.NET/ASP.NET Interview Question - What is WSDL?

WSDL(Web Services Description Language) is an XML-based language which describes the Web services,Method name,Function name and Input Output parameter.

To see how WSDL look like, just go to Visual Studio create a webservice and run .asmx file you will see the output like below diagram and when you click on service description then the WSDL will be seen.

 <?xml version="1.0" encoding="utf-8" ?> 
- <wsdl:definitions 

xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" 

xmlns:tm="http://microsoft.com/wsdl/mime/textMatching/" 

xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/" 

xmlns:mime="http://schemas.xmlsoap.org/wsdl/mime/" 

xmlns:tns="http://tempuri.org/" xmlns:s="http://www.w3.org/2001/XMLSchema" 

xmlns:soap12="http://schemas.xmlsoap.org/wsdl/soap12/" 

xmlns:http="http://schemas.xmlsoap.org/wsdl/http/" 

targetNamespace="http://tempuri.org/" 

xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/">
- <wsdl:types>
- <s:schema elementFormDefault="qualified" targetNamespace="http://tempuri.org/">
- <s:element name="HelloWorld">
  <s:complexType />   

</s:element>
- <s:element name="HelloWorldResponse">
- <s:complexType>
- <s:sequence>
  <s:element minOccurs="0" maxOccurs="1" name="HelloWorldResult" type="s:string" /> 


  </s:sequence>
  </s:complexType>  

</s:element>
  </s:schema>  

</wsdl:types>
+ <wsdl:message name="HelloWorldSoapIn">  

<wsdl:part name="parameters" element="tns:HelloWorld" />   

</wsdl:message>
- <wsdl:message 

name="HelloWorldSoapOut">
  <wsdl:part name="parameters" 

element="tns:HelloWorldResponse" /> 
  </wsdl:message>

<wsdl:portType name="WebService1Soap">
- <wsdl:operation 

name="HelloWorld">
  <wsdl:input message="tns:HelloWorldSoapIn"/> 
  <wsdl:output message="tns:HelloWorldSoapOut" /> 


  </wsdl:operation>
  </wsdl:portType>

Regards,