(property) A property is trivial if changing it does not "change" the object (i.e. mark it as modified) when the value changes; and it is not saved to disk or copied when the object is saved or copied, including copying to the kill ring. Trivial properties are generally used for storing temporary values that should only be associated with the specific part. [Whether a property is to be copied or saved may be specified independently, so the notion of "trivial" is a bit ambiguous. -- rgr, 12-Mar-00.