A General Sufficient Condition for Rewriting Horn-ALCHI Atomic Queries into GQL
The emergence of the ISO standard GQL introduces a powerful query language extending first-order logic with controlled recursion, raising the question of its applicability to evaluation of ontology-mediated queries (OMQs). We focus on OMQs consisting of atomic queries over ontologies expressed in Horn-ALCHI, an expressive Description Logic that is not, in general, first-order rewritable. To address this, we introduce DL automata, a novel formalism that captures the semantics of such OMQs via runs over fact sets. We then identify a large class of DL automata that can be rewritten into unions of conjunctive two-way regular path queries (UC2RPQs), a central fragment of GQL. Our class of auto...
| Authors | David Carral, Calixte Gruson, Quentin Manière |
|---|---|
| Primary category | cs.DB |
| Published | 5 August 2026 |
| Last updated at source | 5 August 2026 |
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