One thing that is immediately obvious from the triple pattern of SPARQL queries is that harvesting information from the Semantic Web is more complex than firing query terms at a database. SPARQL queries are addresses to specific locations in the RDF graph structure, and furthermore, the elements of a SPARQL query are themselves addresses.
URL: http://staff.washington.edu/tabrooks/SPARQL/watchThisSPARQL.htm
Keywords: SPARQL endpoint, DBpedia, Semantic Web, Linked Movie Database (LinkedMDB), MeSH (Medical Subject Headings)
Author: Brooks, Terrance
Publisher: Information Research
Language: http://id.loc.gov/vocabulary/iso639-2/eng
Time required: P1H
Interactivity type: mixed
- Accesses DBPedia's SNORQL/SPARQL endpoint and issues simple queries.
- Monitors and updates lists which report the status of SPARQL endpoints.
- Reads and understands high-level descriptions of the classes and properties of a dataset in order to write queries.
- Understands that a SPARQL query matches an RDF graph against a pattern of triples with fixed and variable values.
- Uses available tools, servers, and endpoints to issue queries against a dataset.