public void List_Available_Identifiers()
        {
            //    Get the list of identifier schemes
            ResourceListOfInstrumentIdTypeDescriptor identifiers = _instrumentsApi.GetInstrumentIdentifierTypes();

            //    Schemes are returned as descriptors containing the name, property key and uniqueness constraint
            foreach (InstrumentIdTypeDescriptor scheme in identifiers.Values)
            {
                Console.WriteLine($"name: {scheme.IdentifierType}\nproperty key: {scheme.PropertyKey}\nis unique: {scheme.IsUniqueIdentifierType}\n");
            }
        }