Combat Maneuvers as Attacks of Opportunity

[Krathognis]

From Thredok:

I reread the AOO and Combat Maneuvers sections and this is what I read.  All are called maneuvers and not attacks but disarm, sunder and trip all explicitly state they can be made in place of a melee attack (reinforcing in my mind the idea they are not attacks themselves) or bull rush to replace the melee attack at the end of a charge. Grapple specifically states that it requires a standard action and not an attack.  All of the maneuvers provoke their own AOO unless you have the relative improved x feat.  And you can only threaten a square if you have a weapon in hand or can make lethal damage attacks barehanded.

So for my PF games we will say that the options for an AOO (baring a feat or ability modifier) are:
A Single melee attack at highest attack bonus OR
A Disarm attempt (provoking an AOO) OR
A Sunder attempt (provoking an AOO) OR
A Trip attempt (provoking and AOO)