ontology

ontology = '/full/path/ontology.owl'
world = default_world
fileno, filename = tempfile.mkstemp()
world.set_backend(filename = filename)
onto = world.get_ontology(ontology).load()

with onto:
    patient = onto.search_one(label='Patient')
    fev = onto.search_one(label='FEV')

    has_value = onto.search_one(label='hasValue')
    has_assessment = onto.search_one(label='hasAssessment')
    has_gold_stage = onto.search_one(label='hasGOLDStage')

    gold_rules = [
        f"""{patient.iri}(?p), {fev.iri}(?f), {has_assessment.iri}(?p, ?f), {has_value.iri}(?f, ?v),
            greaterThanOrEqual(?v, 80) -> {has_gold_stage.iri}(?p, 1)""",
        f"""{patient.iri}(?p), {fev.iri}(?f), {has_assessment.iri}(?p, ?f), {has_value.iri}(?f, ?v),
            greaterThanOrEqual(?v, 50), lessThan(?v, 80) -> {has_gold_stage.iri}(?p, 2)""",
        f"""{patient.iri}(?p), {fev.iri}(?f), {has_assessment.iri}(?p, ?f), {has_value.iri}(?f, ?v),
            greaterThanOrEqual(?v, 30), lessThan(?v, 50) -> {has_gold_stage.iri}(?p, 3)""",
        f"""{patient.iri}(?p), {fev.iri}(?f), {has_assessment.iri}(?p, ?f), {has_value.iri}(?f, ?v),
            lessThan(?v, 30) -> {has_gold_stage.iri}(?p, 4)"""
    ]

    for rule in rules:
        Imp().set_as_rule(rule)

    patient_one = patient()
    high_fev = fev()
    high_fev.hasValue = 85
    patient_one.hasAssessment = high_fev

    patient_two = patient()
    low_fev = fev()
    low_fev.hasValue = 43
    patient_two.hasAssessment = low_fev