Disable some ads in AdRotator XML

Is there a property that can be used to disable an AD in the ads xml file? which would result in ad not being displayed..
Something like this -->
openangular barcket Advertisements close angular bracket
openangular barcket Ad Enabled="false" close angular bracket
... ....
Ans:
if you want to disable a AD, you can give the Impression property to "0", it will not displayed.

Happy Programming