Doctrine supports aggregates and composites. When binding composites you can use methods Doctrine_Table::ownsOne() and Doctrine_Table::ownsMany(). When binding
aggregates you can use methods Doctrine_Table::hasOne() and Doctrine_Table::hasMany().
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In Doctrine if you bind an Email to a User using ownsOne or ownsMany methods, everytime User record calls save or delete the associated
Email record is also saved/deleted.
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Then again if you bind an Email to a User using hasOne or hasMany methods, everytime User record calls save or delete the associated
Email record is NOT saved/deleted.