internal void SetChildNode(string key, string value)
 {
     if (!AdditionalChildNodes.ContainsKey(key))
     {
         AdditionalChildNodes.Add(key, value);
     }
     else
     {
         AdditionalChildNodes[key] = value;
     }
 }
        internal void SetChildXmlNode(string key, string value)
        {
            string keyToUse = $"Xml:{key}";

            if (!AdditionalChildNodes.ContainsKey(keyToUse))
            {
                AdditionalChildNodes.Add(keyToUse, value);
            }
            else
            {
                AdditionalChildNodes[keyToUse] = value;
            }
        }