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Message-ID: <3CF78155.ECEEAC88@apache.org>
Date: Fri, 31 May 2002 15:57:41 +0200
From: Stefano Mazzocchi <stefano@apache.org>
MIME-Version: 1.0
To: forrest-dev@xml.apache.org,
	Apache Cocoon <cocoon-dev@xml.apache.org>
Subject: Re: images problem in css during build
References: <5.1.0.14.0.20020531103832.039293f0@mail.visitronics.be>
 <001301c20881$ef6e45a0$670004c0@PC103>
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Cross-posting because this requirement originated on forrest but hits
Cocoon design.

Nicola Ken Barozzi wrote:

> Someone has time to fix-propose something better for link finding in the
> crawler?

The problem is: CSS may link to images and the Cocoon crawler isn't able
to recognize any hyperlinking behavior which is not included in a stream
of SAX events.

This is due to a design limitation of Cocoon views: only multi-staged
pipelines can have views.

If we had the ability to propose 'variants' of resources read by Cocoon
(via "map:read") then no changes to the Cocoon crawler will be required.

I feel this is the most elegant way to deal with the issue.

The question is: how do we assign a view to a read resource?

 <map:readers>
  <map:reader name="resource" class="default">
   <map:view name="variantA" class="..."/>
   <map:view name="variantB" class="..."/>
  </map:reader>
 </map:readers>

then, the usual, 

 <map:match pattern="...">
  <map:read type="resource" src="..."/>
 </map:match>

where is the sitemap engine to choose which class to use to read the
resource depending on the asked view.

For CSS, we could do

 <map:readers>
  <map:reader name="CSS-reader" class="ResourceReader">
   <map:view name="links" class="CSSLinkReader"/>
  </map:reader>
 </map:readers>

then

 <map:match pattern="**.css">
  <map:read type="CSS-reader" src="{1}.css"/>
 </map:match>

NOTE: asking for a different view might change the MIME-type.

What do you think?

-- 
Stefano Mazzocchi      One must still have chaos in oneself to be
                          able to give birth to a dancing star.
<stefano@apache.org>                             Friedrich Nietzsche
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