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Why does the namespace in XML indicate http :?

Please clarify something for me. I study WCF and see the ServiceContractAttribute parameter with the Namespace = "http://www.mywebsite.com/andsoforth" parameter

I read in another question that Namespaces are unique opaque keys. Instead of using GUIDs, they are often URLs because legitimate ones are guaranteed to be unique.

Why is the "http:" schema specified with the namespace URL? Why not just a URL?

Thanks for clarifying this.

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In most cases, I prefer to make it clear that I am using a URN, which is a URI that is not a URL. I even add a prefix to the value so that it is clear that this is what I am doing. Something like this "urn: mycompany.com/schemas/services/foo/bar/20111119.

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