Oracle Business Rules Question

Hi,
I'm pretty new with Oracle Rules. I've had no trouble using them, to date. I define Java classes, set up the facts in Rules Author, and create the Dictionary, Ruleset, and rules... etc.
I can run them fine, and the technology works as expected. My question is... what if my underlying data structures for the facts (the java class(es) in my case) change?
From what I see with the Rules Author tool, there isn't an obvious way to sync up the underlying fact with events on the ground. I can see there would be a really good reason for not allowing attributes/methods/props to be removed (without redoing (some of???) the rulesets/rules)... but I am really interested in the ability for adding methods/attributes/etc to the underlying structures without rework.
Here is my use case: I set up an initial fact and a ruleset for our clients with which to build rules. They add 500 rules. They now request the "fact" include another "new" attribute to be available in all new rules. Do I have to start over, and redo the 500 rules to accommodate the new attribute? There must be something which eases the pain... but I haven't found it yet.
Any help in this issue would be most appreciated!
Thanks,
Dan

Thanks for the reply. I guess I was making it more difficult than it deserved. I've been trying to "re" import... and never tried to import over the fact I already had.
Thanks!

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I just started with semantic so won't have many useful ideas for at least some time.
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Back up all data.
Launch the Keychain Access application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
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Select the login keychain from the list on the left side of the Keychain Access window. If your default keychain has a different name, select that.
If the lock icon in the top left corner of the window shows that the keychain is locked, click to unlock it. You'll be prompted for the keychain password, which is the same as your login password, unless you've changed it.
Right-click or control-click the login entry in the list. From the menu that pops up, select Change Settings for Keychain "login". In the sheet that opens, uncheck both boxes, if not already unchecked.
From the menu bar, select
Keychain Access ▹ Preferences ▹ First Aid
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