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https://issues.apache.org/jira/browse/CB-4735?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13757845#comment-13757845
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Braden Shepherdson commented on CB-4735:
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I'm not clear what workflow you're imagining here. The usual approach to 
optional dependencies that I've seen, for example in Arch Linux's pacman and 
Ubuntu et al's APT is, after installing a package (and its mandatory 
dependencies), to list optional dependencies and what adding them gives you, 
and maybe whether they're already installed, something like:

Optional dependencies:
BarcodeScanner - Scan barcodes for the child app
Geolocation - Attach location to your posts

These would be set in the <dependency> tag, I suggest, with <dependency 
url="..." ... optional="Scan barcodes for the child app" />
                
> Support optional plugin dependancies
> ------------------------------------
>
>                 Key: CB-4735
>                 URL: https://issues.apache.org/jira/browse/CB-4735
>             Project: Apache Cordova
>          Issue Type: Improvement
>          Components: CLI, Plugman
>    Affects Versions: 3.0.0
>            Reporter: Michal Mocny
>            Assignee: Braden Shepherdson
>
> plugins (and perhaps soon apps, and perhaps some future day platforms, too) 
> support plugin dependencies.  However, right now all dependents are mandatory 
> for the successful use of the depending plugin.  It would be nice to be able 
> to list optional dependencies which allow for conditional enhancement, but 
> are not a core requirement.
> One quick example: Logger for iOS would be a nice default dependency of the 
> platform, but should be safely removeable, and CLI should remember and 
> respect the users decision to remove it if they chose to.

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