QoS pre-classify

in CCNP
Trying to wrap my head around Qos Pre-classify (for ONT), am I right with the following thinking:
-applying QoS service policy to the tunnel interface with or without the QoS pre-classify command will still mean that the QoS is applied to the pre-tunnel header, but only for the traffic in that tunnel.
-applying QoS service policy to the physical interface with QoS pre-classify will mean that the QoS is applied to pre-tunnel header info, and it will be for all the traffic in all the tunnel enumerating from the physical interface.
-applying QoS service policy to the physical interface without QoS pre-classify will mean that the QoS is applied to post-tunnel header info, again for all the traffic in all the tunnel enumerating from the physical interface.
help is much appreciated.
-applying QoS service policy to the tunnel interface with or without the QoS pre-classify command will still mean that the QoS is applied to the pre-tunnel header, but only for the traffic in that tunnel.
-applying QoS service policy to the physical interface with QoS pre-classify will mean that the QoS is applied to pre-tunnel header info, and it will be for all the traffic in all the tunnel enumerating from the physical interface.
-applying QoS service policy to the physical interface without QoS pre-classify will mean that the QoS is applied to post-tunnel header info, again for all the traffic in all the tunnel enumerating from the physical interface.
help is much appreciated.
Jack of all trades, master of none
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