MVVM for Multi Platforms

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

namespace GeographicRepresentation.Interfaces
{
    /// <summary>
    /// Present data of a country
    /// </summary>
    public interface ICountryViewModel
    {
        #region Properties

        /// <summary>
        /// A unqiue identifier for the city
        /// </summary>
        Guid Id
        {
            get;
        }

        string CountryName
        {
            get;
            set;
        }

        int Size
        {
            get;
            set;
        }        

        /// <summary>
        /// The countries birth rate
        /// </summary>
        float BirthRate
        {
            get;
            set;
        }

        #endregion
        
    }

    /// <summary>
    /// This interface presents a view model for simply viewing data over the country, without the ability to change it
    /// </summary>
    public interface IReadonlyCountryViewModel : ICountryViewModel, IReadOnlyViewModel
    {
        /// <summary>
        /// A list of the cities within the country
        /// </summary>
        IList<IReadOnlyCityViewModel> Cities
        {
            get;
        }

        #region Events

        /// <summary>
        /// Event which occurs once the birth rate changes
        /// </summary>
        event SimpleOperationDelegate OnBirthRateChanged;

        #endregion
    }

    /// <summary>
    /// This interface presents a view model for adding or editing data over a country
    /// </summary>
    public interface IEditableCountryViewModel : ICountryViewModel, IEditableObject
    {
        
    }
}