student – Linked Data for Professional Education https://ld4pe.dublincore.org Learning resources tagged by competency Thu, 19 Nov 2020 14:45:03 +0000 en-US hourly 1 https://wordpress.org/?v=4.9.16 0 to 60 on SPARQL Queries in 50 Minutes https://ld4pe.dublincore.org/learning_resource/0-to-60-on-sparql-queries-in-50-minutes-3/ Sun, 06 May 2018 02:22:48 +0000 https://ld4pe.dublincore.org/learning_resource/0-to-60-on-sparql-queries-in-50-minutes-3/ This webinar provides an introduction to SPARQL, a query language for RDF. Users will gain hands on experience crafting queries, starting simply, but evolving in complexity. These queries will focus on coinage data in the SPARQL endpoint hosted by http://nomisma.org with numismatic concepts defined in a SKOS-based thesaurus and physical specimens from three major museum collections (American Numismatic Society, British Museum, and Münzkabinett of the Staatliche Museen zu Berlin) linked to these concepts. Results generated from these queries in the form of CSV may be imported directly into Google Fusion Tables for immediate visualization in the form of charts and maps. Links to all resources necessary to practice the queries covered are available online and referenced from the webinar presentation.

The webinar uses the following SPARQL constructs: SELECT, WHERE, LIMIT, ORDER BY (ASC), FILTER, DISTINCT, regex(), count(), lang(), langMatches().

Access to all SPARQL queries used in the webinar are available at http://numishare.blogspot.com/2015_05_01_archive.

URL: https://www.asist.org/events/webinars/dcmi-webinar-from-0-to-60-on-sparql-queries-in-50-minutes/
Keywords: visualization (map geolocations), Google Fusion Tables, visualization (statistics), geographic queries, UNION, OPTIONAL, sorting, filtering, SPARQL syntax
Author: Ethan Gruber
Publisher: DCMI
Date created: 2014-01-01 07:00:00.000
Language: http://id.loc.gov/vocabulary/iso639-2/eng
Time required: P1H00M
Educational use: instruction
Educational audience: student
Interactivity type: mixed

]]> Swagger, the API Economy, REST, Linked Data, and a Semantic Web https://ld4pe.dublincore.org/learning_resource/swagger-the-api-economy-rest-linked-data-and-a-semantic-web/ Sat, 19 Aug 2017 08:28:00 +0000 https://ld4pe.dublincore.org/learning_resource/swagger-the-api-economy-rest-linked-data-and-a-semantic-web/ In this blog post, the author presents the following situation analysis: The network commonly referred to as the World Wide Web (“Web”) is built upon the powerful duality delivered by a HTTP URI (“Hyperlink”). Hypermedia (Webby Content) is Document Content that includes hyperlinks, which may or may not include explicit controls for Hyperlink lookup (or dereference). Notations for creating RDF document content e.g., (RDF-Turtle or JSON-LD) don’t include explicit Hyperlink-lookup controls. This has led to a false dichotomy has arisen across the communities of so-called “Web Developers” (who prefer explicit Hyperlink-lookup controls) and don’t necessarily see the need for HTTP URI opacity. The author argues that "the notion of a Semantic Web of Linked Data and REST-ful interactions using APIs aren’t in anyway mutually exclusive". He presents an example (with screenshots) showing how a single instance of OpenLink Smart Data Bot (OSDB), combined with the use of several other tools, provides a REST-ful interaction point for engaging a variety of Actions extracted from a variety of APIs documented using Swagger and/or RDF documents.

URL: https://medium.com/openlink-software-blog/swagger-the-api-economy-rest-linked-data-and-a-semantic-web-9d6839dae65a
Keywords: REST (Representational State Transfer), Web APIs, OpenLink Smart Data Bot (OSDB), DBpedia, Virtuoso, CURL
Author: Idehen, Kingsley Uyi
Publisher: OpenLink Software
Date created: 2017-06-24 04:00:00.000
Language: http://id.loc.gov/vocabulary/iso639-2/eng
Time required: P45M
Educational use: instruction
Educational audience: student
Interactivity type: mixed

]]> Don’t Use a Hammer to Screw in a Nail: Alternatives to REGEX in SPARQL https://ld4pe.dublincore.org/learning_resource/dont-use-a-hammer-to-screw-in-a-nail-alternatives-to-regex-in-sparql/ Sun, 13 Aug 2017 08:18:11 +0000 https://ld4pe.dublincore.org/learning_resource/dont-use-a-hammer-to-screw-in-a-nail-alternatives-to-regex-in-sparql/ This brief blog post explains that regular expressions are expensive to evaluate regardless of what language you are using them in. The author suggests that if you can avoid using a regular expression in favor of a simpler string computation, then you can likely get much better performance out of your SPARQL engine. Alternative strategies include using CONTAINS, LCASE, UCASE, STRSTARTS, and STRENDS. If more complex string operations are required, full-text extensions to the SPARQL engine may be an option.

