I am going to start by making a bold statement, then support that statement
with my observations. After introducing XML + XSLT into your architecture
the need for Java Server Pages disappears!
The Model 2 architecture follows the MVC pattern. The MVC pattern makes a
lot of sense for dividing the responsibilities of User Interfaces, include
web user interfaces.
Model 3 (2++) attempts to remove the complexity of looping and
conditional-branching within the "view". In your "model 3" (2++)
architecture you add two additional technologies to accomplish this - XML
(Model) and XSLT (View).
For argument sake let's say that XML adds another layer to the model. I
want to maintain the separation of logic, presentation and data. We use JSP
to create XML from the JavaBean in Model 2. --> The JSP becomes a
conversion specification. It doesn't makes sense to utilize JSP as a
conversion specification... one would quickly discover that all that was
happening was converting properties to an attributes and objects to
elements. This would easily be automated.
I could also remove the JavaBean layer all together and replace it with a
XML to represent my data. After I can retrieve my Model in XML, my JSP
completely loses its use. I just return the XML + XSLT to Cocoon and it
returns the HTML page.
This table summarizes the shift:
Model 2 --> Model 3
(2++)
Model JavaBeans --> XML
View JSP --> XSLT
Controller Servlet --> Servlet
In regards to Model ++2... It is just Model 2 where the JSPs are not created
by developers or designers but by machine. This is detailed by Daniel in a
previous message.
At this point, I am not convinced that we have a new architecture,
especially a JSP architecture. Let me know your thoughts.
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