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An extension of SPARQL for expressing qualitative preferences [article]

Antonis Troumpoukis, Stasinos Konstantopoulos, Angelos Charalambidis
2017 arXiv   pre-print
In this paper we present SPREFQL, an extension of the SPARQL language that allows appending a PREFER clause that expresses "soft" preferences over the query results obtained by the main body of the query  ...  The extension does not add expressivity and any SPREFQL query can be transformed to an equivalent standard SPARQL query.  ...  For more details, please visit https://www.big-data-europe.eu Bibliography  ... 
arXiv:1707.06406v1 fatcat:tmpolpsl3nbbxjumr5fzkswgzu

An Extension of SPARQL for Expressing Qualitative Preferences [chapter]

Antonis Troumpoukis, Stasinos Konstantopoulos, Angelos Charalambidis
2017 Lecture Notes in Computer Science  
In this paper we present SPREFQL, an extension of the SPARQL language that allows appending a "PREFER" clause that expresses 'soft' preferences over the query results obtained by the main body of the query  ...  The extension does not add expressivity and any SPREFQL query can be transformed to an equivalent standard SPARQL query.  ...  For more details, please visit https://www.big-data-europe.eu Bibliography  ... 
doi:10.1007/978-3-319-68288-4_42 fatcat:6ehclyp7r5f77dmolavj3chhlu

SPARQL extensions with preferences

Olivier Pivert, Olfa Slama, Virginie Thion
2016 Proceedings of the 31st Annual ACM Symposium on Applied Computing - SAC '16  
The last decade has witnessed an increasing interest in expressing preferences inside database queries.  ...  This paper presents a survey of these approaches, classifies them, and points out research perspectives.  ...  This extension of SPARQL is called PrefSPARQL. It supports, not only the expression of qualitative preferences (skyline) but also of conditional ones (if-then-else).  ... 
doi:10.1145/2851613.2851690 dblp:conf/sac/PivertST16 fatcat:7mnd3cdt6bewnlycpep2lcz7nu

Handling qualitative preferences in SPARQL over virtual ontology-based data access

Marlene Goncalves, David Chaves-Fraga, Oscar Corcho, Axel-Cyrille Ngonga Ngomo, Muhammad Saleem, Ruben Verborgh
2022 Semantic Web Journal  
Our main contribution is Morph-Skyline++, a framework for processing SPARQL qualitative preferences by directly querying relational databases.  ...  In this paper, we address the problem of evaluating SPARQL qualitative preference queries over an Ontology-Based Data Access (OBDA) approach, which provides uniform access over multiple and heterogeneous  ...  Acknowledgements This research is financially supported by Ministerio de Ciencia e Innovación, Spain, under grant Knowledge Spaces (PID2020-118274RB-I00) and by an FPI grant (BES-2017-082511).  ... 
doi:10.3233/sw-212895 fatcat:fymhzoy3wnfhxmmirvmgv3vhpm

Querying the Semantic Web with Preferences [chapter]

Wolf Siberski, Jeff Z. Pan, Uwe Thaden
2006 Lecture Notes in Computer Science  
There is no common language element to express and formalize ranking and preferences. We present a comprehensive extension of SPARQL which directly supports the expression of preferences.  ...  This includes formal syntax and semantics of preference expressions for SPARQL. Additionally, we report our implementation of preference query processing, which is based on the ARQ query engine.  ...  In Section 4, we show how to apply these concepts for our extension of SPARQL.  ... 
doi:10.1007/11926078_44 fatcat:mi6i2olc4bdcbfpkaksjeg3pea

An extension of SPARQL with fuzzy navigational capabilities for querying fuzzy RDF data

Olivier Pivert, Olfa Slama, Virginie Thion
2016 2016 IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)  
This paper proposes a fuzzy extension of the SPARQL language that improves its expressiveness and usability.  ...  This extension allows (1) to query a fuzzy RDF data model, and (2) to express fuzzy preferences on data and on the structure of the data graph, which has not been proposed in any previous fuzzy extensions  ...  More recently, [1] proposed an extension of SPARQL which captures more expressive graph patterns, called PSPARQL (Path SPARQL).  ... 
doi:10.1109/fuzz-ieee.2016.7737995 dblp:conf/fuzzIEEE/PivertST16 fatcat:nhzdi4dhufhstpaaw34rrzdoam

Combining RDF and SPARQL with CP-theories to reason about preferences in a Linked Data setting

Vito Walter Anelli, Renato De Leone, Tommaso Di Noia, Thomas Lukasiewicz, Jessica Rosati, Axel Polleres
2018 Semantic Web Journal  
Among them, one of the most prominent formalism to represent and reason with (qualitative) conditional preferences (CPs) are conditional preference theories (CP-theories).  ...  The framework that we propose allows a standard SPARQL client to query Linked Data datasets, and to order the results of such queries relative to a set of user preferences.  ...  Acknowledgments The authors wish to thank Francesco Paolo Albano for his unvaluable help in the implementation of the full framework and for his continuous support in its maintenance and further development  ... 
doi:10.3233/sw-180339 fatcat:myri77dzrfg45g2hgldcobkocq

Preference Queries with Ceteris Paribus Semantics for Linked Data [chapter]

