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https://issues.apache.org/jira/browse/SLING-2502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13295048#comment-13295048
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Carsten Ziegeler commented on SLING-2502:
-----------------------------------------

You can call getNamespaceURI(prefix) on the jcr session, if that works, the 
prefix exists. If it throws a NamespaceException, the prefix doesn't exist
Not nice, I agree, but it should do the trick
                
> Incorrect escaping of property names in JcrModifiablePropertyMap on save
> ------------------------------------------------------------------------
>
>                 Key: SLING-2502
>                 URL: https://issues.apache.org/jira/browse/SLING-2502
>             Project: Sling
>          Issue Type: Bug
>          Components: JCR
>    Affects Versions: JCR Resource 2.1.0
>            Reporter: Alex Parvulescu
>         Attachments: SLING-2502.patch, org.apache.sling.jcr.resource.patch
>
>
> This follows SLING-2425 where there was a change in the way JCR properties 
> are escaped before being persited.
> The regression happens for properties that have ":" in the name.
> For example: jcr:title after the #save() call will turn into jcr%3Atitle so 
> the node will end up with a brand new property, instead of having the old 
> jcr:title updated.

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