Filters








529 Hits in 5.8 sec

Querying Wikidata: Comparing SPARQL, Relational and Graph Databases [chapter]

Daniel Hernández, Aidan Hogan, Cristian Riveros, Carlos Rojas, Enzo Zerega
2016 Lecture Notes in Computer Science  
We take two popular SPARQL databases (Virtuoso, Blazegraph), a popular relational database (PostgreSQL), and a popular graph database (Neo4J) for comparison and discuss various options as to how Wikidata  ...  In this paper, we experimentally compare the eciency of various database engines for the purposes of querying the Wikidata knowledge-base, which can be conceptualised as a directed edge-labelled graph  ...  Work Related The goal of our work was to compare SPARQL, relational and graph databases for the purposes of querying Wikidata.  ... 
doi:10.1007/978-3-319-46547-0_10 fatcat:dtakbg7ma5erzieijroyp7w7cy

Navigating the Maze of Wikidata Query Logs

Angela Bonifati, Wim Martens, Thomas Timm
2019 The World Wide Web Conference on - WWW '19  
This paper provides an in-depth and diversified analysis of the Wikidata query logs, recently made publicly available.  ...  Although the usage of Wikidata queries has been the object of recent studies, our analysis of the query traffic reveals interesting and unforeseen findings concerning the usage, types of recursion, and  ...  CONCLUSIONS AND LESSONS LEARNED We have presented an in-depth analysis of the recently released Wikidata query logs and highlighted the presence of their most prominent query fragment, i.e. C2RPQs.  ... 
doi:10.1145/3308558.3313472 dblp:conf/www/BonifatiMT19 fatcat:yej2ru6c7ne7valoqkqs74f42q

Creating and Querying Personalized Versions of Wikidata on a Laptop [article]

Hans Chalupsky, Pedro Szekely, Filip Ilievski, Daniel Garijo, Kartik Shenoy
2021 arXiv   pre-print
This paper introduces KGTK Kypher, a query language and processor that allows users to create personalized variants of Wikidata on a laptop.  ...  The Kypher queries for these use cases run much faster on a laptop than the equivalent SPARQL queries on a Wikidata clone running on a powerful server with 24h time-out limits.  ...  Experiments We performed experiments to compare the execution times of the Kypher and SPARQL implementations of the queries for the use cases presented in this paper.  ... 
arXiv:2108.07119v2 fatcat:zlf5p53i7bgshphmktqtxnyor4

Wikidata

Denny Vrandečić
2012 Proceedings of the 21st international conference companion on World Wide Web - WWW '12 Companion  
We thank the work of the larger Wikidata:WikiProject COVID-19 community in which we operated, Wikidata volunteers in general, and in particular Ralf Stephan, Daniel Mietchen, and Finn  ...  for coronaviruses, mappings were extracted from Wikidata with a SPARQL query for the seven human coronaviruses and the SARS-related viruses.  ...  Wikidata follows the linked data principles offering both HTML and RDF views of every item with their corresponding links to related items, and a SPARQL endpoint called the Wikidata Query Service.  ... 
doi:10.1145/2187980.2188242 dblp:conf/www/Vrandecic12 fatcat:rggc433zknee7neoqs3lr5ol6a

Schema Inference on Wikidata

Lucas Werkmeister, Maria Koutraki, Harald Sack, Ralf Reussner
2018 Zenodo  
Wikidata, the free knowledge base in the Wikimedia movement, is used by various Wikimedia projects and third parties to provide machine-readable information and data.  ...  Wikidata community.  ...  This graph can then be queried using the SPARQL Protocol and RDF Query Language (SPARQL) [15] . For a more detailed introduction to RDF and related technologies, see the RDF 1.1 Primer [13] .  ... 
doi:10.5281/zenodo.2578259 fatcat:grifujdylnh3pbdcjq6a6ula6q

Scholia, Scientometrics and Wikidata [chapter]

Finn Årup Nielsen, Daniel Mietchen, Egon Willighagen
2017 Lecture Notes in Computer Science  
To collect the data, it queries the SPARQL-based Wikidata Query Service.  ...  topic networks and citation graphs.  ...  We would also like to thank Magnus Manske, James Hare, Tom Arrow, Andra Waagmeester, and Sebastian Burgstaller-Muehlbacher for considerable work with Wikidata tools and data in the context of WikiCite.  ... 
doi:10.1007/978-3-319-70407-4_36 fatcat:dc4thxpvejeo5cinafhkfyvscq

Scholia And Scientometrics With Wikidata

Finn Årup Nielsen, Daniel Mietchen, Egon Willighagen
2017 Zenodo  
To collect the data, it queries the SPARQL-based Wikidata Query Service.  ...  and citation graphs.  ...  We would also like to thank Magnus Manske and James Hare for considerable work with Wikidata tools and data in the context of WikiCite.  ... 
doi:10.5281/zenodo.1036595 fatcat:druo37rerfembknfxzh4b7x6qy