URL: http://www.cray.com/blog/dont-use-hammer-screw-nail-alternatives-regex-sparql/
Keywords: SPARQL, CONTAINS, String operations, REGEX, Jena Text
Author: Vesse, Rob
Publisher: Cray
Date created: 2014-06-03 04:00:00.000
Language: http://id.loc.gov/vocabulary/iso639-2/eng
Time required: P10M
Educational use: instruction
Educational audience: student
Interactivity type: expositive

]]> Equality and Inequality in SPARQL https://ld4pe.dublincore.org/learning_resource/equality-and-inequality-in-sparql/ Sun, 13 Aug 2017 08:18:11 +0000 https://ld4pe.dublincore.org/learning_resource/equality-and-inequality-in-sparql/ This brief blog post discusses issues surrounding expression semantics in SPARQL. Practices that people are used to from other languages (like the use of "=" and "!="), can often be confusing to new – and even not so new- SPARQL developers. The author suggests that an awareness of type errors will allow the user to understand what is occurring. Example queries show how type errors are treated when using FILTER. An alternative method involving project expressions or BIND is proposed.

URL: http://www.cray.com/blog/equality-inequality-sparql/
Keywords: SPARQL, BIND, FILTER, Type errors, Project expressions
Author: Vesse, Rob
Publisher: Cray
Date created: 2013-04-23 04:00:00.000
Language: http://id.loc.gov/vocabulary/iso639-2/eng
Time required: P10M
Educational use: instruction
Educational audience: student
Interactivity type: expositive

]]> Maximising (Re)Usability of Library Metadata Using Linked Data https://ld4pe.dublincore.org/learning_resource/maximising-reusability-of-library-metadata-using-linked-data/ Sun, 06 Aug 2017 07:58:04 +0000 https://ld4pe.dublincore.org/learning_resource/maximising-reusability-of-library-metadata-using-linked-data/ In this video, the speaker explores challenges related to the re-usability of library linked metadata in the field of cultural heritage- and for other purposes. She argues that it is crucial that published Linked Data accurately represent core aspects of the original metadata related to language, provenance, license, and dataset metadata. The speaker proposes a "proper representation" of these features using W3C standards, best practices and guidelines for multilingual Linked Open Data.

URL: https://www.youtube.com/watch?v=IIDXZ-wj4Vs
Keywords: Libraries, Archives, and Museums (LAMs), Lemon (Lexicon Model for Ontologies), Linguistic Linked Open Data, VoID (Vocabulary of Interlinked Datasets), BabelNet
Author: Pérez, Asunción Gómez
Publisher: Technical University of Madrid
Date created: 2015-12-11 05:00:00.000
Language: http://id.loc.gov/vocabulary/iso639-2/eng
Time required: P1H
Educational use: professionalDevelopment
Educational audience: student
Interactivity type: expositive

]]> SKOS and Linked Data https://ld4pe.dublincore.org/learning_resource/skos-and-linked-data/ Sun, 06 Aug 2017 07:58:04 +0000 https://ld4pe.dublincore.org/learning_resource/skos-and-linked-data/ This slideshare presentation introduces SKOS and explains how it can be used to represent RDF in a simple way. It explains how SKOS differs from OWL a more formal system of semantics. Along the way, basic Linked Data Principles are explained. Includes links to references and demos, which explain the benefits of using SKOS as well as areas that need to be developed further.

URL: https://www.slideshare.net/antoineisaac/skos-and-linked-data
Keywords: SKOS (Simple Knowledge Organization System), KOS (Knowledge Organization System), Thesaurus, Labels
Author: Isaac, Antoine
Publisher: Europeana
Date created: 2010-09-14 04:00:00.000
Language: http://id.loc.gov/vocabulary/iso639-2/eng
Time required: P20M
Educational use: professionalDevelopment
Educational audience: student
Interactivity type: expositive

]]> SPARQL Package for R: Movie Star Graph Visualization Tutorial https://ld4pe.dublincore.org/learning_resource/sparql-package-for-r-movie-star-graph-visualization-tutorial/ Sun, 06 Aug 2017 07:58:04 +0000 https://ld4pe.dublincore.org/learning_resource/sparql-package-for-r-movie-star-graph-visualization-tutorial/ The SPARQL Package allows you to directly import results of SPARQL SELECT queries into the statistical environment of R as a data frame, allowing one to directly perform statistical analysis on datasets on the web. This tutorial shows how to do a visual analysis with the Gephi graph visualization tool, and basic social network analysis with R of the data in the DBpedia repository about Hollywood movies. It makes use of the SPARQL Package for R and the igraph library.

