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https://issues.apache.org/jira/browse/SLING-2579?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13442544#comment-13442544
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Carsten Ziegeler commented on SLING-2579:
-----------------------------------------

The target attribute is like a filter, so the service with the reference gets 
only service which match this filter. In this case we still want all services 
but require to have at least a specific set.
Now, this could be done with two references, but that doesn't look to nice to 
me :)
With the way we have it now, the configuration is easier as well as the most 
common use case will be the PID - a target always requires a full filter 
definition
                
> ResourceResolverFactory should only be available if specific 
> ResourceProvider/Factories are registered
> ------------------------------------------------------------------------------------------------------
>
>                 Key: SLING-2579
>                 URL: https://issues.apache.org/jira/browse/SLING-2579
>             Project: Sling
>          Issue Type: Improvement
>          Components: ResourceResolver
>            Reporter: Carsten Ziegeler
>            Assignee: Carsten Ziegeler
>             Fix For: Resource Resolver 1.0.0
>
>
> The ResourceResolverFactory should only be available if a configurable set of 
> providers is available-
> We should add a string array property whose value can either be a pid or a 
> filter expression (starting with a '(')
> Only if for all configured values a matching provder/factory is available a 
> RRFactory will be registered

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