Results 11 to 20 of about 23,746 (255)
Efficient SPARQL Autocompletion via SPARQL [PDF]
arXiv, 2021 We show how to achieve fast autocompletion for SPARQL queries on very large knowledge bases. At any position in the body of a SPARQL query, the autocompletion suggests matching subjects, predicates, or objects. The suggestions are context-sensitive in the sense that they lead to a non-empty result and are ranked by their relevance to the part of the ...
Bast, Hannah +4 more
arxiv +3 more sources
Semantics and Complexity of SPARQL [PDF]
arXiv, 2006 SPARQL is the W3C candidate recommendation query language for RDF. In this paper we address systematically the formal study of SPARQL, concentrating in its graph pattern facility. We consider for this study a fragment without literals and a simple version of filters which encompasses all the main issues yet is simple to formalize.
Perez, Jorge +2 more
arxiv +12 more sources
SPARQL Playground: A block programming tool to experiment with SPARQL [PDF]
, 2015 SPARQL is a powerful query language for SemanticWeb data sources but one which is quite complex to master. As the block programming paradigm has been succesfully used to teach programming skills, we propose a tool that allows users to build and run ...
BOTTONI, Paolo Gaspare +1 more
core +3 more sources
arXiv, 2016 This paper presents a thorough study of negation in SPARQL. The types of negation supported in SPARQL are identified and their main features discussed. Then, we study the expressive power of the corresponding negation operators. At this point, we identify a core SPARQL algebra which could be used instead of the W3C SPARQL algebra.
Angles, Renzo, Gutierrez, Claudio
arxiv +3 more sources
Flexible Querying for SPARQL [PDF]
, 2014 Flexible querying techniques can be used to enhance users' access to heterogeneous data sets, such as Linked Open Data. This paper extends SPARQL 1.1 with approximation and relaxation operators that can be applied to regular expressions for querying property paths in order to find more answers than would be returned by the exact form of a user query ...
Andrea Calı̀ +3 more
openalex +3 more sources
Proceedings of the 18th international conference on World wide web, 2009 C-SPARQL is an extension of SPARQL to support continuous queries, registered and continuously executed over RDF data streams, considering windows of such streams. Supporting streams in RDF format guarantees interoperability and opens up important applications, in which reasoners can deal with knowledge that evolves over time.
BARBIERI, DAVIDE FRANCESCO +4 more
openaire +4 more sources
Theseus: A framework for managing knowledge graphs about geographical divisions and their evolution
Transactions in GIS, Volume 26, Issue 8, Page 3202-3224, December 2022., 2022 Abstract This article presents the Theseus Framework designed for the automatic creation of knowledge graphs (KGs) that describe the evolution of geographical divisions (GD) over time. This framework is based on an ontological model dedicated to the representation of evolving GD (e.g., divisions into regions, districts, municipalities).
Camille Bernard +2 more
wiley +1 more source
SPARQL beyond Subgraph Matching [PDF]
, 2010 We extend the Semantic Web query language SPARQL by defining the semantics of SPARQL queries under the entailment regimes of RDF, RDFS, and OWL. The proposed extensions are part of the SPARQL 1.1 Entailment Regimes working draft which is currently being developed as part of the W3C standardization process of SPARQL 1.1.
Birte Glimm, Markus Krötzsch
openalex +5 more sources
VP-RDF: An RDF Based Framework to Introduce the Viewpoint in the Description of Resources
Applied Computer Systems, 2021 The description of resources and their relationships is an essential task on the web. Generally, the web users do not share the same interests and viewpoints.
Djama Ouahiba
doaj +1 more source
Semantic Web Recommender System over Different Operating Platforms
UHD Journal of Science and Technology, 2022 Semantic-Web Recommender System (SWRS) evaluation over different operating systems (OSs) used to facilitate and improve human electronic recommendation management (HERM).
Halo Khalil Sharif +1 more
doaj +1 more source