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