Requirements for every entity

[ptsefton]

Is the @type property required?

Discussed in https://github.com/ResearchObject/ro-crate/discussions/224

^{Originally posted by **Code42Cate** November 27, 2022} Hey everyone, I've been reading the RO-Crate 1.1 specification and was wondering if the `@type` property is required on every entity? I can not find anything clearly stating this, I also looked into the JSON-LD standard. No examples in the specification have an entity without `@type`, but I found some entities in ROHub crates that do not have them. Thank you for your help :) Cheers, Jonas

[stain]

I would suggest we modify this for RO-Crate 1.2 to be explicit, so that every entity MUST have at least @type and SHOULD have name. If no appropriate type is available, you can use Thing (anything) or WebPage (if you're pointing to a page) or DefinedTerm (if it's a semantic concept defined elsewhere)

[simleo]

ro-crate-py already requires entities to have a @type

[stain]

Need a new generic Requirements for every entity section right after data/context entity, perhaps this can also suggest that any other schema.org properties and types can be used. Or does this fit into the JSON-LD appendix?

Current Table of contents for 1.2-DRAFT:

• Introduction
• Terminology
• RO-Crate Structure
• Metadata of the RO-Crate
• Root Data Entity
• Data Entities
• Contextual Entities
• The focus of an RO-Crate
• Profiles
• Provenance of entities
• Workflows and scripts
• Appendix
  • Changelog
  • Handling relative URI references
  • Implementation notes
  • RO-Crate JSON-LD

[stain]

260 is adding it to the "Metadata of the RO-Crate" section