7. A metadata repository according to claim 4 , wherein the first object model comprises an External Element node to store a result element of the query, and wherein the second object model comprises: a Key Figure node to identify a result element of the External Element node as a key figure; a Characteristic node to identify a result element of the External Element node as a characteristic; and a Dimension node to identify a characteristic as a dimension.
7. A metadata repository according to claim 4 , wherein the first object model comprises an External Element node to store a result element of the query, and wherein the second object model comprises: a Key Figure node to identify a result element of the External Element node as a key figure; a Characteristic node to identify a result element of the External Element node as a characteristic; and a Dimension node to identify a characteristic as a dimension. 8. The metadata repository according to claim 7 , wherein the second object model comprises: a Key Figure Operator node to define a calculation on a key figure.