Jessica Rosati, Tommaso Di Noia, Thomas Lukasiewicz, Renato De Leone, Andrea Maurino
2015 Lecture Notes in Computer Science  
Among them, one of the most prominent formalism to represent and reason with (qualitative) conditional preferences (CPs) are conditional preference theories (CP-theories).  ...  The framework that we propose allows a standard SPARQL client to query Linked Data datasets, and to order the results of such queries relative to a set of user preferences.  ...  The PrefSPARQL syntax of [18] needs no additional solution modifier to express qualitative preferences, as it leverages the expressive power of SPARQL 1.1.  ... 
doi:10.1007/978-3-319-26148-5_28 fatcat:sw44lct5abge3hkiuwqhophif4

SPARQL-ST: Extending SPARQL to Support Spatiotemporal Queries [chapter]

Matthew Perry, Prateek Jain, Amit P. Sheth
2011 Geospatial Semantics and the Semantic Web  
In this work, we present the SPARQL-ST query language. SPARQL-ST is an extension of SPARQL for complex spatiotemporal queries. We present a formal syntax and semantics for SPARQL-ST.  ...  In addition, we describe a prototype implementation of SPARQL-ST and demonstrate the scalability of this implementation with a performance study using large real-world and synthetic RDF datasets.  ...  Prasad for his helpful comments on our formalization of SPARQL-ST, and Cory Henson for his comments on a draft of this work.  ... 
doi:10.1007/978-1-4419-9446-2_3 dblp:conf/swb/PerryJS11 fatcat:4mgxyhlzvbhzfj6xois2xoujp4

Knowledge Graph Exploration: A Usability Evaluation of Query Builders for Laypeople [chapter]

Emil Kuric, Javier D. Fernández, Olha Drozd
2019 Lecture Notes in Computer Science  
Key aspects for usability, extracted from the evaluation, serve as important contributions for future query builders.  ...  SPARQL enables users to access and browse knowledge graphs in a precise way. However, using SPARQL requires knowledge that many casual users lack.  ...  This work is supported by the EU's Horizon 2020 research and innovation programme: grant 731601 (SPECIAL), the Austrian Research Promotion Agency's (FFG) program "ICT of the Future": grant 861213 (CitySPIN  ... 
doi:10.1007/978-3-030-33220-4_24 fatcat:aeh4mrmacrgr5bmprg5v6zhkje

Sparklis over PEGASE Knowledge Graph: A New Tool for Pharmacovigilance

Carlos Bobed, Laura Douze, Sébastien Ferré, Romaric Marcilly
2018 Figshare  
Pharmacovigilance is in charge of studying the adverse effects of pharmaceutical products.  ...  has been performed by human factors specialists to check the benefits of our proposal.  ...  A number of problems made it impossible to express in Sparklis, and thus required an extension to handle hierarchies in the building and evaluation of queries.  ... 
doi:10.6084/m9.figshare.7370051 fatcat:cuaufhrnnbeafnf6ebbkrmmw4m

PQMPMS: A Preference-enabled Querying Mechanism for Personalized Mobile Search [chapter]

Beibei Hu, Yves Vanrompay, Marie-Aude Aufaure
2013 Lecture Notes in Computer Science  
An experiment shows that our approach allows to compute the most relevant answers, providing an increased quality of search experience for the user.  ...  To adapt the retrieved items to user's context, this paper presents a preference-enabled querying mechanism for personalized mobile search.  ...  C-SPARQL as an extension of SPARQL allows existing reasoning mechanisms to be further extended in order to support continuous reasoning over data streams and rich background knowledge [2] .  ... 
doi:10.1007/978-3-642-39666-3_21 fatcat:j7igtlzbm5e55eu3bu3vht7ycq

Functions over RDF Language Elements [chapter]

Bernhard Schandl
2009 Lecture Notes in Computer Science  
Second, we define a syntax for expressing RDFunctions, which can be edited, parsed and evaluated. Third, we discuss Tripcel, an implementation of RDFunctions using a spreadsheet metaphor.  ...  Alternatively, query languages like SPARQL provide means to express information needs in structured form; hence they are targeted towards developers and experts.  ...  The author thanks Leo Sauermann for initial inspiration, as well as the participants of the evaluation for their patience and support.  ... 
doi:10.1007/978-3-642-04930-9_34 fatcat:y2sd33q2sjbpjltr4ft3u5giom

Visual SPARQL querying based on extended filter/flow graphs

Florian Haag, Steffen Lohmann, Steffen Bold, Thomas Ertl
2014 Proceedings of the 2014 International Working Conference on Advanced Visual Interfaces - AVI '14  
Our approach supports most features of SPARQL and hence also the construction of complex query expressions.  ...  SPARQL is currently the major query language for the Semantic Web. However, writing SPARQL queries is not an easy task and requires some understanding of technologies like RDF.  ...  ACKNOWLEDGMENTS We would like to thank our student research assistants Sukanya Bhowmik and Hao Li for their assistance with the prototype implementation.  ... 
doi:10.1145/2598153.2598185 dblp:conf/avi/HaagLBE14 fatcat:wtp2prq35bdq7jgb4mw6htu2k4

Declaratively Describing Responses of Hypermedia-Driven Web APIs

Ruben Taelman, Ruben Verborgh
2017 Proceedings of the Knowledge Capture Conference on - K-CAP 2017  
We therefore explored techniques to represent this parameterized response structure in a generic but expressive way.  ...  In order to convey such expectations, interfaces need to declaratively describe the response structure of their parameterized hypermedia controls.  ...  Ruben Verborgh is a postdoctoral fellow of the Research Foundation -Flanders.  ... 
doi:10.1145/3148011.3154467 dblp:conf/kcap/TaelmanV17 fatcat:hoebfxxqrfahfmy3vamptbyi4u
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