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Object References

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Shareable object references can be aware of versioning in following ways:

1. Always use latest version of referenced object
2. Always stay at current version
3. Notify author of referenced object updates

In all of these cases, changes to referenced object do _not_ constitute changes to referenceing object.

Object change notifications

There are few ways to notify referrer about change of referenced object. When reference is made, referer choses what he wants.

Email notification

* Each change - an email
* Digest - user gets summary of changes in all objects once in a while

Special page

Special page which provides filtered summary of changes, i.e. for all objects referenced by given course.