def xml(t)
      t.campaignId campaign.id
      t.name name
      t.status "ENABLED"
      @bids.to_xml(t) if @bids
    end
def xml(t)
      t.campaignId campaign.id
      t.name name
      t.status "ENABLED"
      @bids.to_xml(t) if @bids
    end
Build xml into Builder

 @param [Builder::XmlMarkup]