Dear Sir,
I thank you for your answer. The reference explains how such a situation is in part accurate. However, this is not the only situation where the use of instance of and subclass of is problematic. Please refer to https://dl.acm.org/citation.cfm?id=2891117 for such matters.
Yours Sincerely,
Houcemeddine Turki (he/him)
Medical Student, Faculty of Medicine of Sfax, University of Sfax, Tunisia
Undergraduate Researcher, UR12SP36
GLAM and Education Coordinator, Wikimedia TN User Group
Member, WikiResearch Tunisia
Member, Wiki Project Med
Member, WikiIndaba Steering Committee
Member, Wikimedia and Library User Group Steering Committee
Co-Founder, WikiLingua Maghreb
Founder, TunSci
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-------- Message d'origine --------
De : Egon Willighagen <egon.willighagen@gmail.com>
Date : 2019/08/21 20:02 (GMT+01:00)
À : Discussion list for the Wikidata project <wikidata@lists.wikimedia.org>
Objet : Re: [Wikidata] Important, Critical issues related to Wikidata

On Wed, Aug 21, 2019 at 8:44 PM Houcemeddine A. Turki
<turkiabdelwaheb@hotmail.fr> wrote:
>
> I thank you for your efforts. It was an honour for me to meet you in Stockholm. Concerning the points you raised, I
> 1. Concerning the problematic use of Instance of and SubClass of, I invite you to see https://tinyurl.com/y29lx9o4. This seems to be not accurate as drugs differ from drug classes from a pharmacological view. For example, Artemisinin, Ibuprofen and Sobosbuvir are drugs. However, drug classes should include antibiotics and antivirals. Concerning WikiProject Ontology, I know it. The project succeeded to solve many matters related to the structure of Wikidata. However, the project is slow.

To me this is actually a nice example of *why* we need to distinction.

Sobosbuvir as in instance is often the active ingredient.
Sobosbuvir as a class is often the formulation, which is not a single
entity, but a class of formulations with different amounts (and
concentrations) of active ingredient

It's just that in street/common language (not wrong, just different!)
we don't use different words for it. Instance-vs-subclass are tools
that help us make this distinction.

Now, related to this, plz have a look at
https://www.wikidata.org/wiki/Wikidata:WikiProject_Chemistry where
class and instance are both used, for good reasons.

Egon

--
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-----
E.L. Willighagen
Department of Bioinformatics - BiGCaT
Maastricht University (http://www.bigcat.unimaas.nl/)
Homepage: http://egonw.github.com/
Blog: http://chem-bla-ics.blogspot.com/
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ORCID: 0000-0001-7542-0286
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