/// <summary>
        /// Remove duplicate annotations that might be added
        /// </summary>
        /// <param name="payload">payload to remove duplicate annotations for</param>
        public static void RemoveEPMDuplicationAnnotations(ODataPayloadElement payload)
        {
            ODataLibPayloadElementComparer comparer = new ODataLibPayloadElementComparer();

            for (int i = 0; i < payload.Annotations.Count; i++)
            {
                var epmAnn1 = payload.Annotations[i] as XmlTreeAnnotation;
                if (epmAnn1 == null)
                {
                    continue;
                }
                for (int j = i + 1; j < payload.Annotations.Count; j++)
                {
                    var epmAnn2 = payload.Annotations[j] as XmlTreeAnnotation;
                    if (epmAnn2 == null)
                    {
                        continue;
                    }
                    if (epmAnn1.LocalName == epmAnn2.LocalName && epmAnn1.NamespaceName == epmAnn2.NamespaceName)
                    {
                        payload.Annotations.RemoveAt(j);
                    }
                }
            }
        }
 /// <summary>
 /// Remove duplicate annotations that might be added
 /// </summary>
 /// <param name="payload">payload to remove duplicate annotations for</param>
 public static void RemoveEPMDuplicationAnnotations(ODataPayloadElement payload)
 {
     ODataLibPayloadElementComparer comparer = new ODataLibPayloadElementComparer();
     for (int i = 0; i < payload.Annotations.Count; i++)
     {
         var epmAnn1 = payload.Annotations[i] as XmlTreeAnnotation;
         if (epmAnn1 == null)
         {
             continue;
         }
         for (int j = i + 1; j < payload.Annotations.Count; j++)
         {
             var epmAnn2 = payload.Annotations[j] as XmlTreeAnnotation;
             if (epmAnn2 == null)
             {
                 continue;
             }
             if (epmAnn1.LocalName == epmAnn2.LocalName && epmAnn1.NamespaceName == epmAnn2.NamespaceName)
             {
                 payload.Annotations.RemoveAt(j);
             }
         }
     }
 }