Web Service Description Language
Since SOAP's conception, the designers planned for it to support a type system—the one they chose was XML Schema. The SOAP specification enables you to describe type information in one of two ways.
NOTE
Section 5 of the SOAP specification defines one possible way to encode SOAP messages, specifically with regard to arrays, references, structs, and so on. This plays a part in self-describing messages—information such as jagged arrays must be described within the message because you don't know the size of its contents until serialization time. A similar parallel can be drawn with polymorphic types.
The first way relies on the use of the xsi:type attribute within your SOAP messages. In this way, each message can ...
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