Chapter 5 Designing the integration Layer Database • The application stores data in a database; you can integrate databases and consumes the shared data. You can integrate your application to SQL as well as NoSQL databases as per use case requirement. File Transfer • You can consume data from the files. Applications produce files of shared data for other applications to consume, and consume files that others have produced. Integration Protocols Integration protocols (also called web services protocols) define the structure and definition of message transfer between two applications. SOAP It is a messaging protocol exchanging information while implementing web services. It uses the XML message format and works with HTTP protocol for message transmission. The message format mainly contains three elements: envelop, header, and body. An example of a typical SOAP envelope would be the following: POST /Transaction HTTP/1.1 Host: www.example.org Content-Type: application/soap+xml; charset=utf-8 Content-Length: 200 SOAPAction: "http://www.w3.org/2003/05/soap-envelope" 2000 158