sparqlprog 0.0.3

Execute logic program queries against a remote SPARQL endpoint

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']}")

Example Notebooks

See:

• Notebook_01_Basics

• Notebook_02_Programs

Installation

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)”