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https://issues.apache.org/jira/browse/SLING-2853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13649546#comment-13649546
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Amit Gupta commented on SLING-2853:
-----------------------------------

As far as structure is concerned

  + <collection> # anything but maybe at least nt:hierarchyNode
     + jcr:content # anything; but not nt:hierarchyNode
         - jcr:title # maybe
         +- ....
         + sling:members

members can be namespaced +1

jcr:content would be good addition to content structure to make it future proof 
for extension.

meanwhile, can someone please add it the patch in current state to 
contrib/extensions. I have added two Mock classes in tests, those can be merged 
in commons testing, but then commons testing must use new sling api version.
                
> Add ResourceCollection to Sling
> -------------------------------
>
>                 Key: SLING-2853
>                 URL: https://issues.apache.org/jira/browse/SLING-2853
>             Project: Sling
>          Issue Type: New Feature
>          Components: API
>    Affects Versions: API 2.0.2
>            Reporter: Amit Gupta
>            Priority: Minor
>         Attachments: collection_v2.zip, collection_v3.zip, collection_v4.zip, 
> collection.zip, resourcecollection.zip
>
>
> Creating a collection of resources has been a use case for a while and there 
> has been no inherent support in SLING for the same.
> This proposal is to add a ResourceCollection interface and implementation 
> that allows creation of collection of resources. 
> Collection is a simple list of members, where each member contains path of 
> resource it refers to. In future, we might need to store additional 
> information with the member, hence following structure is proposed
> N: resourceCollection (nt:unstructured)
>         + P: sling:resourceType
>         + N : members (nt:unstructured)
>             + N: member_res1  > nt:unstructured
>                 + P: path > string, reference to actual resource
>             + N: member_res2  > nt:unstructured
>                 + P: path > string, reference to actual resource

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