verify_schema.py

from rdflib import Graph, Namespace

def verify_ontology_schema(ontology_file):
    print(f"Loading {ontology_file}...")
    g = Graph()
    g.parse(ontology_file, format="turtle")
    print(f"Loaded {len(g)} triples.")

    EX = Namespace("http://example.org/course-ontology#")
    
    # Expected Predicates
    expected_predicates = {
        "hasCourse": EX.hasCourse,
        "relatedTo": EX.relatedTo,
        "hasCourseGrade": EX.hasCourseGrade,
        "prerequisite": EX.prerequisite
    }
    
    print("\nVerifying Key Predicates:")
    all_present = True
    for name, uri in expected_predicates.items():
        # Check if predicate exists in any triple
        if (None, uri, None) in g:
            count = len(list(g.triples((None, uri, None))))
            print(f"[OK] {name} ({uri}) found in {count} triples.")
        else:
            print(f"[FAIL] {name} ({uri}) NOT found.")
            all_present = False
            
    if all_present:
        print("\nSUCCESS: All key predicates verified.")
    else:
        print("\nWARNING: Some predicates are missing. Check build_ontology.py or the ttl file.")

if __name__ == "__main__":
    verify_ontology_schema("course_ontology.ttl")