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Your articel is fine. I think, the distinction between primary and secondary namespace refers to the technical method used in order to resolve the URI: da a HTTP GET on the first part (before # sign) and do in-document-adressing using the second part.
Consider http://www.example.com/page.html#anchor
But in fact the URI starts using www.example.com, which is already three levels of namespace. The fragment identifier is only the very last part of all namespaces.
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