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  • Statistics of RDF Store for Querying Knowledge Graphs
    Savnik, Iztok ...
    Many RDF stores treat graphs as simple sets of vertices and edges without a conceptual schema. The statistics in the schema-less RDF stores are based on the cardinality of the keys representing the ... constants in triple patterns. In this paper, we explore the effects of storing knowledge graphs in an RDF store on the structure of the space of queries and, consequently, on the definition of the framework for the computation of the statistics. We propose a formal framework for an RDF store with a complete conceptual schema. The poset of schema triples defines the structure of the types of triple patterns and, therefore, the structure of the query space. The set of schema triples, together with the ontology of classes and predicates, form the conceptual schema of a knowledge graph, referred to as a schema graph. We present an algorithm for computing the statistics of a schema graph that consists of the schema triples from the stored schema graph and the schema triples that are more general/specific than the stored schema triples up to a user-defined level.
    Vir: Foundations of information and knowledge systems [Elektronski vir] : 12th International Symposium, FoIKS 2022 Helsinki, Finland, June 20–23, 2022 : proceedings (Str. 93-110)
    Vrsta gradiva - prispevek na konferenci
    Leto - 2022
    Jezik - angleški
    COBISS.SI-ID - 116220931
    DOI

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