Article <|-- Book

class Article{
    <<Abstract>>
    + «property» Id: string
    - price: decimal
    + SetPrice(priceP: decimal) 
    + GetPrice() decimal
    + Article(idP: string, priceP: decimal)
    + ShippingCosts() decimal*
}

class Book{
    + «property» Title: string
    + Book(idP: string, priceP: decimal, titleP: string)
    + ShippingCosts() decimal
    
}