The object data standard: ODMG 3.0
The object data standard: ODMG 3.0
Optimizing object queries using an effective calculus
ACM Transactions on Database Systems (TODS)
Relational.OWL: a data and schema representation format based on OWL
APCCM '05 Proceedings of the 2nd Asia-Pacific conference on Conceptual modelling - Volume 43
ActiveRDF: object-oriented semantic web programming
Proceedings of the 16th international conference on World Wide Web
Rewriting Queries by Means of Model Transformations from SPARQL to OQL and Vice-Versa
ICMT '09 Proceedings of the 2nd International Conference on Theory and Practice of Model Transformations
Bridging query languages in semantic and graph technologies
ReasoningWeb'10 Proceedings of the 6th international conference on Semantic technologies for software engineering
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The Web of Data vision raises the problem of how to expose existing data sources on the Web without requiring heavy manual work. In this paper, we present our approach to facilitate SPARQL queries over heterogeneous data sources. We propose the use of an object-oriented abstraction which can be automatically mapped and translated into an ontological one; this approach, on the one hand, helps data managers to disclose their sources without the need of a deep understanding of Semantic Web technologies and standards and, on the other hand, takes advantage of object-relational mapping (ORM) technologies and tools to deal with different types of data sources (relational DBs, but also XML sources, object-oriented DBs, LDAP, etc.). We introduce both the theoretical foundations of our solution, with the analysis of the relation and mapping between SPARQL algebra and monoid comprehension calculus (the formalism behind object queries), and the implementation we are using to prove the feasibility and the benefits of our approach and to compare it with alternative methods.