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https://issues.apache.org/jira/browse/JCR-4046?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15604160#comment-15604160
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Carsten Ziegeler commented on JCR-4046:
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Getting back to Sling's use case :) We don't want to have the change reported
on the parent for every child named "jcr:content", just for files.
So for example, there is a listener registered at /libs listening for all
changes, add, removals. But only for change events for jcr:content child nodes
of a file, the change should be reported on the parent. For add/remove this is
not needed as explained in the summary and for other node types it would be
wrong and break existing code.
> Improve observation of files
> ----------------------------
>
> Key: JCR-4046
> URL: https://issues.apache.org/jira/browse/JCR-4046
> Project: Jackrabbit Content Repository
> Issue Type: Improvement
> Components: core
> Reporter: Carsten Ziegeler
> Attachments: JCR-4046.patch
>
>
> A file in JCR is represented by at least two nodes, the nt:file node and a
> child node named jcr:content holding the contents of the file (and metadata).
> This has the consequence that if the contents of a file changes, a change
> event of the jcr:content node is reported - but not of the nt:file node.
> This makes creating listeners listening for changes in files complicated, as
> you can't use the file name to filter - especially with glob patterns (see
> JCR-4044) this becomes troublesome.
> In addition, whenever you get a change for a jcr:content node, you have to
> check if the parent is a nt:file node and decide based on the result.
> It would be great to have a flag on the JackrabbitEventFilter to enable
> smarter reporting just for nt:files: if a property on jcr:content is changed,
> a change to the nt:file node is reported.
> See also SLING-6163 and OAK-4940
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