URL: http://linkedscience.org/tools/sparql-package-for-r/sparql-package-for-r-gephi-movie-star-graph-visualization-tutorial/
Keywords: R (programming language), Linked Open Data (LOD), Statistical analysis, Data visualization, Gephi
Author: van Hage, Willem Robert
Publisher: COMBINE project
Language: http://id.loc.gov/vocabulary/iso639-2/eng
Time required: P90M
Educational use: instruction
Educational audience: student
Interactivity type: mixed

]]> Using the SPARQL Package in R to Handle Spatial Linked Data: Part II https://ld4pe.dublincore.org/learning_resource/using-the-sparql-package-in-r-to-handle-spatial-linked-data-part-ii/ Sun, 06 Aug 2017 07:58:04 +0000 https://ld4pe.dublincore.org/learning_resource/using-the-sparql-package-in-r-to-handle-spatial-linked-data-part-ii/ Continuing where Part I left off, this tutorial shows how to access Spatial and Temporal Data about the complex environmental system of the Brazilian Amazon Rainforest, including deforestation statistics, and a variety of socio-economic variables. It shows how store this data in a meaningful way and how to plot and handle it within R.

URL: http://linkedscience.org/tools/sparql-package-for-r/tutorial-part-ii-calculating-deforestation-per-state/
Keywords: R (programming language), Linked Open Data (LOD), Statistical analysis, Data visualization
Author: Gräler, Benedikt
Publisher: COMBINE project
Language: http://id.loc.gov/vocabulary/iso639-2/eng
Time required: P30M
Educational use: instruction
Educational audience: student
Interactivity type: mixed

]]> Using the SPARQL Package in R to Handle Spatial Linked Data: Part I https://ld4pe.dublincore.org/learning_resource/using-the-sparql-package-in-r-to-handle-spatial-linked-data-part-i/ Sun, 06 Aug 2017 07:58:04 +0000 https://ld4pe.dublincore.org/learning_resource/using-the-sparql-package-in-r-to-handle-spatial-linked-data-part-i/ As a solution to bridge two communities, those of statistical computing and the Semantic Web, there is now the SPARQL Package for R, which enables one to retrieve data from Linked Data services for analysis. This tutorial shows
how to access Spatial and Temporal Data about the complex environmental system of the Brazilian Amazon Rainforest, including deforestation statistics, and a variety of socio-economic variables. It shows how store this data in a meaningful way and how to plot and handle it within R.

URL: http://linkedscience.org/tools/sparql-package-for-r/tutorial-on-sparql-package-for-r/
Keywords: R (programming language), Linked Open Data (LOD), Statistical analysis, Data visualization
Author: Gräler, Benedikt
Publisher: COMBINE project
Language: http://id.loc.gov/vocabulary/iso639-2/eng
Time required: P30M
Educational use: instruction
Educational audience: student
Interactivity type: mixed

]]> SPARQL Package for R: Linked Open Piracy Tutorial https://ld4pe.dublincore.org/learning_resource/sparql-package-for-r-linked-open-piracy-tutorial/ Sun, 06 Aug 2017 07:58:04 +0000 https://ld4pe.dublincore.org/learning_resource/sparql-package-for-r-linked-open-piracy-tutorial/ This tutorial shows how to do a visual analysis and basic statistical analysis of the data in the Linked Open Piracy data set. It makes use of the SPARQL Package for R and the ggmap package. The SPARQL Package allows one to directly import results of SPARQL SELECT queries into the statistical environment of R as a data frame, allowing one to directly perform statistical analysis on datasets from the web.

URL: http://linkedscience.org/tools/sparql-package-for-r/linked-open-piracy-tutorial/
Keywords: R (programming language), Linked Open Data (LOD), Statistical analysis, Data visualization
Author: van Hage, Willem Robert
Publisher: COMBINE project
Language: http://id.loc.gov/vocabulary/iso639-2/eng
Time required: P1H
Educational use: instruction
Educational audience: student
Interactivity type: mixed

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