Validation for POSTing data

[sfolsom]

Steps for POSTing a new resource:

1. Validation, return SHACL report, e.g. missing title
2. Deduplication test, return with existing URI if applicable
3. Store data with new URIs
4. POST returns reporting package, e.g. errors, new URIs, system down

[sfolsom]

Steps for PUTing a resource:

1. URIs stay the same
2. PUT changes
3. Validation, return SHACL report, e.g. missing title
4. Deduplication test, return with existing URI if applicable
5. If applicable, no really, I want to make these changes
6. Store data with new URIs
7. Returns reporting package, e.g. errors, the URI/s, system down

(If we decide to implement deprecation the way id.loc.gov does, it will be a PUT with new assertions)

[sfolsom]

Steps for DELETEing a resource:

(TBD, based on deletion policy)