Clarify homepage vs url #7
Description
A collection may have a homepage URL different from the URL where its data is published. By now this is all "homepage" and for data published via Zenodo its the DOI. Better have two URLs:
- Publication URI (required), e.g. https://doi.org/10.5281/zenodo.13859950
- Homepage (optional), e.g. https://berlinerkunstkammer.de/