Namespaces are found and used even when not in hippo:namespaces. No warning is provided.

Normally all namespace are children of hippo:namespaces and I expected namespaces on other locations not to be used. However, they are used because they are searched based on node type. When I used 'update all content' a duplicate namespace lead to failure. No meaningful error message was given.

Use case:
I wanted to import an XML file containing a namespace with bug fixes. I did not delete the old namespace node, but moved it to /content/documents/old/ in order to be able to put it back in case of failure. I would not do this for documents, because UUID's would get wrong, but namespaces are not found by UUID. However, it went wrong anyway, because of the search based on node type.