The methods relating to sorting in the auction house can operate on many columns, this identifier is used to indicate which column is being referenced. Valid values are:
- Item quality (All types)
- Item level (Only "list", "bidder")
- Auction duration (All types)
- Current buyout price? (Only "bidder")
- Status (High bidder or not??) (All types)
- Current bid (All types)
Not all of these sorts are valid for all auction types, those which are seen in the WoW UI code are indicated.