GeneDB and Wikidata

Magnus Manske, Ulrike Böhme, Christoph Püthe, Matt Berriman
2019 Wellcome Open Research  
Publishing authoritative genomic annotation data, keeping it up to date, linking it to related information, and allowing community annotation is difficult and hard to support with limited resources.  ...  Here, we show how importing GeneDB annotation data into Wikidata allows for leveraging existing resources, integrating volunteer and scientific communities, and enriching the original information.  ...  Web pages for genes, proteins, species, chromosomes, GO term 13 queries, and searches are generated on-the-fly utilising the Wikidata API and SPARQL interface, and Wikidata serves as the only back-end  ... 
doi:10.12688/wellcomeopenres.15355.1 pmid:31723674 pmcid:PMC6823904 fatcat:v6t5alkwnnf6ppnmufn7un6jw4

GeneDB and Wikidata

Magnus Manske, Ulrike Böhme, Christoph Püthe, Matt Berriman
2019 Wellcome Open Research  
Publishing authoritative genomic annotation data, keeping it up to date, linking it to related information, and allowing community annotation is difficult and hard to support with limited resources.  ...  Here, we show how importing GeneDB annotation data into Wikidata allows for leveraging existing resources, integrating volunteer and scientific communities, and enriching the original information.  ...  Data are imported and made available via the Wikidata API and the Wikidata SPARQL endpoint, allowing users of the data powerful queries.  ... 
doi:10.12688/wellcomeopenres.15355.2 fatcat:3mna644b3fgbtiycec7cndod4y

Scholia and scientometrics with Wikidata [article]

Finn Årup Nielsen, Daniel Mietchen, Egon Willighagen
2017 arXiv   pre-print
To collect the data, it queries the SPARQL-based Wikidata Query Service.  ...  citation graphs.  ...  We would also like to thank Magnus Manske and James Hare for considerable work with Wikidata tools and data in the context of WikiCite.  ... 
arXiv:1703.04222v2 fatcat:c7ze65f4n5bdznyqst4x5jpice

Wikidata from a Research Perspective – A Systematic Mapping Study of Wikidata [article]

Mariam Farda-Sarbas, Claudia Müller-Birn
2019 arXiv   pre-print
These especially include aspects concerning data quality, including questions related to language coverage and data integrity.  ...  Wikidata is one of the most edited knowledge bases which contains structured data. It serves as the data source for many projects in the Wikimedia sphere and beyond.  ...  [30] compare various options for reifying RDF triples from Wikidata, and building on that study the efficiency of various database engines for querying Wikidata [31] .  ... 
arXiv:1908.11153v2 fatcat:qat4hakfgzgotl3hcdwgowyvvi

Benchmarking Graph Database Backends—What Works Well with Wikidata?

Tibor Kovács, Gábor Simon, Gergely Mezei
2019 Acta Cybernetica  
Graph databases come in all shapes and sizes, offer different APIs and graph models. Hence we used a measurement system, that can abstract away the API differences.  ...  In this paper, we benchmark different graph database implementations loaded with Wikidata, a real-life, large-scale knowledge base.  ...  ) on selected graph databases, triple stores, and relational engines.  ... 
doi:10.14232/actacyb.24.1.2019.5 fatcat:yuzxs6iykbf2digepn2bse34lm

Wikidata and COVID-19: Creating a collaborative knowledge graph from CORD-19 scholarly publications

Houcemeddine Turki
2020 Zenodo  
Then, I outline the tools for the enrichment of COVID-19 information on Wikidata as well as the knowledge graph validation methods applicable to COVID-19 knowledge.  ...  Finally, I describe the COVID-19 information in Wikidata and discuss its usefulness in supporting human decisions and social recommendations about the infectious disease.  ...  • Deriving the data model of classes by analyzing the characteristics of COVID-19 knowledge in Wikidata using full screening and SPARQL queries.  ... 
doi:10.5281/zenodo.4048515 fatcat:h2muoepfrvg5tgz7dfbali4tpu

Wikidata and COVID-19: Creating a collaborative knowledge graph from CORD-19 scholarly publications

Houcemeddine Turki
2020 Zenodo  
Then, I outline the tools for the enrichment of COVID-19 information on Wikidata as well as the knowledge graph validation methods applicable to COVID-19 knowledge.  ...  Finally, I describe the COVID-19 information in Wikidata and discuss its usefulness in supporting human decisions and social recommendations about the infectious disease.  ...  • Deriving the data model of classes by analyzing the characteristics of COVID-19 knowledge in Wikidata using full screening and SPARQL queries.  ... 
doi:10.5281/zenodo.4049977 fatcat:2jwvpj3kwnespkcpysv2wgtivu

Wikidata and COVID-19: Creating a collaborative knowledge graph from CORD-19 scholarly publications

Houcemeddine Turki
2020 Zenodo  
Then, I outline the tools for the enrichment of COVID-19 information on Wikidata as well as the knowledge graph validation methods applicable to COVID-19 knowledge.  ...  Finally, I describe the COVID-19 information in Wikidata and discuss its usefulness in supporting human decisions and social recommendations about the infectious disease.  ...  • Deriving the data model of classes by analyzing the characteristics of COVID-19 knowledge in Wikidata using full screening and SPARQL queries.  ... 
doi:10.5281/zenodo.4051192 fatcat:kafbmx6q6vftxbu2wc7vq53tke
« Previous Showing results 1 — 15 out of 529 results