XSD / Swagger / Service Descriptors / JSON Schema for HCM integration for Atom Feeds and WSDL

Hi experts,

for integration with legacy systems purpose, a 3rd party integrator is asking to provide:

• descriptor of rest service for Atom Feeds (can be XSD, JSON Schema, Swagger, OpenAPI)
• JSON schema or XSD related to Atom Feed response, especially for <Content> field informations as response of Atom Feeds REST endpoints
• XSD to detail output for WSDL operations responses

Any idea on how to retrieve this kind of details? I've tried to search on Oracle official documentation, but with no luck.

Regards,

Massimiliano