I am building a web site for knowledge discovery, and would like to understand more the structure of wikidata in order to expose selected keys for a wikidata object.

Is there any schema describing all the keys used in wikidata objects?

As example, this demo shows all possible keys for 'Richard_Feynman' object.


It looks like that for each property belonging to 'Richard_Feynman' a query must be made against the property_Id , so to fetch a human readable label.
That is, about ~500Kb must be downloaded. I would like to understand better how to consume wikidata API.

thank you for your debrief,