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Robert M. O'Bara authored
* Added the concept of Unique Roles * ComponentItem now has a isValueValid method that bases validy on its current state as well as the uniquness of its role * Split attribute construction from attribute building - this way Item::attribute() can be called safely * Updated XML abd JSON to support unique roles * Fixed ReferenceItem so it will unset its values (and therefore updating the resource's links) when teh item is deleted.
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