This is a simple SWI-Prolog environment setup.

Installations

Open Terminal
Install SWI-Prolog

$ arch -arm64 brew install swi-prolog        
$ swipl --version

File Preparation

Make a new folder
Inside the folder save the Ontology file in .owl format (ex. your_ontology.owl)
inside the folder where the .owl is located, create a new .pl file. (ex. load_ontology.pl)

% Setup
:- use_module(library(semweb/rdf11)).
:- rdf_load('skos.owl').
:- rdf_register_prefix(owl, 'http://www.w3.org/2002/07/owl#').
:- rdf_register_prefix(rdfs, 'http://www.w3.org/2000/01/rdf-schema#').
:- rdf_register_prefix(skos, 'http://www.w3.org/2004/02/skos/core#').
:- rdf_register_prefix(foaf, 'http://xmlns.com/foaf/0.1/').

% List all classes
list_classes :-
    rdf(Class, rdf:type, skos:'Concept'),
    writeln(Class),
    fail.
list_classes :-
    rdf(Class, rdf:type, skos:'ConceptScheme'),
    writeln(Class),
    fail.
list_classes :-
    rdf(Class, rdf:type, foaf:'Person'),
    writeln(Class),
    fail.
list_classes.

% Find all subclasses
subclasses(Class) :-
    rdf(Sub, rdfs:subClassOf, Class),
    writeln(Sub),
    fail.
subclasses(_).

% Find all instances
instances_of(Class) :-
    rdf(Instance, rdf:type, Class),
    writeln(Instance),
    fail.
instances_of(_).

% List all properties
list_properties :-
    rdf(Property, rdf:type, rdf:'Property'),
    writeln(Property),
    fail.
list_properties :-
    rdf(Property, rdf:type, owl:'ObjectProperty'),
    writeln(Property),
    fail.
list_properties :-
    rdf(Property, rdf:type, owl:'DatatypeProperty'),
    writeln(Property),
    fail.
list_properties.

% Find all values of a property for a specific instance
property_values(Instance, Property) :-
    findall(Value, rdf(Instance, Property, Value), Values),
    print_property_values(Values).

print_property_values([]).
print_property_values([Value|Rest]) :-
    format('~w~n', [Value]),
    print_property_values(Rest).

% Example usage
:- initialization(main).

main :-
    writeln('Ontology loaded successfully.'),
    writeln('Classes in the ontology:'),
    list_classes,
    writeln('Subclasses of owl:Thing:'),
    subclasses('http://www.w3.org/2002/07/owl#Thing'),
    writeln('Instances of foaf:Person:'),
    instances_of('http://xmlns.com/foaf/0.1/Person'),
    writeln('Properties in the ontology:'),
    list_properties,
    writeln('Property values for example:Person1 and example:hasName:'),
    property_values('http://www.example.org#Person1', 'http://www.example.org#hasName').

In this part of the code, use your own .owl file (ex. your_ontology.owl)

% Load the OWL file from the local file
:- rdf_load('skos.owl').

Executions

Open Terminal
cd ./your/ontology.owl/path
Run swipl your_swish.pl (ex. swipl load_ontology.pl)
The GUI will be shown like below

user@macbook ai % swipl load_ontology.pl

% Parsed "skos.owl" in 0.03 sec; 192 triples
Ontology loaded successfully.
Classes in the ontology:
http://www.w3.org/2004/02/skos/core#Concepthttp://www.w3.org/2004/02/skos/core#ConceptSchemehttp://xmlns.com/foaf/0.1/Person
Subclasses of owl:Thing:
Instances of owl:Person:
Properties in the ontology:
Property values for owl:Person1 and owl:hasName:
Welcome to SWI-Prolog (threaded, 64 bits, version 9.2.5)
SWI-Prolog comes with ABSOLUTELY NO WARRANTY. This is free software.
Please run ?- license. for legal details.

For online help and background, visit [https://www.swi-prolog.org](https://www.swi-prolog.org/)
For built-in help, use ?- help(Topic). or ?- apropos(Word).

?-

Your SWI-Prolog is ready to use 👍

Feel free to try!