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The document found at http://www.w3.org/2005/xpath-functions/collation/codepoint/ describes itself as a "namespace document", and speaks of the URI as "this namespace". However, the URI is not a namespace URI, it is a collation URI. Although it seems a reasonable extension of the W3C namespace policy for collation URIs to resolve to some resource, that resource should not be a namespace document, because the object identified by the URI is not a namespace.
Resolved, Jim Melton took an action to fix this (it can be changed in situ without formality).