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Encyclopedia > Web services description language
"WSDL" redirects here. For other uses, see WSDL (disambiguation).
Web Services Description Language
File extension: .wsdl
MIME type: application/wsdl+xml
Developed by: World Wide Web Consortium
Contained by: XML
Standard(s): 2.0 Recommendation


The Web Services Description Language (WSDL, pronounced 'wiz-dəl' or spelled out, 'W-S-D-L') is an XML-based language that provides a model for describing Web services. WSDL could refer to: WSDL, a National Public Radio affiliate station broadcasting on 90. ... A filename extension is a suffix to the name of a computer file applied to show its format. ... Look up mime in Wiktionary, the free dictionary. ... The Extensible Markup Language (XML) is a general-purpose markup language. ... Standards are produced by many organizations, some for internal usage only, others for use by a groups of people, groups of companies, or a subsection of an industry. ... The Extensible Markup Language (XML) is a general-purpose markup language. ... The W3C defines a Web service (many sources also capitalize the second word, as in Web Services) as a software system designed to support interoperable Machine to Machine interaction over a network. ...


The current version of the specification is the 2.0: version 1.1 has not been endorsed by the W3C while the last, for which several drafts have been released, is a W3C recommendation. [1] WSDL 1.2 was renamed WSDL 2.0 because of its substantial differences from WSDL 1.1. By accepting binding to all the HTTP request methods (not only GET and POST as in version 1.1) WSDL 2.0 specification offers a better support for RESTful web services, much simpler to implement by beginners[2][3]. However support for this specification is still poor in software development kits for Web Services which often offer tools only for WSDL 1.1. It has been suggested that W3C Markup Validation Service be merged into this article or section. ... A W3C Recommendation is the final stage of a ratification process of the W3C working group concerning the standard. ... Hypertext Transfer Protocol (HTTP) is a communications protocol used to transfer or convey information on the World Wide Web. ... “REST” redirects here. ... The W3C defines a Web service (many sources also capitalize the second word, as in Web Services) as a software system designed to support interoperable Machine to Machine interaction over a network. ... A software development kit (SDK or devkit) is typically a set of development tools that allows a software engineer to create applications for a certain software package, software framework, hardware platform, computer system, video game console, operating system, or similar. ...


The WSDL defines services as collections of network endpoints, or ports. WSDL specification provides an XML format for documents for this purpose. The abstract definition of ports and messages is separated from their concrete use or instance, allowing the reuse of these definitions. A port is defined by associating a network address with a reusable binding, and a collection of ports define a service. Messages are abstract descriptions of the data being exchanged, and port types are abstract collections of supported operations. The concrete protocol and data format specifications for a particular port type constitutes a reusable binding, where the messages and operations are then bound to a concrete network protocol and message format. In this way, WSDL describes the public interface to the web service. The Extensible Markup Language (XML) is a general-purpose markup language. ... Look up format in Wiktionary, the free dictionary. ...


WSDL is often used in combination with SOAP and XML Schema to provide web services over the Internet. A client program connecting to a web service can read the WSDL to determine what functions 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 functions listed in the WSDL. A collection of decorative soaps used for human hygiene purposes. ... An XML schema is a description of a type of XML document, typically expressed in terms of constraints on the structure and content of documents of that type, above and beyond the basic syntax constraints imposed by XML itself. ... On computer science, a datatype (often simply type) is a name or label for a set of values and some operations which can be performed on that set of values. ...


XLang is an extension of the WSDL such that "an XLANG service description is a WSDL service description with an extension element that describes the behavior of the service as a part of a business process" [1].


Resources or services are exposed using WSDL by both Web Services Interoperability (WS-I Basic Profile) and WSRF framework. The Web Services Interoperability Organization (WS-I) is an industry consortium chartered to promote interoperability amongst the stack of web services specifications. ... The WS-I Basic Profile (official abbreviation is BP), a specification from the Web Services Interoperability industry consortium (WS-I), provides interoperability guidance for core Web Services specifications such as SOAP, WSDL, and UDDI. The profile uses Web Services Description Language (WSDL) to enable the description of services as sets... This article needs to be cleaned up to conform to a higher standard of quality. ...

Contents

Example WSDL

Here is an example of a structured WSDL 2.0 document:

