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Date: Fri, 16 Jul 2004 10:46:04 +0200
From: Sylvain Wallez <sylvain@apache.org>
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To: dev@cocoon.apache.org
Cc: lenya-dev@cocoon.apache.org
Subject: Re: [RT] Virtual Sitemap Components
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Andreas Hartmann wrote:

> Carsten Ziegeler wrote:
>
>> I want to start the implementation of the virtual sitemap components
>> in the next weeks; but before, we should discuss how they will look 
>> like :)
>>
>> The first point - and imho most important point is, of which components
>> a virtual sitemap component (VSC) can be assembled.
>> My understand is that a VSC is either:
>> - a generator followed by one or more transformers
>> - a set of transformers
>> - a set of transformers followed by a serializer
>> Thus, the VSC acts like a generator, a transformer or a serializer.
>
>
> Sorry for cross-posting, but this could maybe address a concern
> Lenya is faced with.
>
> The scenario is as follows:
>
> Lenya provides so-called "CMS screens". This is a simple transformation
> to create the Lenya look-and-feel forms, error messages etc.
>
> It is done using a meta stylesheet approach triggered by
>
>   <map:transform src="cocoon://lenya-screen.xsl"/>
>
> The problem is that we would like to add a i18n step to this
> transformation, which would be quite difficult (if not impossible)
> to implement using a meta stylesheet. We don't use a resource
> because we need to access the transformation from a lot of sitemaps.
>
> My question is: Could VSCs be declared in the sitemap? For instance:
>
> <map:components>
>
>   <map:serializier name="lenya-screen" type="virtual">
>     <map:transform type="xslt" src="cocoon://lenya-screen.xsl"/>
>     <map:transform type="i18n"/>
>     <map:serialize type="xhtml"/>
>   </map:serializer>
>
> </map:components>
>
> Is this a possible scenario for the VSC concept?


Exactly.

> I think an important questions is how to pass parameters to a VSC and
> how to distribute them to the single components.


Passing parameters to a VSC is very similar to passing parameters to 
resources. There's however a special handling of the @src attribute that 
exists on generators and transformers, which does not exist on resources.

Example:

Definition (syntax and exact location still has to be defined):
<map:virtual-generator type="foo">
  <map:generate src="{src}"/>
  <map:act type="lang-select">
    <map:transform type="i18n"/>
  </map:act>
  <map:transform type="xslt" src="stylesheets/{bar}.xsl/>
</map:virtual-generator>

Usage:
<map:generate type="foo" src="blah">
  <map:parameter name="bar" value="baz"/>
</map:generate>

Sylvain

-- 
Sylvain Wallez                                  Anyware Technologies
http://www.apache.org/~sylvain           http://www.anyware-tech.com
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