elete_policy with a value of either 'complete' or 'allowed'. This method will first try to delete all references to the metaset. Each connected item's ACL is checked, if the reference may be safely deleted. If delete policy is set to 'complete', an exception is thrown if the process encounters a non-accessible object. With delete policy 'allowed', the process continues, trying to delete the other references. If the metaset is no longer used, it will be deleted completely.</p>
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