Attributes
text_node :best_offer_id, 'BestOfferID', :optional => true
time_node :expiration_time, 'ExpirationTime', :optional => true
object_node :buyer, 'Buyer', :class => User, :optional => true
money_node :price, 'Price', :optional => true
text_node :status, 'Status', :optional => true
numeric_node :quantity, 'Quantity', :optional => true
text_node :buyer_message, 'BuyerMessage', :optional => true
text_node :seller_message, 'SellerMessage', :optional => true
text_node :best_offer_code_type, 'BestOfferCodeType', :optional => true
text_node :call_status, 'CallStatus', :optional => true