QuestString

Quest string and QuestLinks were added in patch 2.4.
== Quest String Formatting ==
Quest strings consist of the quest id and the quest level.
 quest:questId:questLevel
Note that the QuestID is actually used by wowhead and probably other sites - you can actually go to a quest page on wowhead, and change the end of the url to the in-game id, and you should get the page for that quest.