Semantic MediaWiki has been enabled on WoWWiki in order to aid in data-finding. See Category:Semantic templates for all templates.
Semantic data is information that the wiki understands what it means, not just what it looks like. In the initial roll-out phase, semantic data is simply getting defined. The usage bit will come later, but imagine the possibilities of automatically-generated loot tables, and npc lists.
Semantic templates Edit
Several templates define semantic data using their parameters, and other Category:Semantic templates are being written as well.