public void Apply(Page p)
		{
            if (null != Content)
            {
                p.Content = Content.ToDomain();
            }
            if (null != Availability)
            {
                Availability.Apply(p);
            }
		}
		public static PageEditModel FromDomain(Page p)
		{
			return new PageEditModel {
			    Content = ContentEditModel.FromDomain(p.Content),
                Availability = AvailabilityEditModel.FromResource(p),
			};
		}