Optionalid = NPC id. Shows superscript links to DBs.
Optionalsubdomain = Wowhead subdomain. Used when id = used. Currently supports subdomain=old, subdomain=ptr, or subdomain=mop (for Mists of Pandaria before it goes live). Only used for WoWDB (ptr only) and Wowhead (old, ptr, or mop).
Optionaldbmmoc = Show link to db.mmo-champion.com (suppressed by default). Used when id = used.