A person “saves” themselves into various domains when they register to vote, sign up for a mailing list, sign a petition, apply for citizenship. We could come up with all sorts of cute analogies where the immigration clerk is the DAO, etc., but the basic point is that these things are initiated by the person (and indeed some can only be initiated by the person themselves).
Jaime Metcher - http://blog.objectmentor.com/articles/2007/11/02/active-record-vs-objects
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