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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]
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]
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]
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
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 ...
A Web API is a development in Web services where emphasis has been moving to simpler representational state transfer (REST) based communications. [2] Restful APIs do not require XML-based Web service protocols (SOAP and WSDL) to support their interfaces.
The separation of the API from its implementation can allow programs written in one language to use a library written in another. For example, because Scala and Java compile to compatible bytecode, Scala developers can take advantage of any Java API. [19] API use can vary depending on the type of programming language involved.
As of Java SE 11, JAX-WS was removed. For details, see JEP 320. JAX-WS 2.0 replaced the JAX-RPC API in Java Platform, Enterprise Edition 5 which leans more towards document style Web Services. This API provides the core of Eclipse Metro. JAX-WS also is one of the foundations of WSIT.