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From "Carsten Ziegeler" <>
Subject New Components From Avalon Scratchpad
Date Thu, 10 Jan 2002 15:50:27 GMT

as you all know, some time ago we decided to move some of the general 
components to Avalon Excalibur.
The first components now finished (hopefully) in avalon are the parser 
abstraction and a new source handling.

The question is now, how to reintegrate these new components?
The interface have - of course - changed. First, there are new package 
names and second some methods were changed, added etc.

So, as expected, this has the problem that the (re)integration is not
so easy.

As a first running component, I would like to use the "new" parser 

I see 2 possibilities to integrate it:
The first step would always be the same:
Declaring a new role "xml-parser" which is implemented by the avalon
version and change every use in cocoon from "parser" to "xml-parser".

and then:
a) Leaving the "parser" role as it is for compatibility and deprecating it.
b) Changing the implementation for parser, so that it actually uses the
   "xml-parser". This would result in the same interface but of course in
   the lookup of two components if a parser is required.

The advantage of b) is, that each component using the old "parser" role
automatically gets the new "xml-parser" (wrapped by the old one).

I'm +1 on a).



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