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cs.DB2018
Efficient Handling of SPARQL OPTIONAL for OBDA (Extended Version)
Guohui Xiao, Roman Kontchakov, Benjamin Cogrel +2
OPTIONAL is a key feature in SPARQL for dealing with missing information. While this operator is used extensively, it is also known for its complexity, which can make efficient eva…
cs.AI2018
Inseparability and Conservative Extensions of Description Logic Ontologies: A Survey
Elena Botoeva, Boris Konev, Carsten Lutz +3
The question whether an ontology can safely be replaced by another, possibly simpler, one is fundamental for many ontology engineering and maintenance tasks. It underpins, for exam…