If the current Web is to evolve into a Semantic Web, eventually RDB information has to be transported into semantically aware data structures. To this end, many ontology schemata have been created and many more are to be defined, a process which requires intense experimentation with real data. These requirements have led to the creation of systems for instantiating ontology schemata using relational database information, with some, like D2RQ and Virtuoso,gaining wider acceptance in the Semantic Web community.Unfortunately, all these tools either require advanced user skills as they are built upon complex declarative languages and lack friendly user interfaces (thus requiring a hard learning curve), or in case they support friendly interfaces, they provide limited expressivity, and/or come with a commercial licence.