Pretty much right, save we get the mob and not the zone (we get the zone based on where we know the mob lives). Here's what a loot drop looks like in your log:
NPCID is the NPC's ID (we use that to know which zone map to use)
InstanceID is an ID we can't really use at this time due to a few factors (if they add full datetime + shard info to this, it would be useful, otherwise no)
LocationMap is which map it is (World of someInstanceNameHere)
Location(x|y|z) are the coordinates of the drop on the map
ItemID is the ID of the item dropped
Quantity is how many of the item
Coin is if the mob dropped an item and, say, 1 plat 23 gold 45 silver it would be 12345
That's all the info we get from a loot drop.
I'd need to look into a few things before adding would be a good idea. Let me make sure nothing new got added to differentiate an expert v normal v raid version of a mob. They have separate IDs (look up any dungeon boss,) and I'm pretty sure that's why, but it doesn't give info beyond that AFAIK.