XML Web Service Plumbing

XML Web services are based on a cluster of open standards. Table 5-1 lists the key players.

Table 5-1. XML Web Service Technologies

Standard

Description

WSDL (Web Services Description Language)

An XML-based format that describes everything a client needs to interact with an XML Web service. This includes the XML Web service’s methods, the data types used for all parameters and return value, and the supported methods of communication.

HTTP (Hypertext Transfer Protocol)

The communication protocol used to send XML Web service requests and responses over the Internet.

SOAP (Simple Object Access ­Protocol)

An XML-based format used to encode the information in XML Web service messages. SOAP includes a rich, cross-platform ...

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