The following schemas have no "requiredProperties" listed:
alternate_identifier_info_schema.json
annotation_schema.json
category_values_pair_schema.json
data_type_schema.json
identifier_info_schema.josn
person_schema.json
place_schema.json
provenance_schema.json
publication_schema.json
related_identifier_info_schema.json
For some of these schemas, that may be right approach but concepts like person, place and publication should probably require at least a name, title or other primary identifier.
The following schemas have no "requiredProperties" listed:
For some of these schemas, that may be right approach but concepts like person, place and publication should probably require at least a name, title or other primary identifier.