Schema-independent mediators using content semantics to access data resources

The paper reports on an experienced and evaluated three layer architectural solution for co-operative database access in real use environment. It looks for mediator software independence from idiosyncrasies of user application interfaces and specific database schemata. The cornerstone to implement this architecture is a set of relational databases and views manipulated by a Relational Inference Machine-RIM. Conceptually It is supported by a semantic model implemented as a modelling technique we have named Content Semantics-CS-which supports pragmatic concept ontology to be expressed as contextualized terms in well-defined semantic domains. Several public databases are daily accessed by mediation services working over millions of data records stored in large databases.