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Sparql link 404 #290

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Sep 14, 2016
Merged

Sparql link 404 #290

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3e92952
Replace myexperiment link with one to W3C overview
mdlincoln Sep 12, 2016
1c6a320
Note that the Europeana endpoint is no longer supported
mdlincoln Sep 12, 2016
0ac9be7
Note that text may be updated in the future
mdlincoln Sep 12, 2016
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4 changes: 3 additions & 1 deletion lessons/graph-databases-and-SPARQL.md
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Expand Up @@ -462,6 +462,8 @@ ORDER BY DESC(?n)

## Linking multiple SPARQL endpoints

**2016-09-12: Unfortunately, Europeana has suspended their SPARQL endpoint until further notice, so the links in the following section are no longer operative. The text below will be retained as-is for reference purposes, and will be updated if and when Europeana renews their endpoint.**

Up until now, we have constructed queries that look for patterns in one dataset
alone. In the ideal world envisioned by Linked Open Data advocates, multiple
databases can be interlinked to allow very complex queries dependent on
Expand Down Expand Up @@ -601,8 +603,8 @@ searching, or doing other mathematical operations more complex than counting.
For a more complete rundown of the commands available in SPARQL, see these
links:

- [How to SPARQL](http://rdf.myexperiment.org/howtosparql?)
- [Wikibooks SPARQL tutorial](http://en.wikibooks.org/wiki/XQuery/SPARQL_Tutorial)
- [Full W3C Overview of SPARQL](https://www.w3.org/TR/sparql11-overview/)

Both the Europeana and Getty Vocabularies LOD sites also offer extensive, and
quite complex example queries which can be good sources for understanding how to
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