quantity_inference.py

import rdflib
from rdflib import RDF, OWL, RDFS, Namespace
import owlready2

BRICK_VERSION = '1.1.0'
BRICK = Namespace("https://brickschema.org/schema/{0}/Brick#".format(BRICK_VERSION))
TAG = Namespace("https://brickschema.org/schema/{0}/BrickTag#".format(BRICK_VERSION))
SKOS = Namespace("http://www.w3.org/2004/02/skos/core#")

def rereason(G, filename):
    world = owlready2.World()
    with open(filename,'wb') as f:
        f.write(G.serialize(format='ntriples'))
    on = world.get_ontology(f"file://./{filename}").load()
    owlready2.sync_reasoner(world, infer_property_values =True)
    G = world.as_rdflib_graph()
    G.bind('rdf', RDF)
    G.bind('owl', OWL)
    G.bind('rdfs', RDFS)
    G.bind('brick', BRICK)
    G.bind('tag', TAG)
    return G

g = rdflib.Graph()
g.parse('Brick.ttl', format='turtle')
expanded_g = rereason(g, 'Brick_inferred.n3')

q_prefix = """
prefix brick: <https://brickschema.org/schema/1.1.0/Brick#>
prefix owl: <http://www.w3.org/2002/07/owl#>
"""

qstr = q_prefix + """
select ?a where {
?a a brick:Quantity.
}
"""

for row in expanded_g.query(qstr):
    print(row)

print('This should not print anything.')