anchor.diff:  
     # Whether a user can make an offer on the work
     isOfferable: Boolean
  +
  +  # Whether a user can make an offer on the work through inquiry
  +  isOfferableFromInquiry: Boolean
     isSold: Boolean
     saleMessage: String
   }
  
positive.code:   isAcquireable: Boolean
    isForSale: Boolean
    isOfferable: Boolean
    isSold: Boolean
    listPrice: ListPrice
    price: String
  
negative.code: 
    # Whether a user can make an offer on a work
    isOfferable: Boolean
  
    # Whether a user can make an offer on the work through inquiry
    isOfferableFromInquiry: Boolean
    isOnHold: String
    isPriceHidden: Boolean
    isPriceRange: Boolean
  