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It categorizes a Web API into four levels (from 0 to 3) with each higher level corresponding to a more complete adherence to REST design. The next level also contains all the characteristics of the previous one. [4] [5] Other classification systems for Web API services design also exist, such as CoHA and WS 3. [3]
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]
WADL was submitted to the World Wide Web Consortium by Sun Microsystems on 31 August 2009 [1], but the consortium has no current plans to standardize it [2]. WADL is the REST equivalent of SOAP's Web Services Description Languages (WSDL), which can also be used to describe REST web services. [3]
In January 2011 the JCP formed the JSR 339 expert group to work on JAX-RS 2.0. The main targets are (among others) a common client API and support for Hypermedia following the HATEOAS-principle of REST. In May 2013, it reached the Final Release stage. [3] On 2017-08-22 JAX-RS 2.1 [4] specification final release
Restful Objects is a standard covering RESTful interfaces to domain object models. The specification is published under a Creative Commons license . Representations and resources defined by the standard
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 ...
It provides all the information necessary to describe APIs on the level 2 of the Richardson Maturity Model. Although designed with RESTful APIs in mind, RAML is not capable of describing APIs that obey all constraints of REST (it cannot describe an API obeying HATEOAS, in particular). It encourages reuse, enables discovery and pattern-sharing ...
The client can then use SOAP to actually call one of the operations listed in the WSDL file, using for example XML over HTTP. The current version of the specification is 2.0; version 1.1 has not been endorsed by the W3C but version 2.0 is a W3C recommendation. [1] WSDL 1.2 was renamed WSDL 2.0 because of its substantial differences from WSDL 1.1.