In no particular order:
- Entity reference field values need to be (somehow):
- (Outgoing) Expressed as the title/URL on our site.
- (Incoming) Filled by finding a content item with a sameAs property that matches the URL of the field. (By definition, there should only be one. Wikipedia pages are always a good bet; would be lovely to have some sort of Wikipedia/Wikidata integration.
- (Incoming) If we can't find a match, create a new item from the title.