public class CIMPointCloudReturnFilter : CIMPointCloudFilter, System.ComponentModel.INotifyPropertyChanged, System.Xml.Serialization.IXmlSerializable  

//Must be called on the MCT
//var pcsl = ...;
IReadOnlyList<CIMPointCloudFilter> updatedFilter = pcsl.GetFilters();
foreach (var filter in updatedFilter)
{
  //There is either 0 or 1 of each
  if (filter is CIMPointCloudReturnFilter returnFilter)
  {
    PointCloudFilterDefinition pcfl = PointCloudFilterDefinition.FromCIM(updatedFilter);
    List<PointCloudReturnType> updatedReturnValues = pcfl.ReturnValues;

  }
  if (filter is CIMPointCloudValueFilter classCodesFilter)
  {
    // do something
  }

  if (filter is CIMPointCloudBitFieldFilter classFlagsFilter)
  {
    // do something
  }
}