Results 131 to 140 of about 23,746 (255)
Constrained regular expressions in SPARQL [PDF]
, 2007 International ...
Alkhateeb, Faisal +2 more
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Interoperable chemical structure search service
Journal of Cheminformatics, 2019 Motivation The existing connections between large databases of chemicals, proteins, metabolites and assays offer valuable resources for research in fields ranging from drug design to metabolomics.
Miroslav Kratochvíl +2 more
doaj +1 more source
Certain Answers to a SPARQL Query over a Knowledge Base (extended version) [PDF]
arXiv, 2019 Ontology-Mediated Query Answering (OMQA) is a well-established framework to answer queries over an RDFS or OWL Knowledge Base (KB). OMQA was originally designed for unions of conjunctive queries (UCQs), and based on certain answers. More recently, OMQA has been extended to SPARQL queries, but to our knowledge, none of the efforts made in this direction
arxiv
Querying clinical data in HL7 RIM based relational model with morph-RDB
Journal of Biomedical Semantics, 2017 Background Semantic interoperability is essential when carrying out post-genomic clinical trials where several institutions collaborate, since researchers and developers need to have an integrated view and access to heterogeneous data sources.
Freddy Priyatna +3 more
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Towards Learning Commonalities in SPARQL
, 2017 Finding the commonalities between descriptions of data or knowledge is a foundational reasoning problem of Machine Learning, which amounts to computing a least general generalization (lgg) of such descriptions. We revisit this old problem in the popular conjunctive fragment of SPARQL, a.k.a. Basic Graph Pattern Queries (BGPQs). In particular, we define
El Hassad, Sara +2 more
openaire +5 more sources
SPARQL Extensions for processing alignments
IEEE Intelligent Systems, 2008 International ...
Euzenat, Jérôme +2 more
openaire +4 more sources
Applied SciencesGenerating SPARQL queries from natural language questions is challenging in Knowledge Base Question Answering (KBQA) systems. The current state-of-the-art models heavily rely on fine-tuning pretrained models such as T5.
Jiexing Qi +7 more
doaj +1 more source
On the Statistical Analysis of Practical SPARQL Queries [PDF]
arXiv, 2016 In this paper, we analyze some basic features of SPARQL queries coming from our practical world in a statistical way. These features include three statistic features such as the occurrence frequency of triple patterns, fragments, well-designed patterns and four semantic features such as monotonicity, non-monotonicity, weak monotonicity (old solutions ...
arxiv
On foundational aspects of RDF and SPARQL
, 2019 We consider the recommendations of the World Wide Web Consortium (W3C) about the Resource Description Framework (RDF) and the associated query language SPARQL. We propose a new formal framework based on category theory which provides clear and concise formal definitions of the main basic features of RDF and SPARQL.
Duval, Dominique +2 more
openaire +4 more sources
Dataset of ontology competency questions to SPARQL-OWL queries translations
Data in Brief, 2020 This data article reports on a new set of 234 competency questions for ontology development and their formalisation into a set of 131 SPARQL-OWL queries.
Jedrzej Potoniec +3 more
doaj