code: public void wipeProperty(String propertyName)
      {
          if (propertyName != null)
          {
              propertyNames.remove(propertyName);
              if (properties.containsKey(propertyName))
              {
                  properties.remove(propertyName);
              }
          }
      }
docs: If a property with the specified name exists, it is removed from this feature. if the given propertyname
  is null, the call is ignored. Note that this method has no effect whatsoever regarding the geometry or id property.
  @param propertyName the name of the property to wipe.