MVVM for Multi Platforms

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace GeographicRepresentation.Interfaces
{
    /// <summary>
    /// Present data of a continent
    /// </summary>
    public interface IContinentViewModel
    {
        /// <summary>
        /// A unique identifier for the continent
        /// </summary>
        Guid Id
        {
            get;
        }

        string ContinentName
        {
            get;
            set;
        }

        int NumberOfCountries
        {
            get;
            set;
        }

        string BestCityToBeIn
        {
            get;
            set;
        }        
    }

    /// <summary>
    /// This interface presents a view model for simply viewing data over the continent, without the ability to change it
    /// </summary>
    public interface IReadOnlyContinentViewModel : IContinentViewModel, IReadOnlyViewModel
    {
        /// <summary>
        /// A list of the countries within the continent
        /// </summary>
        IList<IReadonlyCountryViewModel> Countries
        {
            get;
        }

        #region Events

        /// <summary>
        /// Event which occurs once the best city to be in changes
        /// </summary>
        event SimpleOperationDelegate OnBestCityToBeInChanged;

        #endregion
    }

    /// <summary>
    /// This interface presents a view model for adding or editing data over a continent
    /// </summary>
    public interface IEditableContinentViewModel : IContinentViewModel, IEditableObject
    {
        
    }
}