In computer science, declarative programming is a programming paradigm (a style of building the structure and elements of computer programs), that expresses the logic of a computation without describing its control flow - wikipedia 
A RESTful web service, is a Web Service that conforms to Representational State Transfer (REST) practices.
Last night Jon and Ward fiddled with Steampipe site which is an open source API browsing tool that fits into the same niche as Ward's own El Dorado.