Umbraco-CMS/src/Umbraco.Core/Models/ContentEditing/IErrorModel.cs

using System.Collections.Generic;

namespace Umbraco.Cms.Core.Models.ContentEditing
{
    public interface IErrorModel
    {
        /// <summary>
        /// This is used for validation of a content item.
        /// </summary>
        /// <remarks>
        /// A content item can be invalid but still be saved. This occurs when there's property validation errors, we will
        /// still save the item but it cannot be published. So we need a way of returning validation errors as well as the
        /// updated model.
        /// </remarks>
        IDictionary<string, object> Errors { get; set; }
    }
}