Results 201 to 210 of about 32,178 (242)
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ACM Journal on Computing and Cultural Heritage
In this article, we focus on the task of exploiting the capabilities of Large Language Models (LLMs) to generate SPARQL Queries for answering natural questions over cultural Knowledge Graphs (KGs) expressed according to the ISO standard ontology CIDOC ...
M. Mountantonakis, Yannis Tzitzikas
semanticscholar +1 more source
In this article, we focus on the task of exploiting the capabilities of Large Language Models (LLMs) to generate SPARQL Queries for answering natural questions over cultural Knowledge Graphs (KGs) expressed according to the ISO standard ontology CIDOC ...
M. Mountantonakis, Yannis Tzitzikas
semanticscholar +1 more source
Ontology-Mediated SPARQL Query Answering over Knowledge Graphs
Big Data Research, 2021Ontology-Mediated Query Answering (OMQA) is a well-established framework to answer queries over Knowledge Graphs (KGs), enriched with rdfs or owl ontologies.
Guohui Xiao, Julien Corman
semanticscholar +1 more source
f-SPARQL: A Flexible Extension of SPARQL
2010We propose an flexible extension of SPARQL by introducing fuzzy set theory and the α-cut operation of fuzzy numbers into SPARQL. We show how to efficiently compute the top-k answers of flexible SPARQL queries with regard to membership degrees and user-defined weights.
Jingwei Cheng, Z. M. Ma, Li Yan
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SPARQL-MM - Extending SPARQL to Media Fragments
2014Interconnecting machine readable data with multimedia assets and fragments has recently become a common practice. But specific retrieval techniques for the so called Semantic Multimedia data are still lacking. On our poster we present SPARQL-MM, a function set that extends SPARQL to Media Fragment facilities by introducing spatio-temporal filter and ...
Thomas Kurz +4 more
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International Journal on Semantic Web and Information Systems, 2009
The SPARQL Query Language for RDF and the SPARQL Protocol for RDF are implemented by a growing number of storage systems and are used within enterprise and open Web settings. As SPARQL is taken up by the community, there is a growing need for benchmarks to compare the performance of storage systems that expose SPARQL endpoints via the SPARQL protocol ...
Bizer, Christian, Schultz, Andreas
openaire +1 more source
The SPARQL Query Language for RDF and the SPARQL Protocol for RDF are implemented by a growing number of storage systems and are used within enterprise and open Web settings. As SPARQL is taken up by the community, there is a growing need for benchmarks to compare the performance of storage systems that expose SPARQL endpoints via the SPARQL protocol ...
Bizer, Christian, Schultz, Andreas
openaire +1 more source
Reverse Engineering SPARQL Queries
Proceedings of the 25th International Conference on World Wide Web, 2016Semantic Web systems provide open interfaces for end-users to access data via a powerful high-level query language, SPARQL. But users unfamiliar with either the details of SPARQL or properties of the target dataset may find it easier to query by example -- give examples of the information they want (or examples of both what they want and what they do ...
Arenas, M, Diaz, G, Kostylev, E
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Computing Recursive SPARQL Queries
2014 IEEE International Conference on Semantic Computing, 2014We present a simple approach to handle recursive SPARQL queries, that is, nested queries that may contain references to the query itself. This powerful feature is obtained by implementing a custom SPARQL function that takes a SPARQL query as a parameter and executes it over a specified endpoint. The behaviour is similar to the SPARQL 1.1 SERVICE clause,
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SPARQL-ST: Extending SPARQL to Support Spatiotemporal Queries
2011Spatial and temporal data is plentiful on the Web, and Semantic Web technologies have the potential to make this data more accessible and more useful. Semantic Web researchers have consequently made progress towards better handling of spatial and temporal data.SPARQL, the W3C-recommended query language for RDF, does not adequately support complex ...
Perry, Matthew +2 more
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SPARQL-DL: SPARQL query for OWL-DL
2007There are many query languages (QLs) that can be used to query RDF and OWL ontologies but neither type is satisfactory for querying OWL-DL ontologies. RDF-based QLs (RDQL, SeRQL, SPARQL) are harder to give a semantics w.r.t. OWL-DL and are more powerful than what OWL-DL reasoners can provide.
Sirin, Evren, Parsia, Bijan
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A survey of RDF stores & SPARQL engines for querying knowledge graphs
VLDB Journal, 2021Waqas Ali, Aidan Hogan
exaly