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The Bag Semantics of Ontology-Based Data Access
[article]
2017
arXiv
pre-print
Ontology-based data access (OBDA) is a popular approach for integrating and querying multiple data sources by means of a shared ontology. The ontology is linked to the sources using mappings, which assign views over the data to ontology predicates. Motivated by the need for OBDA systems supporting database-style aggregate queries, we propose a bag semantics for OBDA, where duplicate tuples in the views defined by the mappings are retained, as is the case in standard databases. We show that bag
arXiv:1705.07105v1
fatcat:gcnfenumdrf5jn5x53ddqbciz4