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(Attack Action: An attack action is a type of standard action. Some combat options can modify only this specific sort of action. When taking an attack action, you can apply all appropriate options that modify an attack action. Thus, you can apply both Greater Weapon of the Chosen and Vital Strike to the same attack, as both modify your attack action. You can apply these to any combat option that takes the place of a melee attack made using an attack action (such as the trip combat maneuver), though options that increase damage don’t cause attacks to deal damage if they wouldn’t otherwise do so (such as Vital Strike and trip). You can’t combine options that modify attack actions with standard actions that aren’t attack actions, such as Cleave. Source: PZO9468)
So I find this confusing is a attack action just a fancy way of saying that its a standard action?