogeneous sources into rdf in an integrated and interoperable fashion. This paper introduces the rml mapping language, a generic language based on an extension over rrml, the wc stan-dard for mapping relational databases into rdf. Broadening rrml’s scope, the language becomes source-agnostic and extensible, while facilitating the definition of mappings of multiple heterogeneous sources. This leads to higher integrity within datasets and richer interlinking among resources. 1