public static void SetStringExtension(this IExtendable extendable, string uri, string value)
 {
     extendable.SetExtension(uri, new FhirString(value));
 }
 public static void SetBoolExtension(this IExtendable extendable, string uri, bool value)
 {
     extendable.SetExtension(uri, new FhirBoolean(value));
 }
 public static void SetIntegerExtension(this IExtendable extendable, string uri, int value)
 {
     extendable.SetExtension(uri, new Integer(value));
 }