Web Services With Cobol Or RPG on IBM ISeries - Restful Php Web Services
Web Services and SOAP (or REST) are rapidly becoming state-of-art architectural approaches to allow the access of multiplatform and multilanguage systems,
Many companies have legacy applications which represent a high investment and Web Services promise to allow their access from the web without extensive modifications.
2. An Introduction to Web Services
Web services consist of a group of standards intended to make it possible for diverse systems to communicate, without requiring a particular type of middleware, programming language or even operating system. They can be based on SOAP, REST or XML-RPC,.
SOAP is an open source message standard, based on an XML dictionary, that uses standard transport protocols widely used over the Internet such as HTML or SMTP. It represents a paradigm shift in the way applications communicate with each other, because it does not require any special middleware to allow diverse applications to communicate. The messages are text based and accessible by any application over the network. They are described by using a special XML based language called WSDL.
REST is a simpler type of Web Service where the user simply accesses a URL to obtain back an XML document without any standard specification.