code: public void unregister(ICalPropertyScribe<? extends ICalProperty> scribe) {
  		for (ICalVersion version : ICalVersion.values()) {
  			experimentalPropByName.remove(propertyNameKey(scribe, version));
  		}
  		experimentalPropByClass.remove(scribe.getPropertyClass());
  		experimentalPropByQName.remove(scribe.getQName());
  	}
docs: Unregisters a property scribe
  @param scribe the scribe to unregister