Modular Path Queries with Arithmetic

02/11/2020

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by   Jakub Michaliszyn, et al.

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We propose a new approach to querying graph databases. Our approach balances competing goals of expressive power, language clarity and computational complexity. A distinctive feature of our approach is the ability to express properties of minimal (e.g. shortest) and maximal (e.g. most valuable) paths satisfying given criteria. To express complex properties in a modular way, we introduce labelling-generating ontologies. The resulting formalism is computationally attractive – queries can be answered in non-deterministic logarithmic space in the size of the database.