namespace of WCF

Question

Hello everyone,

For the namespace defined for WCF, e.g.

http://msdn.microsoft.com/en-us/library/ms731835.aspx

[Code]
[ServiceContract(Namespace = "http://Microsoft.ServiceModel.Samples")]
[/Code]

my question is, what is it usage for developer? The only usage I found is used by the proxy class generated by meta data, and transparent to developer. When do we need to deal with namespace?

thanks in advance,
George