Hi there!

What is WSDL?

please explain with an example...

__________________
cheers
Aman

pls look

http://www.discussweb.com/xml-soap/8...vice-wsdl.html

Thanks
R.Rajan

Hi,

What is WSDL?

* WSDL stands for Web Services Description Language
* WSDL is written in XML
* WSDL is an XML document
* WSDL is used to describe Web services
* WSDL is also used to locate Web services
* WSDL is not yet a W3C standard

WSDL Documents

WSDL is a document written in XML. The document describes a Web service. It specifies the location of the service and the operations (or methods) the service exposes.It contains set of definitions to describe a web service.

The WSDL Document Structure

A WSDL document describes a web service using these major elements:

1.<portType>--The operations performed by the web service
2.<message> ---The messages used by the web service
3.<types> --The data types used by the web service
4.<binding>--The communication protocols used by the web service

The main structure of a WSDL document looks like this:
<definitions>

<types>
definition of types........
</types>

<message>
definition of a message....
</message>

<portType>
definition of a port.......
</portType>

<binding>
definition of a binding....
</binding>

</definitions>

A WSDL document can also contain other elements, like extension elements and a service element that makes it possible to group together the definitions of several web services in one single WSDL document.

WSDL Ports

The <portType> element is the most important WSDL element.

It describes a web service, the operations that can be performed, and the messages that are involved.

The <portType> element can be compared to a function library (or a module, or a class) in a traditional programming language.

WSDL Messages

The <message> element defines the data elements of an operation.

Each message can consist of one or more parts. The parts can be compared to the parameters of a function call in a traditional programming language.

WSDL Types

The <types> element defines the data type that are used by the web service.

For maximum platform neutrality, WSDL uses XML Schema syntax to define data types.

WSDL Bindings

The <binding> element defines the message format and protocol details for each port.

WSDL Example

<message name="getTermRequest">
<part name="term" type="xs:string"/>
</message>

<message name="getTermResponse">
<part name="value" type="xs:string"/>
</message>

<portType name="glossaryTerms">
<operation name="getTerm">
<input message="getTermRequest"/>
<output message="getTermResponse"/>
</operation>
</portType>

ThankQ
KiruthikaSambandam

The Web Services Description Language (WSDL) currently represents the service description layer within the Web service protocol stack.

In a nutshell, WSDL is an XML grammar for specifying a public interface for a Web service.

This public interface can include the following:

Information on all publicly available functions.

Data type information for all XML messages.

Binding information about the specific transport protocol to be used.

Address information for locating the specified service.

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S.VinothkumaR
Behind me is infinite power,
Before me is Endless Possibility,
Around me is Boundless Opportunity,
Why should I fear!

WSDL is not necessarily tied to a specific XML messaging system, but it does include built-in extensions for describing SOAP services.

Below is a sample WSDL file. This file describes the public interface for the weather service used in the SOAP example above. Obviously, there are many details to understanding the example. For now, just consider two points.
First, the <message> elements specify the individual XML messages that are transferred between computers. In this case, we have a getWeatherRequest and a getWeatherResponse. Second, the element specifies that the service is available via SOAP and is available at a specific URL.

__________________
S.VinothkumaR
Behind me is infinite power,
Before me is Endless Possibility,
Around me is Boundless Opportunity,
Why should I fear!

Using WSDL, a client can locate a Web service, and invoke any of the publicly available functions. With WSDL-aware tools, this process can be entirely automated, enabling applications to easily integrate new services with little or no manual code.

For example, check out the GLUE platform from the Mind Electric.

WSDL has been submitted to the W3C, but it currently has no official status within the W3C. See this W3C page for the latest draft.

__________________
S.VinothkumaR
Behind me is infinite power,
Before me is Endless Possibility,
Around me is Boundless Opportunity,
Why should I fear!