Abstract
In this paper we study the evolution of ontologybased data access (OBDA) specifications, and focus
on the case in which the ontology and/or the data
source schema change, which may require a modification to the mapping between them to preserve
both consistency and knowledge. Our approach is
based on the idea of repairing the mapping according to the usual principle of minimal change and on
a recent, mapping-based notion of consistency of the
specification. We define and analyze two notions of
mapping repair under ontology and source schema
update. We then present a set of results on the complexity of query answering in the above framework,
when the ontology is expressed in DL-LiteR