The PhotoFlags enumeration lists available photo flags. This enumeration is new in API version 1.4
enum PhotoFlags
{
HasTitle,
HasCaption,
HasKeywords,
HasCategories,
HasExif,
HasComments
}Photo flags are returned in the Flags field of the Photo snapshot. Applications can use this field to determine if they need to issue additional requests for information. For example, an application calling LoadPhotoSetPhotos and interested in photo captions for the photos it retrieves can check the presence of the HasCaption flag to determine if an additional LoadPhoto call is necessary.