 <?xml version="1.0" encoding="UTF-8"?> <description xmlns="http://www.w3.org/ns/wsdl" xmlns:tns="http://www.example.com/wsdl20sample" xmlns:whttp="http://www.w3.org/ns/wsdl/http" xmlns:wsoap="http://www.w3.org/ns/wsdl/soap" targetNamespace="http://www.example.com/wsdl20sample"> hgfhg <!-- Abstract types --> <types> <xs:schema xmlns="http://www.example.com/wsdl20sample" xmlns:xs="http://www.w3.org/2001/XMLSchema" targetNamespace="http://www.example.com/wsdl20sample"> <xs:element name="request"> <xs:complexType> <xs:sequence> <xs:element name="header" maxOccurs="unbounded"> <xs:complexType> <xs:simpleContent> <xs:extension base="xs:string"> <xs:attribute name="name" type="xs:string" use="required"/> </xs:extension> </xs:simpleContent> </xs:complexType> </xs:element> <xs:element name="body" type="xs:anyType" minOccurs="0"/> </xs:sequence> <xs:attribute name="method" type="xs:string" use="required"/> <xs:attribute name="uri" type="xs:anyURI" use="required"/> </xs:complexType> </xs:element> <xs:element name="response"> <xs:complexType> <xs:sequence> <xs:element name="header" maxOccurs="unbounded"> <xs:complexType> <xs:simpleContent> <xs:extension base="xs:string"> <xs:attribute name="name" type="xs:string" use="required"/> </xs:extension> </xs:simpleContent> </xs:complexType> </xs:element> <xs:element name="body" type="xs:anyType" minOccurs="0"/> </xs:sequence> <xs:attribute name="status-code" type="xs:anySimpleType" use="required"/> <xs:attribute name="response-phrase" use="required"/> </xs:complexType> </xs:element> </xs:schema> </types> <!-- Abstract interfaces --> <interface name="RESTfulInterface"> <fault name="ClientError" element="tns:response"/> <fault name="ServerError" element="tns:response"/> <fault name="Redirection" element="tns:response"/> <operation name="Get" pattern="http://www.w3.org/ns/wsdl/in-out"> <input messageLabel="GetMsg" element="tns:request"/> <output messageLabel="SuccessfulMsg" element="tns:response"/> </operation> <operation name="Post" pattern="http://www.w3.org/ns/wsdl/in-out"> <input messageLabel="PostMsg" element="tns:request"/> <output messageLabel="SuccessfulMsg" element="tns:response"/> </operation> <operation name="Put" pattern="http://www.w3.org/ns/wsdl/in-out"> <input messageLabel="PutMsg" element="tns:request"/> <output messageLabel="SuccessfulMsg" element="tns:response"/> </operation> <operation name="Delete" pattern="http://www.w3.org/ns/wsdl/in-out"> <input messageLabel="DeleteMsg" element="tns:request"/> <output messageLabel="SuccessfulMsg" element="tns:response"/> </operation> </interface> <!-- Concrete Binding Over HTTP --> <binding name="RESTfulInterfaceHttpBinding" interface="tns:RESTfulInterface" type="http://www.w3.org/ns/wsdl/http"> <operation ref="tns:Get" whttp:method="GET"/> <operation ref="tns:Post" whttp:method="POST" whttp:inputSerialization="application/x-www-form-urlencoded"/> <operation ref="tns:Put" whttp:method="PUT" whttp:inputSerialization="application/x-www-form-urlencoded"/> <operation ref="tns:Delete" whttp:method="DELETE"/> </binding> <!-- Concrete Binding with SOAP--> <binding name="RESTfulInterfaceSoapBinding" interface="tns:RESTfulInterface" type="http://www.w3.org/ns/wsdl/soap" wsoap:protocol="http://www.w3.org/2003/05/soap/bindings/HTTP/" wsoap:mepDefault="http://www.w3.org/2003/05/soap/mep/request-response"> <operation ref="tns:Get" /> <operation ref="tns:Post" /> <operation ref="tns:Put" /> <operation ref="tns:Delete" /> </binding> <!-- Web Service offering endpoints for both the bindings--> <service name="RESTfulService" interface="tns:RESTfulInterface"> <endpoint name="RESTfulServiceRestEndpoint" binding="tns:RESTfulInterfaceHttpBinding" address="http://www.example.com/rest/"/> <endpoint name="RESTfulServiceSoapEndpoint" binding="tns:RESTfulInterfaceSoapBinding" address="http://www.example.com/soap/"/> </service> </description>

Example of WSDL Usage in Adobe Flex

The mx:WebService XML element, as shown below in an extract from a Flex application program, references the WSDL by its Internet URL. The WSDL defines all the operations that the web service offers. One of the operations is "Logon". The Logon operation takes three string arguments (userid, password, language code), as stated in the WSDL, which are sourced via the data binding operator (curly brackets) from text boxes elsewhere in the form (not shown). Flex references the web service with the help of the WSDL document. Any reply from the web service is returned to a DataGrid component as {BBAuthenticate.Logon.lastResult}, which references the web service, the operation, and the most recent data received.

 <mx:WebService id="BBAuthenticate" wsdl="http://10.1.1.1/auth.wsdl" useProxy="false" showBusyCursor="true" makeObjectsBindable="true"> <mx:operation name="Logon"> <mx:request> <userName>{yourUserName.text}</userName> <password>{yourPassword.text}</password> <language>{yourLanguage.text}</language> </mx:request> </mx:operation> </mx:WebService> <mx:DataGrid rowCount="2" allowMultipleSelection="true" x="10" y="380" id="authResponse" width="560" dataProvider="{BBAuthenticate.Logon.lastResult}" height="45">

References

  1. ^ Web Services Description Language (WSDL) Version 2.0 Part 1: Core Language.
  2. ^ Web Services Description Language (WSDL) Version 2.0 Part 2: Adjuncts.
  3. ^ WITW WSDL 2.0 HTTP Binding.

External links

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Standards of the World Wide Web Consortium
Recommendations CSS · CGI · DOM · HTML · RDF · SVG · SOAP · SMIL · SRGS · SSML · VoiceXML · WSDL · XACML · XHTML · XML · XML Events · XForms · XML Information Set · XML Schema (W3C) · XPath · XQuery · XSL Transformations · XLink · XML Base · SISR · OWL · MathML · RDF Schema · Timed Text ·
Notes XHTMLplusSMIL
Working Drafts CURIE · CCXML · InkML · XFrames · XFDL  · Web Integration Compound Document  · XHTMLplusMathMLplusSVG

  Results from FactBites:
 
Web Services Description Language - Wikipedia, the free encyclopedia (314 words)
WSDL is an XML-based service description on how to communicate using the web service; namely, the protocol bindings and message formats required to interact with the web services listed in its directory.
WSDL is often used in combination with SOAP and XML Schema to provide web services over the Internet.
XLang is an extension of the WSDL such that "an XLANG service description is a WSDL service description with an extension element that describes the behavior of the service as a part of a business process" [1].
  More results at FactBites »


 

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