Defines the targeting behavior of an ad spot.
||Line items not targeting this ad spot explicitly may serve in it.|
||Only line items targeting this ad spots explicitly may serve in it|
||If house ads are an allowed reservation type, they may serve in the ad spot regardless of whether they explicitly target it. Ads of other reservation types (whose type is allowed in the ad spot), may serve in the ad spot only if explicitly targeted.|
||The value returned if the actual value is not exposed by the requested API version.|