In CampaignFeed, we usually get an array of PlaceHolderTypes shows what 
type of extension is associated to this campaign, here are 2 questions:
- I only saw this array contains 1 placeHolderType (e.g. {17} for Callout 
extension), is there any possibility this array has size larger than 1?
- For message extension's CampaignFeed, PlaceHolderTypes[] field is null, 
which is different than any other extension, why is that?

Thanks

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  • PlaceHolderTypes ... Dongliang Yu
    • Re: PlaceHol... 'Josh Radcliff (AdWords API Team)' via AdWords API Forum
      • Re: Plac... 'Josh Radcliff (AdWords API Team)' via AdWords API Forum

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