code: public RawProperty addExperimentalProperty(String name, ICalDataType dataType, String value) {
  		RawProperty raw = new RawProperty(name, dataType, value);
  		addProperty(raw);
  		return raw;
  	}
docs: Adds an experimental property to this component.
  @param name the property name (e.g. "X-ALT-DESC")
  @param dataType the property's data type or null if unknown
  @param value the property value
  @return the property object that was created