The 12th International Semantic Web Conference
and the 1st Australasian Semantic Web Conference
21-25 October 2013, Sydney, Australia

Relational Database to RDF

Relational Database to RDF (RDB2RDF) Tutorial: The new R2RML and Direct Mapping Standards, from Semantics to Practice

Tutorial webpage


  • Juan F. Sequeda (Department of Computer Science, The University of Texas at Austin)
  • Barry Norton
  • Daniel Miranker (Department of Computer Science, The University of Texas at Austin)


In one study it was reported that there is 500 times as much data in the hidden or deep web, then there is in crawlable, indexable web pages. Most of this data is stored in relational databases. Hence, the Semantic Web’s promise of Web-scale data integration will only live up to its true promise with the inclusion of legacy relational database management systems (RDBMS). Two new, interrelated and complementary W3C standards, “Direct Mapping of Relational Data to RDF” and “R2RML: RDB to RDF Mapping Language”, are poised to enable this data into the web of Linked Data. This tutorial will introduce, contrast and explain the preferred solution organizations embodies by these two standards. The tutorial will also include a hands-on session.