Embedded XML
The growth of XML has been remarkable, and it has many developers just looking for a reason to use it. But because XML is being used so frequently, it brings up some important questions about how it should be used in combination with XML messaging. Let's first take a closer look at the issues, and then we'll introduce some ideas that you will want to consider.
Entity References
You already know that a SOAP message is nothing more than an XML document that applies some packaging and encoding rules to information. Listing 9.1 shows an example SOAP request message for a simple message logging operation. In this case, clients can log arbitrary messages with the logging service.
Listing 9.1. SOAP LogMessage Operation
<SOAP-ENV:Envelope ... |
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