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A client program connecting to a Web service can read the WSDL file to determine what operations are available on the server. Any special datatypes used are embedded in the WSDL file in the form of XML Schema. 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 technique is also referred to as contract first since the WSDL (or contract between sender and receiver) is the starting point. [6] A developer using a Subset WSDL (SWSDL) [7] (i.e. a WSDL with the subset operation in the original WSDL) can perform Web service testing and top-down development.
The description format has the same purpose for JSON-WSP as WSDL has for SOAP or IDL for CORBA, which is to describe the types and methods used in a given service. It also describes inter-type relations (i.e. nested types) and defines which types are expected as method arguments and which types the user can expect to receive as method return ...
These specifications are in varying degrees of maturity and are maintained or supported by various standards bodies and entities. These specifications are the basic web services framework established by first-generation standards represented by WSDL, SOAP, and UDDI. [1] Specifications may complement, overlap, and compete with each other.
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]
The WSDL interface format is typically used for this purpose. (Service) Discovery Protocol : centralizes services into a common registry so that network Web services can publish their location and description, and makes it easy to discover what services are available on the network.
The term "endpoint interface" is more specific about "how to implement the endpoint", for example by an OpenAPI specification or by WSDL specification. Typical endpoints can be expressed by URI Templates. In Open API terms the endpoints are resources that the API exposes. The old (2004) term "end point" received also a glossary definition: [2]
The JAX-WS 2.2 specification JSR 224 defines a standard Java- to-WSDL mapping which determines how WSDL operations are bound to Java methods when a SOAP message invokes a WSDL operation. This Java-to-WSDL mapping determines which Java method gets invoked and how that SOAP message is mapped to the method’s parameters.