Straightforward self explanatory question really as described in the title. Magic Item Compendium presents activating magic items in this manner [Action Type] (type of action) as per page 220. Is anyone aware of an update to the DMG that describes magic items presented therein in the same format?
Take for example a RING OF LIGHTNING FLASHES page 125 of Magic Item Compendium we can see that the activation is [Swift] (mental) which produces a comparable spell effect that results in direct damage. Whereas a reading of a RING OF ELEMENTAL COMMAND (Fire) page 231 DMG any of the following Burning hands, Flaming sphere, Wall of fire or Flame strike requires a standard action to activate. This kind of disparity in action economy seems a little odd to me. Just to be clear I understand that Swift and Immediate actions were introduced after the DMG was published, hence the question.