Re: [protege-user] Some doubts

Ximo, I put together a small ontology that models what I think you are
trying to do. I modeled all the vowels and the consonants up to the letter
G. I have two disjoint classes: Vowel and Consonant (note the convention is
you use single tense) and I made those disjoint sets. Actually, I think Y
and even possibly W can be considered a vowel sometimes but I'm making the
simplifying assumption that the only vowels are A, E, I, O, and U so that
vowels and consonants can be disjoint. If you want to model that Y can be
both a vowel or a consonant depending on the context (which I think is more
accurate) then the classes Consonant and Vowel should not be disjoint. Hope
this is useful. Let us know if you have questions.

Michael
https://www.michaeldebellis.com/blog

On Wed, Nov 12, 2025 at 3:10 AM Joaquín José Castelló Benavent via
protege-user <[email protected]> wrote:

> I am trying to build an ontology with a class, "Letters," containing two
> subclasses: "Vowels" and "Consonants." I create the enumerated class
> "Vowels" as in exercise 24 of the manual dated October 8, 2021, by adding
> the instances A, E, I, O, U and then accessing "Equivalent to".
>
> Next, I try to do the same with the "Consonants" class, but when I go to
> add the instances, the vowels I added earlier appear. If I remove them and
> add the consonants (B, C, D, ..., X, Y, Z) and finish the process with
> "Equivalent to," the vowels disappear when I synchronize, and I can't get
> both classes at the same time.
>
> What am I doing wrong?
>
> And another question: How could I use Protege to model the basic questions
> of set theory?
>
> Thank you very much in advance, and please excuse any inconvenience this
> may have caused.
>
> Yours sincerely
> Ximo Castelló.
>
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