standardize on creation date property

[cmungall]

These sneaked in:

property_value: http://purl.org/dc/elements/1.1/date 2020-09-08T15:05:03Z xsd:dateTime

this is not in the allowed list of properties so this is blocking release

• fix these to be creation_date OE style for now
• document the standard way of doing this and setting up Protege for uberon @nicolevasilevsky - align this with GO, Mondo, etc
• getting the allowed property checks into travis. Preferably not the existing perl. We need shex for OBO any ideas @balhoff @matentzn

We should do the same for creator... and do this more generally for other ontologies

[matentzn]

Would you be fine with a "allowed properties" sparql check instead? quick and easy to set up - else it will have to wait a bit before I can work on it. If the answer is "yes", do you want such a check in Mondo as well?

[nicolevasilevsky]

I added documentation to the Uberon wiki:
https://github.com/obophenotype/uberon/wiki/Editors-guide