Hver udgave af XML Web Service skal have et entydigt navneområde, så klientprogrammerne kan kende den fra andre tjenester på internettet. http://tempuri.org/ kan bruges til XML Web Service, der er under udvikling, men udgivne udgaver af XML Web Service bør bruge et mere permanent navneområde.

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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. http://tempuri.org/ is available for XML Web services that are under development, but published XML Web services should use a more permanent namespace.

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