code: public void assertNone(final String propertyName, final PropertyList properties) throws ValidationException {
          if (properties.getProperty(propertyName) != null) {
              throw new ValidationException(ASSERT_NONE_MESSAGE, new Object[] {propertyName});
          }
      }
docs: Ensure a property doesn't occur in the specified list.
  @param propertyName the name of a property
  @param properties a list of properties
  @throws ValidationException thrown when the specified property
  is found in the list of properties