My FOAF network #5: SPARQL-ing my network
Creators & Contributors
FOAF rulez: it's RDF. With RDF comes SPARQL. SPARQL needs a query engine, however. And there comes OpenRDF which created Sesame. I have to catch the train in about 15 minutes, so will not elaborate too much, but here are some Sesame 2.0.1 work:
> create native.
Please specify values for the following variables:
Repository ID [native]: foafRepo
Repository title [Native store]: FOAF Repository
Triple indexes [spoc,posc]:
Repository created
> open foafRepo
Creates me a new RDF storage and opens it.
foafRepo> load http://blueobelisk.sourceforge.net/people/egonw/foaf.xrdf .
Loading data...
Data has been added to the repository (606 ms)
Loads my FOAF file. Now, a simple SPARQL query that finds me all friends that now someone with the nick egonw:
foafRepo> sparql
BASE <http://blueobelisk.sourceforge.net/people/egonw/foaf.xrdf>
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
SELECT ?s ?o
WHERE { ?s foaf:knows ?o ; foaf:nick "egonw" . }
.
Evaluating query...
+-------------------------------------+-------------------------------------+
| s | o |
+-------------------------------------+-------------------------------------+
| <http://blueobelisk.sourceforge.net/people/egonw/foaf.xrdf#me>| <http://blueobelisk.sourceforge.net/people/egonw/foaf.xrdf#HenryRzepa>|
| <http://blueobelisk.sourceforge.net/people/egonw/foaf.xrdf#me>| <http://blueobelisk.sourceforge.net/people/egonw/foaf.xrdf#CarstenNiehaus>|
| <http://blueobelisk.sourceforge.net/people/egonw/foaf.xrdf#me>| <http://blueobelisk.sourceforge.net/people/egonw/foaf.xrdf#RajarshiGuha>|
| <http://blueobelisk.sourceforge.net/people/egonw/foaf.xrdf#me>| <http://blueobelisk.sourceforge.net/people/egonw/foaf.xrdf#JeanClaudeBradley>|
| <http://blueobelisk.sourceforge.net/people/egonw/foaf.xrdf#me>| <http://blueobelisk.sourceforge.net/people/egonw/foaf.xrdf#GeoffHutchison>|
| <http://blueobelisk.sourceforge.net/people/egonw/foaf.xrdf#me>| <http://blueobelisk.sourceforge.net/people/egonw/foaf.xrdf#ChristophSteinbeck>|
| <http://blueobelisk.sourceforge.net/people/egonw/foaf.xrdf#me>| <http://blueobelisk.sourceforge.net/people/egonw/foaf.xrdf#PeterMurrayRust>|
| <http://blueobelisk.sourceforge.net/people/egonw/foaf.xrdf#me>| <http://blueobelisk.sourceforge.net/people/egonw/foaf.xrdf#TobiasHelmus>|
| <http://blueobelisk.sourceforge.net/people/egonw/foaf.xrdf#me>| <http://blueobelisk.sourceforge.net/people/egonw/foaf.xrdf#StefanKuhn>|
| <http://blueobelisk.sourceforge.net/people/egonw/foaf.xrdf#me>| <http://blueobelisk.sourceforge.net/people/egonw/foaf.xrdf#MartinEklund>|
| <http://blueobelisk.sourceforge.net/people/egonw/foaf.xrdf#me>| <http://blueobelisk.sourceforge.net/people/egonw/foaf.xrdf#JohannesWagener>|
| <http://blueobelisk.sourceforge.net/people/egonw/foaf.xrdf#me>| <http://blueobelisk.sourceforge.net/people/egonw/foaf.xrdf#JarlWikberg>|
| <http://blueobelisk.sourceforge.net/people/egonw/foaf.xrdf#me>| <http://blueobelisk.sourceforge.net/people/egonw/foaf.xrdf#JeromePansanel>|
+-------------------------------------+-------------------------------------+
13 result(s) (15 ms)
Not very pretty, but rather accurate.
More SPARQL fun later. Do try this at home, but make sure to not put a period at the end of a line in your SPARQL query! :)
Additional details
Description
FOAF rulez: it's RDF. With RDF comes SPARQL. SPARQL needs a query engine, however. And there comes OpenRDF which created Sesame.
Identifiers
- UUID
- ae8e197e-9ffd-40fb-81a5-dae46f6dc6cc
- GUID
- https://doi.org/10.59350/f6q3q-d2e52
- URL
- https://chem-bla-ics.linkedchemistry.info/2008/03/19/my-foaf-network-5-sparql-ing-my-network.html
Dates
- Issued
-
2008-03-19T00:00:00
- Updated
-
2008-03-19T00:00:00