Customise scoring

[Max S <ma...@googlemail.com>]

Hi all,

I'm have installed / imported a XML and EXIF parser plugin into Nutch to
parse xml files and EXIF metadata from JPG images. 

The idea would be to:
1. Fetch and extract data and links from XML file
	NB: The XML file contains Geo coordinates (latitude and longitude),
title and image links. 
2. Fetch image and extract EXIF metadata 3. Store the extracted data from
both parser in Index. 

I would like to customise search so the results is ordered by the following
priority.
1. Proximity to location
2. Keywords from EXIF Metadata
3. Kewords from XML title

>From what I can see at the moment, I will need to 
1. Set a higher score to the fields according to the priority above 
2. Repurpose the algorithm within GeoPosition plugin
(http://wiki.apache.org/nutch/GeoPosition)
3. Update ScoringFilter logic to include Geo Position algorithm?


Question, is the last item correct? Or are there any other approach? 
Where should I start looking? Appreciate any suggestions.

Regards
Max S