Serializable Book class with Catalog collection

Book.cs

/// <summary>
/// This is the Book class, it represents a book.
/// </summary>
[DataContract, Serializable, XmlRoot("book")]
public class Book
{
    #region Properties
    [DataMember, XmlAttribute("isbn")]
    public string Isbn { get; set; }
    [DataMember, XmlAttribute("title")]
    public string Title { get; set; }
    [DataMember, XmlAttribute("author")]
    public string Author { get; set; }
    [DataMember, XmlAttribute("publisher")]
    public string Publisher { get; set; }
    [DataMember, XmlAttribute("publication")]
    public DateTime Published { get; set; }
    [DataMember, XmlAttribute("pages")]
    public int Pages { get; set; }
    [DataMember, XmlAttribute("instock")]
    public bool InStock { get; set; }
    #endregion

    #region Constructors
    public Book()
    {
        /// <remarks>
        /// To be serialized by an XmlSerializer object, a class must have
        /// a default constructor. For additional information about XML
        /// Serialization Considerations, visit the following site: 
        /// http://msdn2.microsoft.com/en-us/library/182eeyhh(vs.71).aspx
        /// </remarks>
    }
    #endregion
}

/// <summary>
/// This is the Catalog class, it is a helper for the Book class.
/// </summary>
[DataContract, Serializable, XmlRoot("books"), XmlType("books")]
public class Catalog
{
    private List<Book> books = new List<Book>();
    [DataMember, XmlElement("book")]
    public List<Book> Books { get { return books; } }
}