Re: How to identify if a concept should be represented as a entity or as a value obj

I model entities after the expert's language, when he talks with his own
peers he use a name to identify an entity while he describes value objects.

For example, in a financial application he could use the RIC or the ISIN to
identify an entity, but he doesn't identify a monetary amount.


Giacomo



On Mon, Feb 25, 2013 at 5:58 AM, Remy Fannader <[email protected]> wrote:

> **
>
>
> Entities have a life-cycle of their own while the life-cycle of VOs is set
> by their use.
> That means that entities can identified independently and accessed by
> unknown applications.
>
> http://caminao.wordpress.com/how-to-represent-objects-and-activities/identities-2/identities/
> Remy.
>
> On 25 February 2013 06:46, sudarshan89 <[email protected]> wrote:
>
>> **
>>
>>
>>
>> I am trying to find out what question one must ask during the modelling
>> process to detect if a concept should be modeled as a entity or as a value
>> object.
>>
>> My current understanding is the below
>>
>> If in our domain a car engine can be swapped out and put in another car
>> then it has existence of its own (Aggregation) and hence cannot be a Value
>> Object ... However in our domain if the engine cannot be swapped out and
>> hence makes no sense without a car then it can be modeled as a Value Object
>> (Composition). Does this make any sense ?
>>
>> Please let me know what you think
>>
>> Thanks
>>
>>
>  
>