Rails - Jan 2006 - yaml: custom saving and loading of specific classes

I''m trying to use ruby''s yaml library to serialise and
deserialise some
legacy classes.  Simply adding a to_yaml_properties() method isn''t 
sufficient as special methods need to be called to get and set the 
properties (they''re not stored simply in instance variables that I can 
access), and I don''t want to change the class any more than I have to. 
Can anyone offer any pointers on how to get some custom code executed 
when an instance of such a class is serialised and deserialised?  What 
I''d like to do is, when I call YAML.dump(), and it sees an instance of 
the legacy class, to convert it into some data structure and dump that, 
and do the reverse on YAML.load().  I''m guessing I can do part of this 
with the to_yaml() function, but I haven''t been able to find an
adequate
reference anywhere.  I''d really appreciate any help anyone could give 
me.  Thanks.

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