This specification defines procedures for communication between network clients and devices. This new set of specifications makes it possible to build an alarm and electronic security system with clients and devices from different manufacturers using common and well defined interfaces. The functions defined in this specification covers discovery, device management and event framework. Supplementary dedicated services are defined in separate documents. The management and control interfaces defined in this standard are described as Web Services. This standard also contains full XML schema and Web Service Description Language (WSDL) definitions. In order to offer full plug-and-play interoperability, the standard defines procedures for device discovery. The device discovery mechanisms in the standard are based on the WS-Discovery specification with extensions. This specification doesn t in any way limit a manufacturer to add other protocol or extend the protocol defined here. For rules on how to extend this specification see section 5.14.