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From "Nathaniel Alfred" <Alfred.Nathan...@swx.com>
Subject RE: [woody] binding the forms to data
Date Tue, 01 Jul 2003 07:14:29 GMT
> -----Original Message-----
> From: Marc Portier [mailto:mpo@outerthought.org]
> Sent: Dienstag, 1. Juli 2003 07:37
> To: cocoon-dev@xml.apache.org
> Subject: [woody] binding the forms to data
> 
...
> 
> The actual binding definition file could be filled with:
> <bnd:field id="widget-name"
>             path="xpath expression into model" />

I don't see the added value of putting the binding definition into
a separate file.  It should be inside the woody-definition file to
avoid yet another maintenance nightmare of joining two XML files by
an id. 

> Using JXPath there should be a fairly easy way to have this 
> binding work for a backend producing either javabeans or XML files.
>
> what do people think?
 
The possibility to define constant initial values in <wd:datatype>
is urgently needed.  To have an easy way to set it dynamically would
be really cool.

<wd:field id="widget-name">
  <wd:datatype base="string">
    <wd:initial>constant value</wd:initial>
    <!-- or -->
    <wd:initial path="'constant value'"/>
    <!-- dynamic -->
    <wd:initial path="xpath expression into model"/>
  </wd:datatype>
</wd:field> 

A general load/save binding specification in XML can get pretty
nasty for real-world examples with one-to-many and many-to-one 
mappings between external form and model attributes.

I'd say Woody should stick to the rule to have a simple solution
for simple problems and provide hooks for solving difficult problems
in Java.

Cheers, Alfred.

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