[ 
http://issues.apache.org/jira/browse/JCR-241?page=comments#action_12331479 ] 

Jukka Zitting commented on JCR-241:
-----------------------------------

Hmm, you are right. However it should probably be possible to map some other 
namespace to the empty prefix. As in:

    session.setNamespacePrefix("", "some-namespace");

For example to work with XML documents like:

    <document xmlns="some-namespace"/>

This however is not possible if you cannot remap the empty namespace in the 
first place.

> 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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