+1 on the two suggestions. It's still experimental but I also have SOA 
layer on top of ROA
layer with semi-dynamic datatyping. ROA exposes components which IT 
service layer uses,
which is than used by business service layer.

H.Ozawa

Steve Jones wrote:
> I'm not sure on completely arbitary.  But I do tend to use such tools
> but I have two simple rules,
>
> 1) Never expose directly, always use a Facade pattern
> 2) Never consumer directly, always use a proxy pattern
>
> These two simple things provide you with the ability to evolve
> elements independently.
>
> Steve
>
>
> On 11/12/06, Hitoshi Ozawa <[EMAIL PROTECTED]> wrote:
>   
>>
>>
>>
>>
>> +1. Client and server should also be completely arbitrary to make the system
>>  loosely coupled. Otherwise, we'll just end up with just a rewrite of the
>>  old system.
>>
>>  H.Ozawa
>>
>>
>>     

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