Description of XML Schema-WSD

Web Services Description Language (Web Services Description Language, WSDL) provides a simple way to describe Web services (mostly using SOAP). WSDL allows you to describe services and interfaces provided using the SOAP standard. For example, you can create a WSDL file that describes the services provided on a certain server, and then distribute the file to servers that need these services. Web Services Description Language (WSDL) provides a way to describe Web services. Simple method (mostly using SOAP). WSDL allows you to describe services and interfaces provided by the SOAP standard.
For example, you can create a WSDL file that describes the services provided on a certain server, and then distribute the file to Web service consumers who need these services. By reading and parsing the WSDL file, consumers learn everything they need to know to use these Web services, including the
data types that can be exchanged, the parameters, and the various errors and other information returned. Using the example from
W3C again, you can see that the declaration of the different remote functions and the data exchanged are all handled through the XML definition of the structure, As shown in Listing 3.
Listing 3. XML definitions of different remote functions and exchanged data
         

 









  

  



    

    



      

      

  

    

      

            

    

  

      



      

      

  

    

      

    

  

      



      

      

  

    

      

    

  

      



    

  



  



  

  

    

  



  

  

    

  



  

  



    

    

      

      

      

    

  



  

  



    

    



    

    



      

      



      

      

        

      

      

        

      

      

        

      

    

  



  

  

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Everything you need to access the SOAP structure on the server can be found in this WSDL. Most languages ​​and environments provide a mechanism for reading and parsing WSDL to determine available functions and data exchanges.
WSDL not only defines the SOAP interface for exchanging information, but with the appropriate WSDL generator, can also be used to create the code needed to send requests and generate and format responses.
WSDL and SOAP form a powerful remote procedure call system.                                                                                              

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