scripting filters

[Alessandro Magni <magni inrim it>]

I am not a C/C++/C# developer, I am most fond of scripting languages - 
mostly Perl - so I feared I could do nothing but be a Beagle-user only.
Recently yet I discovered under 
http://beaglewiki.org/Supported_Filetypes that with the aid of the file 
external-filters.xml  
(http://cvs.gnome.org/viewcvs/*checkout*/beagle/Filters/external-filters.xml?rev=1.1&content-type=text%2Fplain) 
one can write simple programs in any language he likes to extract info, 
so I am very interested to start writing stuff to extend Beagle.
One question only:
these filters are used by Beagle to find info stored in my files, so 
that it can report them as found, right? How it is possible then to 
associate an "action" to execute on a particular file reported by 
beagle-search? (e.g. I wrote a filter to extract comments from Grace 
files http://plasma-gate.weizmann.ac.il/Grace/: how can I launch xmgrace 
on them?)

thanks for any info...

Alessandro

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