in src/main/scala/com/gu/commercial/display/AdTargetParam.scala [116:120]
def from(item: Content): Option[ObserverParam] =
SingleValue.fromRaw(if (item.tags.exists(_.id == "publication/theobserver")) "t" else "") map (ObserverParam(_))
}
case class PathParam(value: SingleValue) extends AdTargetParam {