Umbraco-CMS/src/Umbraco.Web/Trees/CoreTreeAttribute.cs

using System;

namespace Umbraco.Web.Trees
{
    /// <summary>
    /// Indicates that a tree is a core tree and should not be treated as a plugin tree.
    /// </summary>
    /// <remarks>
    /// This ensures that umbraco will look in the umbraco folders for views for this tree.
    /// </remarks>
    [AttributeUsage(AttributeTargets.Class, AllowMultiple = false)]
    internal class CoreTreeAttribute : Attribute
    { }
}