[Class(Lazy = false)]
public class NewsItem : Entity
{
    [Property(NotNull = true)]
    public string Title { get; set; }

    [Property(NotNull = true, Length = 8000)]
    public string Body { get; set; }

    private IList<NewsImage> images = new List<NewsImage>();

    private DateTime publishDate = DateTime.Now;

    [List(Lazy = false)]
    [Key(1, Column = "NewsItemId")]
    [Index(2, Column = "ImageOrder")]
    [CompositeElement(3, ClassType = typeof(NewsImage))]
   
    public IList<NewsImage> Images
    {
        get { return images; }
        set { images = value; }
    }

    [Property(NotNull = true)]
    public DateTime PublishDate
    {
        get { return publishDate; }
        set { publishDate = value; }
    }

    [Property(NotNull = true)]
    public bool Display { get; set; }
}

[Component]
public class NewsImage : Entity
{
    [Property]
    public string Caption { get; set; }

    [Property()]
    public string Filename { get; set; }

    [Property()]
    public int ImageOrder { get; set; }

    public bool Equals(NewsImage obj)
    {
        if (ReferenceEquals(null, obj)) return false;
        if (ReferenceEquals(this, obj)) return true;
        return Equals(obj.Caption, Caption) && Equals(obj.Filename, Filename) && obj.ImageOrder == ImageOrder;
    }

    public override bool Equals(object obj)
    {
        if (ReferenceEquals(null, obj)) return false;
        if (ReferenceEquals(this, obj)) return true;
        if (obj.GetType() != typeof (NewsImage)) return false;
        return Equals((NewsImage) obj);
    }

    public override int GetHashCode()
    {
        unchecked
        {
            int result = (Caption != null ? Caption.GetHashCode() : 0);
            result = (result*397) ^ (Filename != null ? Filename.GetHashCode() : 0);
            result = (result*397) ^ ImageOrder;
            return result;
        }
    }
}