I'm looking to create some weapon and other item mods, I'm just starting to look at some of the core xml files as examples of what is needed.  Is there a list or guide with the various Attributes and Values that are valid? For example this section from a short sword:

What are valid damage types or where are they defined? I've seen UnitStat_CuttingDamage, UnitStat_BluntDamage, UnitStat_PierceDamage. Are there other types (fire, ice, etc.)? If I want to have a weapon have a chance to stun, does that need done through an ability or can it just be tacked on? Can a weapon have multiple damage types?

Thanks for the info in advance.