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Each XML Web service needs a unique namespace in order for client applications to distinguish it from other services on the Web.
tempuri.org is the test default namespace URI used by Microsoft development products, like Visual Studio. It is available for XML Web services that are under development, but published XML Web services should use a more permanent namespace. The term is strictly a placeholder and all instances of it should be replaced with a more meaningful URI in production systems.
An XML Web service should be identified by a namespace that is controlled by its company. For example, a company's Internet domain name could be used as part of the namespace. Although many XML Web service namespaces look like URLs, they need not point to actual resources on the Web. (XML Web service namespaces are URIs.)
For XML Web services creating using ASP.NET, the default namespace can be changed using the WebService attribute's Namespace property. The WebService attribute is an attribute applied to the class that contains the XML Web service methods.
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