Gotcha, that's part of Fusion Middleware. I'm not familiar with it, but from the preface:
This document is intended for curators, consumers, and administrators of APIs in Oracle API Manager, developers who create proxy services in Oracle Service Bus, and anyone interested in learning about the product.It sounds like it's for managing RESTful services in general.
If you're looking to make database REST API, ORDS fits the job:
http://www.oracle.com/technetwork/developer-tools/rest-data-services/overview/index.html