Online access is rising day by day today. Connectivity was historically confined only to machines that utilised the same hardware and software technology. But to meet the ever-growing needs, this restricted versatility was inadequate. So there was a need for such a system to allow communication between platforms, or I can say that the communications should be independent of the languages of operating systems and programming. The concept of web services was introduced to tackle this problem.Do you want to learn more? Visit Standout Web Services
A web service has a list of methods and procedures that can be used, regardless of the programming languages, OS, hardware used to develop them, by any of the applications. The functionality provided by the web service can be accessed by any kind of application and such functionality is called web methods or web APIs.
A web service enables XML and HTTP communication via internet standards. I can therefore say that any computer with internet access can have access to the web service. Once a web service is deployed on the Internet, HTTP and XML can be used by any client. There might be a web page that offers any person’s information depending on their social security number. Any consumers who need to use it can readily use this facility.
For a web service, the specific specifications are described as follows.
A common data representation format so that the agnostic platform should be for communication or data exchange.
A basic specification for submitting web service messages and getting web service replies.
A common format for a web service overview.
A standard for publishing and discovering web services enabling applications to access them.
The various requirements described above are based on the open standards such as XML, SOAP, WSDL and UDDI.
Since XML (eXtensionable Markup Language) is considered as cross platform standard for transferring data over Internet because it is understand by any hardware and software. The XML also describes the data.
In order to communicate there must be a common protocol to exchange the information. SOAP (Simple Object Access Protocol) is Microsoft implementation, responsible for transporting messages between network applications and includes protocols such as HTTP, HTTPS, SMTP and MIME. It uses the XML for information exchange. The messages received or returned by SOAP are called Request and Response envelopes. These are strictly based on XML and described in WSDL for that web service.
WSDL (Web Services Definition Language) defines, freely accessible approaches supported by the web service. The information it provides such as the name of methods, parameters passed to the web services and the values it returns. It is a standard for describing the web service methods. WSDL is a XML format that is used to represent online services. The following are the elements of WSDL.
definitions: This is the root variable which has web service name and its aim namespace.
Types: The data types used by web services are specified by this feature. To describe data forms, WSDL uses W3C’s XML Schema syntax.
Message: This explains the messages for request and answer.
PortType: This is the most essential web service feature. This describes operations such as the signals involved in the input and output / request and response.
Bindings: We describe the way messages are transported in the binding feature, i.e. the binding style and transport protocol.
Documentation: A concise overview of the service will be given.