I have just installed mediawiki and the semantic extension. If I write a test page like:

Test Type:Date [[start date:=June 11 2006]]

I get in the fact box the following error:

[Oops! No type defined for attribute]

Indeed the the page Attribute:Start_date in my wiki is empty.

How can I get the useful Types, Attributes and Classes  already  defined in ontoworld.org/wiki?