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From "Konstantin Piroumian" <kpiroum...@apache.org>
Subject Re: Flow views, scratchpad taglib, and writing transformers
Date Wed, 26 Mar 2003 10:24:18 GMT
From: <volker.schmitt@basf-it-services.com>
>
> Hi Chris,
>
>

 <snip />

>
> > Then I came across Volker Schmitt's taglib in the scratchpad which looks
> > like exactly what I wanted:
>
> > http://marc.theaimsgroup.com/?l=xml-cocoon-dev&m=102227009022017&w=2
>
> > In my opinion, given the Cocoon flow layer and Cocoon's support for XSL,
> > we don't don't need extensive tag libraries, but instead just the
> > equivalent of a subset of JSTL core flow tags, and its expression
> language:
>
> > <if/>
> > <forEach/>
> > <choose/>
> > <out/>
>
> > In other words, just enough to navigate through the contents of the
> > "bean" object passed from the flow layer, in order to render output.
>
> > This is equivalent to the functionality Ovidiu included in the jpath Xsp
> > logic sheet.
>
> > And this is the functionality that JexlTransformer and JXPathTransformer
> > provide, with Jexl and JXPath as the expression languages, respectively.
>
> > I would like to reimplement JexlTransformer and JXPathTransformer using
> >   taglib (if anyone want's to help, let me know).
>
> If you need help, I can try.
> I think in the current taglib implementation the variable handling needs
> some rework. I thought about using Input/Output-Modules for this. This
mean
> writing something like a JXPath/Jexl/Velocity InputModule. The benefit is,
> that this can also be used inside the Sitemap (if it make sense). I think
> variable handling inside/outside a Sitemap should be a core component of
> cocoon. This is only RT, I have no real use case for this in the moment.

There are already JXPath-enabled input modules and a transformer in Cocoon
and they are already used inside the Sitemap, but I can see more use cases
for JXPath-enabled selectors/transformer and maybe even sitemap variables.

--
  Konstantin

>
> Regards,
>
> Volker
>
> > Assuming this works, I'd also like to reimplement XMLFormTransformer
> > using taglib and move taglib to the core as a proper API for writing
> > transformers in the future.
>
> > Thoughts?
>
> > Regards,
>
> > Chris
>
>
>
>
>
>
>


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