Add field for exemplar classes

[cmungall]

Add a field to the metadata schema to allow groups to provide a list of exemplar classes. This would serve various purposes:

• informative for users to get a sense of the kind of thing an ontology can contain.
• foundry reviews could include a review of these (in addition to other methods of sampling across the ontology)
• The OBO page for an ontology could provide direct links into these class URIs
• Portals like OLS could make use of these in various ways, to provide users with informative entry points @simonjupp

I think we could make something like a minimum of 5 exemplars required for review (attn EWG)

[jamesaoverton]

I think it's a good idea. There are some sources we could draw from to pre-populate this.

The PURL configs have an example_terms field. My intention was for it to have a few of the most important terms for testing, but I wouldn't say that's how it's actually used. Still, it might be useful to draw from there to populate this.

Ontobee also shows some of the most important terms -- the list is better for some ontologies than others. Oliver sent me those lists and I put them in the "Ontobee Top Level Terms" sheet here: https://docs.google.com/spreadsheets/d/1DHU6EktJKuOShV_vK-gKLK6b5RwXG021kAfpqWkcKIU

[bpeters42]

This reminds me of the keywords field for publications for which I never saw much value. Authors (and I suspect ontology developers) are not always that great in defining 'most important terms'. Not opposed to this, but it does not strike me as something of high priority given everything else that is going on.

[nlharris]

Is this still needed?

[cthoyt]

Bioregistry also keeps track of these now too

[matentzn]

Still think its a good idea but some ontologies don't coin terms, like OMO, or some project ontologies..

I just think this is low priority, nice to have.