3 Search Results for "Corcho, Oscar"


Document
Citizen Science: Design and Engagement (Dagstuhl Seminar 17272)

Authors: Irene Celino, Oscar Corcho, Franz Hölker, and Elena Simperl

Published in: Dagstuhl Reports, Volume 7, Issue 7 (2018)


Abstract
This report documents the program and the outcomes of Dagstuhl Seminar 17272 "Citizen Science: Design and Engagement". In this report, we detail the briefly summarise the content of three invited keynote talks and two invited tutorials. We further outline the findings of five parallel working groups, which met on the first and third day of the workshop, in the areas of: sustainability, measuring success, community engagement, linking and quality.

Cite as

Irene Celino, Oscar Corcho, Franz Hölker, and Elena Simperl. Citizen Science: Design and Engagement (Dagstuhl Seminar 17272). In Dagstuhl Reports, Volume 7, Issue 7, pp. 22-43, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2018)


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@Article{celino_et_al:DagRep.7.7.22,
  author =	{Celino, Irene and Corcho, Oscar and H\"{o}lker, Franz and Simperl, Elena},
  title =	{{Citizen Science: Design and Engagement (Dagstuhl Seminar 17272)}},
  pages =	{22--43},
  journal =	{Dagstuhl Reports},
  ISSN =	{2192-5283},
  year =	{2018},
  volume =	{7},
  number =	{7},
  editor =	{Celino, Irene and Corcho, Oscar and H\"{o}lker, Franz and Simperl, Elena},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagRep.7.7.22},
  URN =		{urn:nbn:de:0030-drops-84216},
  doi =		{10.4230/DagRep.7.7.22},
  annote =	{Keywords: Citizen science, Crowdsourcing, Data Analytics, Gamification, Human Computation, Incentives Engineering, Online Community, Open Science}
}
Document
CONSTRUCT Queries in SPARQL

Authors: Egor V. Kostylev, Juan L. Reutter, and Martín Ugarte

Published in: LIPIcs, Volume 31, 18th International Conference on Database Theory (ICDT 2015)


Abstract
SPARQL has become the most popular language for querying RDF datasets, the standard data model for representing information in the Web. This query language has received a good deal of attention in the last few years: two versions of W3C standards have been issued, several SPARQL query engines have been deployed, and important theoretical foundations have been laid. However, many fundamental aspects of SPARQL queries are not yet fully understood. To this end, it is crucial to understand the correspondence between SPARQL and well-developed frameworks like relational algebra or first order logic. But one of the main obstacles on the way to such understanding is the fact that the well-studied fragments of SPARQL do not produce RDF as output. In this paper we embark on the study of SPARQL CONSTRUCT queries, that is, queries which output RDF graphs. This class of queries takes rightful place in the standards and implementations, but contrary to SELECT queries, it has not yet attracted a worth-while theoretical research. Under this framework we are able to establish a strong connection between SPARQL and well-known logical and database formalisms. In particular, the fragment which does not allow for blank nodes in output templates corresponds to first order queries, its well-designed sub-fragment corresponds to positive first order queries, and the general language can be re-stated as a data exchange setting. These correspondences allow us to conclude that the general language is not composable, but the aforementioned blank-free fragments are. Finally, we enrich SPARQL with a recursion operator and establish fundamental properties of this extension.

Cite as

Egor V. Kostylev, Juan L. Reutter, and Martín Ugarte. CONSTRUCT Queries in SPARQL. In 18th International Conference on Database Theory (ICDT 2015). Leibniz International Proceedings in Informatics (LIPIcs), Volume 31, pp. 212-229, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2015)


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@InProceedings{kostylev_et_al:LIPIcs.ICDT.2015.212,
  author =	{Kostylev, Egor V. and Reutter, Juan L. and Ugarte, Mart{\'\i}n},
  title =	{{CONSTRUCT Queries in SPARQL}},
  booktitle =	{18th International Conference on Database Theory (ICDT 2015)},
  pages =	{212--229},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-939897-79-8},
  ISSN =	{1868-8969},
  year =	{2015},
  volume =	{31},
  editor =	{Arenas, Marcelo and Ugarte, Mart{\'\i}n},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ICDT.2015.212},
  URN =		{urn:nbn:de:0030-drops-49866},
  doi =		{10.4230/LIPIcs.ICDT.2015.212},
  annote =	{Keywords: RDF, SPARQL, Query Languages}
}
Document
Semantic Data Management (Dagstuhl Seminar 12171)

Authors: Grigoris Antoniou, Oscar Corcho, Karl Aberer, Elena Simperl, and Rudi Studer

Published in: Dagstuhl Reports, Volume 2, Issue 4 (2012)


Abstract
This report documents the program and the outcomes of Dagstuhl Seminar 12171 "Semantic Data Management". The purpose of the seminar was to have a fruitful exchange of ideas between the semantic web, database systems and information retrieval communities, organised across four main themes: scalability, provenance, dynamicity and search. Relevant key questions cutting across all of these themes were: (i) how can existing DB and IR solutions be adapted to manage semantic data; and (ii) are there new challenges that arise for the DB and IR communities (i.e. are radically new techniques required)? The outcome was a deeper, more integrated understanding of the current state of the art on semantic data management and a the identification of a set of open challenges that will inform the three communities in this intersection.

Cite as

Grigoris Antoniou, Oscar Corcho, Karl Aberer, Elena Simperl, and Rudi Studer. Semantic Data Management (Dagstuhl Seminar 12171). In Dagstuhl Reports, Volume 2, Issue 4, pp. 39-65, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2012)


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@Article{antoniou_et_al:DagRep.2.4.39,
  author =	{Antoniou, Grigoris and Corcho, Oscar and Aberer, Karl and Simperl, Elena and Studer, Rudi},
  title =	{{Semantic Data Management (Dagstuhl Seminar 12171)}},
  pages =	{39--65},
  journal =	{Dagstuhl Reports},
  ISSN =	{2192-5283},
  year =	{2012},
  volume =	{2},
  number =	{4},
  editor =	{Antoniou, Grigoris and Corcho, Oscar and Aberer, Karl and Simperl, Elena and Studer, Rudi},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagRep.2.4.39},
  URN =		{urn:nbn:de:0030-drops-35976},
  doi =		{10.4230/DagRep.2.4.39},
  annote =	{Keywords: Semantic data, Semantic Web, Linked Data, Large-scale data management, Dynamicity and stream processing, Provenance and access control, Information retrieval and ranking}
}
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