code: @XmlElementDecl(namespace = "http://books.com", name = "Book")
      public JAXBElement<Book> createBook(Book value) {
          return new JAXBElement<Book>(_Book_QNAME, Book.class, null, value);
      }
docs: Create an instance of {@link JAXBElement }{@code <}
  {@link Book }{@code >}