carddav - multiple collections (addressbooks) not possible

# actual behaviour

OSX CardDav client has no support for multiple collections ( addressbooks )

# expected behaviour

* have a list with checkbox to toggle the collection-items within the accounts/accountname/server-settings tab of contacts.app

# description

in a carddav structure you have principles (users) and each principle can have multiple collections ( fg. addressbooks ). A common scenario in carddav is to have multiple collections per purpose. If you connect with OSX CardDav Client you only can connect to one collection (where other carddav clients let you choose and select items individually) which is really a pain in the a..

# related Posts

* https://github.com/owncloud/core/issues/6727

* https://discussions.apple.com/thread/5455480

* http://sabre.io/dav/clients/osx-addressbook/

* http://tools.ietf.org/html/rfc6352

# way to reproduce

* Install Owncloud on any (virtual)webserver / alternatively run any other CardDav server environment

* Create 2 addressbooks for your user (private,corporate) on the server

* Try to connect to these two addressbooks through one account with OSX CardDav client

# crossreference

* OSX Feedback Assistant issue 478242

# purpose of this post

Make this issue more visible to search engines and add opinions for other users. Perhaps a developer or apple support catches this one within the next ten years, or cherrypicks this with luck.