The project Linked Data for Professional Education (LD4PE), funded between 2014 and 2017 by the Institute of Museum and Library Studies (IMLS) and lead by the University of Washington Information School, developed a web-based exploratorium to support structured discovery of online learning resources about Linked Data. The project produced this website, which has been converted into a static site for preservation, and a Linked Data Competency Index. DCMI will keep this site online on a "best effort" basis as long as resources permit. The Internet Archive's Wayback Machine should be regarded as the source of archival copies for the long term.
This brief tutorial shows that another way of dealing with the semi-structured nature of RDF data is to query for one of a number of possibilities. This section covers UNION patterns, where one of a number of possibilities is tried.
URL: http://jena.apache.org/tutorials/sparql_union.html
Keywords: SPARQL
Publisher: The Apache Software Foundation
Language: http://id.loc.gov/vocabulary/iso639-2/eng
Time required: P10M
Educational audience: student
Interactivity type: mixed
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