This module wraps sparqlprog, providing a Python API for executing logic program queries over SPARQL endpoints.
Example:
from prologterms import TermGenerator, PrologRenderer, Program, Var
from sparqlprog import SPARQLProg
P = TermGenerator()
S = SPARQLProg(endpoint='wd')
C = Var('C')
N = Var('N')
# logic programming query: continent(C), enlabel(C,N)
query = (P.continent(C), P.enlabel(C, N))
for r in S.query(query):
print(f"{r['C']} {r['N']}")See:
To install
python3 -m venv venv source venv/bin/activate export PYTHONPATH=.:$PYTHONPATH pip install -r requirements.txt
You will need access to a sparqlprog service. You can use the public one on Heroku (default) or run your own.
Running your own is easy if you have Docker:
docker run -p 9083:9083 cmungall/sparqlprog
You can then pass http://localhost:9083 as the service URL
parameter. E.g
Query wikidata for continents and their names:
./sparqlprog.py -u http://localhost:9083 -e wd “continent(X),enlabel(X,N)”
You can also use the default service on heroku, but it is not guaranteed to be running:
./sparqlprog.py -e wd “continent(X), enlabel(X,N)”