What Is The Full Form Of WSDL?
The full form of WSDL is Web Services Description Language.
WSDL is an XML-based file that describes a web service to the client application, developed jointly by IBM and Microsoft. A WSDL file gives all the necessary information to the client that they might require to connect to the web service- so that they can use all the functionalities that the web service provides. The WSDL document specifies the methods and location of the service using a few elements like <types>, <messages>, and more.
History Of Web Services Description Language (WSDL)
- Microsoft, IBM, and Ariba jointly developed and released the WSDL 1.0 in September 2000 by blending two service description languages- (SDL) Service Description Language from Microsoft and Network Application Service Specification Language (NASSL) from IBM.
- WSDL 1.0 was formalized and published as WSDL 1.1 in the market in 2001, March. There were no distinct changes between 1.1 and 1.0.
- The WSDL was a working draft in June 2003 at W3C. It was flexible and easier than the previous versions for developers.
- WSDL 1.2 renamed and evolved into WSDL 2.0 with substantial differences from 1.1.
- The WSDL 2.0 was a W3C (World Wide Web Consortium) recommendation in June 2007.
Characteristics Of WSDL
- WDSL specifies the operations that a web service performs and how to access them.
- It is an XML-based protocol used for information exchange in distributed and decentralized systems.
- WSDL is independent of platforms.
- It is a language that describes the specifications needed to interface with the XML-oriented services.
- WDSL forms an indispensable part of UDDI (Universal Description, Discovery, and Integration).
- It can set a defined endpoint in the web service along with output, input, and fault messages.
- WSDL can also be used for node configuration in the SOAP domain.
A WSDL document describes a particular web service. Here are the elements that it uses to specify the methods and location of service:
<types> – It defines the data types (XML Schema) that are used by the web service.
<messages> – This element defines all the data elements for each operation.
<binding> – It describes the data format and protocol for each type of port.
<portType> – This element describes all the operations that one can perform and the involved messages.
Benefits Of WSDL
- WSDL follows a systematic approach for defining web services.
- A user can update WSDL dynamically so that they can upgrade to new patterns without any hitch.
- WSDL reduces the total LOC- which is a prerequisite to access the web services.
- The WSDL file is written in plain old XML- so its files are easily readable by all programming languages.
Limitations Of WSDL
- One-way messaging (Single-mode) is not allowed in WSDL. It requires both output and input.
- It does not allow overload operations.
- Every operation needs to be of one kind, i.e., all doc/literal or RPC-encoded.
- It does not support SOAP-encoded structures and SOAP-encoded arrays.
- There is no support for output mapping (header in response).
- It only considers SOAP operations and ignores HTTP and MIME operations.
- WSDL can’t include more than one element of <wsdl:include> (cannot have more than one file).
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