code: public ICalPropertyScribe<? extends ICalProperty> getPropertyScribe(Class<? extends ICalProperty> clazz) {
  		ICalPropertyScribe<? extends ICalProperty> scribe = experimentalPropByClass.get(clazz);
  		if (scribe != null) {
  			return scribe;
  		}
  
  		return standardPropByClass.get(clazz);
  	}
docs: Gets a property scribe by class.
  @param clazz the property class
  @return the property scribe or null if not found