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https://issues.apache.org/jira/browse/SLING-2534?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13416322#comment-13416322
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Carsten Ziegeler commented on SLING-2534:
-----------------------------------------

Yes, the switch would do that - however, just to clarify, empty strings withing 
Sling are treated as what they are, just empty strings in all other places - 
except the Sling post servlet (which is by design this way). So this is not 
about being jcr compliant or not being jcr compliant :)
                
> Strings of zero length on update in post servlet delete the property
> --------------------------------------------------------------------
>
>                 Key: SLING-2534
>                 URL: https://issues.apache.org/jira/browse/SLING-2534
>             Project: Sling
>          Issue Type: Bug
>          Components: Servlets
>    Affects Versions: Servlets Post 2.1.2
>            Reporter: Endolf
>         Attachments: blankstrings.patch
>
>
> According to JCR specs, for string type properties, a blank string should be 
> a valid value. Currently the post servlet delets any property where 1 or less 
> values are specifed and the 1 value has a 0 length. I think string properties 
> with a zero length should be blanked instead of deleted.

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