[ 
http://issues.apache.org/jira/browse/JCR-241?page=comments#action_12331518 ] 

Roy T. Fielding commented on JCR-241:
-------------------------------------

oops, reading backward it seems like the original question was confusing.  I 
think what Jukka wants is to change an existing prefix "foo" to the empty 
prefix "", not to set the URI of the namespace to "".

> Remapping the default namespace
> -------------------------------
>
>          Key: JCR-241
>          URL: http://issues.apache.org/jira/browse/JCR-241
>      Project: Jackrabbit
>         Type: Wish
>     Reporter: Jukka Zitting
>     Priority: Minor
>      Fix For: 1.0

>
> I'm not sure if this is a bug, feature or standard behaviour, but currently 
> it is not possible to remap the default namespace to some other prefix. The 
> following code throws a NamespaceException:
>     session.setNamespacePrefix("foo", "");
> At least the Session.setNamespacePrefix() javadoc doesn't seem to prohibit 
> changing the prefix of the default namespace and I couldn't find anything 
> more specific in the JCR specification document. Restrictions are only placed 
> on remapping the xml namespace.
> Note that the current nodetype code is actually relying on the default 
> namespace being mapped to the empty prefix, so changing this would require 
> small changes there as well.
> I haven't really run into any cases where I'd have needed such functionality, 
> but it would be nice to clarify this issue.

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