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There are two previous major description languages: WSDL 2.0 (Web Services Description Language) and WADL (Web Application Description Language). Neither is widely adopted in the industry for describing RESTful APIs, citing poor human readability of both and WADL being actually unable to fully describe a RESTful API. [2]
The RESTful Service Description Language (RSDL) is a machine- and human-readable XML description of HTTP-based web applications (typically REST web services). [1]The language (defined by Michael Pasternak during his work on oVirt RESTful API) allows documenting the model of the resource(s) provided by a service, the relationships between them, and operations and the parameters that must be ...
The Web Application Description Language (WADL) is a machine-readable XML description of HTTP-based web services. [1] WADL models the resources provided by a service and the relationships between them. [ 1 ]
RESTful API Modeling Language (RAML) is a YAML-based language for describing static APIs (but not REST APIs). [2] It provides all the information necessary to describe APIs on the level 2 of the Richardson Maturity Model .
The aim of the research of the model as stated by the author was to find out the relationship between the constraints of REST and other forms of web services. [ 1 ] It divides the principal parts of RESTful design into three steps: resource identification ( URI ), HTTP verbs, and hypermedia controls (e.g. hyperlinks ).
REST (Representational State Transfer) is a software architectural style that was created to guide the design and development of the architecture for the World Wide Web. REST defines a set of constraints for how the architecture of a distributed, Internet-scale hypermedia system, such as the Web, should behave.
Two somewhat similar technologies, MuleSoft's RESTful API Modeling Language (RAML) and Apiary's API Blueprint, had been developed around the same time as what was then still called the Swagger Specification. The producers of both formats later joined the OpenAPI Initiative: Apiary in 2016 [15] and MuleSoft in 2017. [16]
An example of a popular web API is the Astronomy Picture of the Day API operated by the American space agency NASA. It is a server-side API used to retrieve photographs of space or other images of interest to astronomers, and metadata about the images. According to the API documentation, [15] the API has one endpoint: