Rake scheme_dump ignores foreighn keys?

Hi,

I’ve been using the rake task schecma_dump and scheme_import to copy
database structures (when we are several developers working on the same
RoR project), and have noticed that it does not dump all the foreign key
constraints.
We are using MySQL, and rails 1.0.

is this a known issue or something like this, or am i doing something
wropng ?
thanks,
Amir.