[ 
http://issues.apache.org/jira/browse/JCR-242?page=comments#action_12331483 ] 

Stefan Guggisberg commented on JCR-242:
---------------------------------------

i share jukka's concerns:

+1 to automatically remapping the new namespace for sessions that have already 
mapped some other namespace to the same prefix.

> registration of new namespace does not respect existing session mappings
> ------------------------------------------------------------------------
>
>          Key: JCR-242
>          URL: http://issues.apache.org/jira/browse/JCR-242
>      Project: Jackrabbit
>         Type: Bug
>  Environment: r295031
>     Reporter: Tobias Strasser
>     Assignee: Stefan Guggisberg
>     Priority: Minor
>      Fix For: 1.0

>
> consider the following (starting with a default namespace registry):
> // remap nt namespace
> Session.setNamespacePrefix("foobar", "http://www.jcp.org/jcr/nt/1.0";);
> // create new namespace
> NamespaceRegistry.registerNamespace("foobar", "http://www.foo.org/bar/1.0";);
> now the session used above that remapped the nt namespace has an ambigous 
> namespace mapping:
> foobar --> "http://www.jcp.org/jcr/nt/1.0";
> "http://www.jcp.org/jcr/nt/1.0"; --> foobar
> "http://www.foo.org/bar/1.0"; --> foobar
> i.e. the new foobar namespace is hidden for this session. either the 
> registration should not work, or an automatic prefix is to be defined in all 
> local session mappings.

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