Do item bonuses such as Potency stack with enhancement bonuses such as Frost Manipulation?

Likewise, what about Ice Lore and Glacial Spellcasting...?

I assumed they do, since enhancement bonuses are usually "untyped", but I wanted clarification.

Thanks!

References:
http://compendium.ddo.com/wiki/Weapo..._the_Ogre_Magi

http://compendium.ddo.com/wiki/Enhan...nipulation_III


http://compendium.ddo.com/wiki/Armor:Frostflame_Robe

http://compendium.ddo.com/wiki/Enhan...ellcasting_III