public Book()
{
Tags = new List<BookTag>();
Author = new List<string>();
Translator = new List<string>();
Rating = new BookRating();
Title = "";
Subtitle = "";
AuthorIntro = "";
Imageurl = "";
Summary = "";
Isbn = "";
Pages = "";
Price = "";
Publisher = "";
Pubdate = "";
Binding = "";
Weblink = "";
}