Indicates if this campaign is a normal campaign, a draft campaign, or an experiment campaign.
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                Not specified. | 
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                Used for return value only. Represents value unknown in this version. | 
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                This is a regular campaign. | 
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                This is a draft version of a campaign. It has some modifications from a base campaign, but it does not serve or accrue metrics. | 
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                This is an experiment version of a campaign. It has some modifications from a base campaign, and a percentage of traffic is being diverted from the BASE campaign to this experiment campaign. |