~WEB SERVICES~

Assalamualaikum my friends..

                I’m sorry because I’m little bit late to update my blog. For last two week it’s hard to me to get some time to publish new post because I’m little bit busy with other assignment. Today I’m continuing with other topic that discussed in my class last week which is web services.

 What is web service???

Web services are client and server applications that communicate over the World Wide Web’s (WWW) Hypertext Transfer Protocol (HTTP). In difference word it allows different application from different sources to communicate each other even in different platform. Below is the figure 1.1 of Web service architecture.

Figure 1.1

Roles in web service architecture	Operation in web service architecture
Service Registry The registry provides a central place where developers can publish new service or their service descriptions.	Publish Service descriptions need to be published for service requestor to find them
Service Provider The service provider implements the service and makes it available on the internet.	Find  Service requestor retrieves a service description directly
Service Requestor This is consumer of the web service. Application looking for and invoking an interaction with a service	Bind  Service requestor invokes an interaction with the service at run time

Table 1.3

There are several types of web services components which are XML, SOAP, WSDL and UDDI. The table below describing the general purpose of web services types. 

XML	SOAP	WSDL	UDDI
The general function of XML is to store data.	To transport the data through internet.	Is used to describing the services that available.	Is used for listing services that are available.