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https://issues.apache.org/jira/browse/SLING-4937?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15151789#comment-15151789
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Carsten Ziegeler commented on SLING-4937:
-----------------------------------------
As the issue title says, its about to remove namespace mapping support, but not
the support for the Sling-Namespace bundle header. I'll make this a little bit
more clear in the title
> Drop namespace mapping support
> ------------------------------
>
> Key: SLING-4937
> URL: https://issues.apache.org/jira/browse/SLING-4937
> Project: Sling
> Issue Type: Improvement
> Components: JCR
> Reporter: Carsten Ziegeler
> Assignee: Carsten Ziegeler
> Fix For: JCR Jackrabbit Server 2.3.0, JCR Base 2.3.0, JCR Oak
> Server 1.0.0
>
>
> I think we should support the support for namespace mapping from our jcr
> base module (and therefore from the jcr server implementations).
> The namespace support parses the Sling-Namespaces header of bundles and
> ensures that every session has namespace prefix mapping based on these
> headers ensuring a stable mapping. The main reason why we added this in
> the first place is, is that in theory one could map e.g. the sling
> namespace prefix to some own non Sling url. Which obviously would break
> all applications. Of course, no one really does this and even with this
> mapping behavuíour in place, I'm pretty sure apps would break if someone
> does crazy mappings as we only cover the part where the Sling API is
> used. Defaulting to the JCR API will probably use the wrong mapping.
> As implementing this mapping creates proxy objects for the session which
> is kind of heavy and I really think that this feature was never really
> useful, I think we should drop it.
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