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Excerpts from Vijay Venkatachalam's message of 2014-06-09 21:48:43 -0700:
> 
> My vote is for option #2 (without the registration). It is simpler to start with this approach. How is delete handled though?
> 
> Ex. What is the expectation when user attempts to delete a certificate/container which is referred by an entity like LBaaS listener?
> 
> 
> 1.       Will there be validation in Barbican to prevent this? *OR*
> 
> 2.       LBaaS listener will have a dangling reference/pointer to certificate?
> 

Dangling reference. To avoid that, one should update all references
before deleting.