code: public java.util.List<PropertyDifference> getPropertyDifferences() {
          if (propertyDifferences == null) {
              propertyDifferences = new com.amazonaws.internal.SdkInternalList<PropertyDifference>();
          }
          return propertyDifferences;
      }
docs: <p>
  A collection of the resource properties whose actual values differ from their expected values. These will be
  present only for resources whose <code>StackResourceDriftStatus</code> is <code>MODIFIED</code>.
  </p>
  
  @return A collection of the resource properties whose actual values differ from their expected values. These will
  be present only for resources whose <code>StackResourceDriftStatus</code> is <code>MODIFIED</code>.