On the Complexity of Semantic Integration of OWL Ontologies
  We propose a new mechanism for integration of OWL ontologies using semantic
import relations. In contrast to the standard OWL importing, we do not require
all axioms of the imported ontologies to be taken into account for reasoning
tasks, but only their logical implications over a chosen signature. This
property comes natural in many ontology integration scenarios, especially when
the number of ontologies is large. In this paper, we study the complexity of
reasoning over ontologies with semantic import relations and establish a range
of tight complexity bounds for various fragments of OWL.
