public KnowledgeGraphRelationshipTypeDescription( 
   string name
)

{
  await QueuedTask.Run(() =>
  {
    using (var kg = GetKnowledgeGraph(url))
    {
      var entity_name = "PhoneCall";
      var relate_name = "WhoCalledWho";

      var entityDesc = new KnowledgeGraphEntityTypeDescription(entity_name);
      var relateDesc = new KnowledgeGraphRelationshipTypeDescription(relate_name);

      //Run the schema builder
      try
      {
        SchemaBuilder sb = new(kg);
        sb.Delete(entityDesc);
        sb.Delete(relateDesc);
        //Use the KnowledgeGraph extension method 'ApplySchemaEdits(...)'
        //to refresh the Pro UI
        if (!kg.ApplySchemaEdits(sb))
        {
          var err_msg = string.Join(",", sb.ErrorMessages.ToArray());
          System.Diagnostics.Debug.WriteLine($"Entity/Relate Delete error: {err_msg}");
        }
      }
      catch (Exception ex)
      {
        System.Diagnostics.Debug.WriteLine(ex.ToString());
      }
    }
  });
}