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From "Vadim Gritsenko" <vadim.gritse...@verizon.net>
Subject FW: How to define custom parameter for map:serialize?
Date Fri, 08 Mar 2002 15:49:51 GMT
Hi Cocoon Devs,

Can somebody recommend the best way to deal with the issue? The problem
is that <map:serialize/> does not allow parameters and the question is
how to live without it. See corresponding thread on the user list.

Should we add support for cache-aware serializers implementing
SitemapModelComponent?

Thanks,
Vadim

> -----Original Message-----
> From: Stefan Seifert [mailto:sseifert@pro-vision.de]
> Sent: Friday, March 08, 2002 10:32 AM
> To: cocoon-users@xml.apache.org
> Subject: AW: How to define custom parameter for map:serialize?
> 
> No, output ist RTF. No, before you ask: we cannot use FOP and the
> builtin RTF Serializer because we have some special requirements not
> supported by FOP (i.e. automatic line numbering which is supported by
> Word/RTF, but not in FOP).
> 
> Seeing your answers i'm thinking about another way, that seems quite
> hacked for me: Writing a transformer that uses the incoming data and
our
> Template, puts all generated RTF in one huge single XML Element and  a
> custom serializer "serializes" this without changes as text output.
> 
> Is this the cleanest solution in Cocoon??
> 
> Stefan
> 
> > -----Ursprüngliche Nachricht-----
> > Von: Vadim Gritsenko [mailto:vadim.gritsenko@verizon.net]
> > Gesendet: Freitag, 8. März 2002 16:17
> > An: cocoon-users@xml.apache.org
> > Betreff: RE: How to define custom parameter for map:serialize?
> >
> >
> > > From: Stefan Seifert [mailto:sseifert@pro-vision.de]
> > >
> > > <snip/>
> > >
> > > > This was discussed several times and the result is: "serializers
> > > > must be
> > > > unaware of environment they running in and always produce same
> > > > response
> > > > independent of environment state". IIRC, this has to do with the
> > > > caching. Implement custom transformer if you want, it can have
> > > > parameters.
> > >
> > > The problem is we have written a "template-based" serializer. The
> > > pipeline generates the data, and the serializer uses the
> > > template and the date to produce the output.
> >
> > Is output in XML format? (HTML?). If yes, than your serializer is
> > perfect candidate for transformer.
> >
> >
> > > The template is unfortunately not in
> > > XML-Format, so it cannot be processed in the pipeline.
> >
> > It is Ok, it is not required to be XML (see above).
> >
> >
> > > Instead the
> > > template filename should be passed as parameter to the serializer.
> > >
> > > If caching is the only reason for not being able to allow
> > > pipeline-dependent parameters - in this case it would be
> > > simple to not use the caching (i.e. do not implementing the
> > > Cachable-Interface) for
> > > this special serializer and there should be no problem with
caching.
> > >
> > > In the existing C2 architecture the lack of pipeline-dependent
> > > parameters is quite limiting.
> >
> > You can try and open the discussion on the dev list.
> >
> >
> >
> > > Now the only solution is to put the template parameter in the XML
> > > stream to "parameterize" the serializer (but this is mixing 
> > > of content and formatting information) or to fix it in the 
> > > serializer definition and
> > > duplicate the serializer for each different parameter which is
even
> > > worse (and it would be not possible to get the parameter
definition
> > > from a database or other source).
> >
> > Or to write a transformer. Clean and (btw) cacheable solution.
> >
> >
> > > Patching cocoon for our needs in this case is no option either,
> > > because this would change interfaces "in the heart" of the 
> > > pipeline processing and we would not be able to upgrade
> > > to future cocoon-versions without problems.
> > >
> > > I think a lot of other serializers would benefit from
> > > pipeline-dependent parameters, too, i.e. the compressing 
> > > factor/background color of the svg
> > > serializer or the doctype of the HTML serializer (just think of
the
> > > problems of some Netcape 6 version with some special doctype
> > > definitions).
> > >
> > > Stefan



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