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01/27/2021
Characterising Fixed Parameter Tractability of Query Evaluation over Guarded TGDs
We study the parameterized complexity of evaluating Ontology Mediated Qu...
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01/08/2021
Answer Counting under Guarded TGDs
We study the complexity of answer counting for ontology-mediated queries...
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10/22/2020
From Conjunctive Queries to Instance Queries in Ontology-Mediated Querying
We consider ontology-mediated queries (OMQs) based on expressive descrip...
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03/17/2020
When is Ontology-Mediated Querying Efficient?
In ontology-mediated querying, description logic (DL) ontologies are use...
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12/28/2019
The Limits of Efficiency for Open- and Closed-World Query Evaluation Under Guarded TGDs
Ontology-mediated querying and querying in the presence of constraints a...
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04/19/2018