Answers of SPARQL 1.1 queries along with their temporal validity intervals over temporal RDF datasets
by Anastasia Analyti
International Journal of Web Engineering and Technology (IJWET), Vol. 18, No. 4, 2023

Abstract: In this paper, we deal with temporal RDF datasets and temporal validity SPARQL queries (tv-SPARQL queries, for short) over these datasets. Temporal RDF datasets are defined as regular RDF datasets but now RDF triples are accompanied with a list of temporal validity intervals. The tv-SPARQL language is a slight extension of the SPARQL 1.1 language and queries imposed in this language on temporal RDF datasets result in mappings on the variables in the SELECT clause, along with a list of temporal validity intervals. The semantics of the tv-SPARQL language is defined based on the semantics of the SPARQL 1.1 language. It is the case that if a SPARQL 1.1 query q is applied on a snapshot of a temporal RDF dataset DS^t at time point t and a mapping μ is derived in the answer then μ along with a list of temporal validity intervals TIL that includes time point t will be derived in the answer of applying q on DS^t. The inverse also holds. A list of algorithms are presented for providing the answers of a tv-SPARQL q on a dataset DS^t. Correctness of the algorithms based on the defined semantics is also provided.

Online publication date: Fri, 19-Jan-2024

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