As such, it forms a natural foundation for Web services that also need to exchange information encoded in XML. The SOAP specification describes a set of conventions for exchanging XML messages. Firewalls can recognize SOAP packets based on their content type ( text/xml-SOAP) and can filter messages based on information exposed in the SOAP message header. The data integration offered by XML also makes this technology a natural for Web-based computing such as Web services. By representing data using XML, you can access data from legacy systems as well as share your data with other enterprises. The fact that SOAP messages are encoded in XML makes SOAP messages portable, because XML is a portable, system-independent way of representing data. The structure of the data being exchanged is specified by an XML scheme. SOAP, the Simple Object Access Protocol, is a protocol that allows the exchange of structured data between peers in a decentralized, distributed environment.
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