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Morph-RDB (formerly called ODEMapster) is an RDB2RDF engine developed by the Ontology Engineering Group, that follows the R2RML specification (

Morph-RDB supports two operational modes: data upgrade (generating RDF instances from data in a relational database) and query translation (SPARQL to SQL). Morph-RDB employs various optimisation techniques in order to generate efficient SQL queries, such as self-join elimination and subquery elimination.

Morph-RDB has been tested with real queries from various Spanish/EU projects and has proven to work faster than other state-of-the-art tools available. At the moment, Morph-RDB works with MySQL, PostgreSQL, H2, CSV files and MonetDB.

How to use

User guides: For those who want to use this project on an user level, you can find a little guide to on the main branch wiki :

If, on the other hand, you want to edit the project or at least work from an IDE such as Eclipse, we suggest you to follow this steps:

  • Download the source code.
  • Once unziped, you may notice that the imports doesn´t match the actual directories. In order to avoid changing all the imports or all the directories, import this way: Import -> Maven -> Existing Maven Project, and select as root the folder where you unziped the project (it may take a few minutes).
  • Now that it´s finally imported, you can run the file (in other to pass the arguments in Eclipse, right click, Run As -> Run Configuration -> Arguments, and remember to imput both the path to the .properties file and it´s full name).
  • In case the program doesn´t find the file, move it from "morph-examples" to "morph-r2rml-rdb", thought this file isn´t essential.


From January 2016 to January 2018, the development of morph-RDB has been supported by the Mobile Age project ( After that period, the development has been supported by the Datos 4.0 Spanish national proect.


  • Freddy Priyatna