The messaging layer in the protocol stack is based on an XML model. XML (Extensible Markup Language) is widely used in Web Services applications and is the foundation for all Web Services. XML is just one of the standards enabling Web Services to map between technology domains. You will find many resources on the Web that describe XML messaging. For more information, refer to the World Wide Web Consortium site on Messaging listed in the link list below.
The XML Messaging specification is a broadly-defined umbrella under which a number of more specific protocols are defined. One of the more popular standards is known as the Simple Object Access Protocol (SOAP) and is one of the most significant standards in communicating Web Services over the network. Just as XML provides a means for communicating over the Web using an XML document that both requests and responds to information between two disparate systems, SOAP allows the sender and the receiver of XML documents to support a common data transfer protocol for effective networked communication. You will find many resources on the Web that describe SOAP. For more information, refer to the World Wide Web Consortium site for SOAP. See the link list below.
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