Amulet has special support for aggregation (the composition of
individual objects into composites with a single interface -- lists of
items and such) as well as the usual inheritance. The prototype
system can generate children from composite objects which inherit the
behavior (but not the actual instances) of the aggregated components.
This would directly support the copying of a section of text, a
heading, etc. to another spot or document, and the subsequent
alteration of that section without changing the original.
Ken Meltsner