doc/protocol.rst: mention song id lifetime
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@ -702,7 +702,8 @@ Song ids on the other hand are stable: an id is assigned to a song
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when it is added, and will stay the same, no matter how much it is
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moved around. Adding the same song twice will assign different ids to
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them, and a deleted-and-readded song will have a new id. This way, a
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client can always be sure the correct song is being used.
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client can always be sure the correct song is being used. Song ids are not
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preserved across :program:`MPD` restarts.
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Many commands come in two flavors, one for each address type.
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Whenever possible, ids should be used.
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