It is so confusing, can someone help me demystify? Does MuleSoft support OpenAPI 3.x.x specification as of today? Also what is this RAML 1.0 specification? Do we really care about RAML specs when dealing with MuleSoft?
The OpenAPI Specification (OAS), originally known as the Swagger Specification, is a specification for machine-readable interface files for describing, producing, consuming, and visualizing RESTful web services.
RAML, API Blueprint are same kind of IDL for REST API.
MuleSoft have a product called Anypoint Platform API designer that can help design only RAML API specifications, so it does NOT support OAS 3.0.0.
However, the product support the OAS 2.0. You can import an OAS ZIP or JSON file from your file system or from a URL. The importation converts the OAS to RAML. Basically, it is OAS to RAML converter.