IsObsoleteAttribute
This attribute indicates the node is obsolete
            
using System;
namespace Autodesk.DesignScript.Runtime
{
    [AttributeUsage(AttributeTargets.Method)]
    public class IsObsoleteAttribute : Attribute
    {
        public string Message { get; set; }
        public IsObsoleteAttribute()
        {
            Message = string.Empty;
        }
        public IsObsoleteAttribute(string message)
        {
            Message = message;
        }
    }
}