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Web services require reliable communication over a wide area. While Internet can be used for this communications, for customers these web services must satisfy requirements for security, availability, reliability, and performance/scalability. Additionally, these web services must be readily integrated into existing communication networks at the communication end points. This paper considers the use of web services based OPC Unified Architecture. In order for utilities to more effectively control equipment, users must be able to communicate reliably with load control systems and devices. Frequently, communication system designers will start by developing a set of XML documents that get exchanged between parties.
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