Appending to a collection, merging collections, or just "restoring" db-files

Hi!

Are these steps sufficient to restore the db-files or as a way to  
append images to a collection? (Or merge two collections, or whatever):

1. Create a bunch of .fts files in $GIFT_HOME/gift-indexing-data/ 
collectionName/, using gift-extract-features. (and a heap of ppm images)

2. If InvertedFileFeatureDescription.db is okay, we SHOULD be able to  
use it!? Or we create a new by doing something magic like:
cat arbitraryPpmImage.ppm | gift-write-feature-descs | perl -ne  
'print join(" ",(split(" ",$_))[0..1]),"\n";' >  
InvertedFileFeatureDescription.db

3. recreate a url2fts.xml, with paths to all the .fts files we want  
to use, and some path to thumbnails and images (for the server to use  
when presenting its results). A quick perl hack will do this easily.

4. Run "gift-generate-inverted-file $GIFT_HOME/gift-indexing-data/ 
collectionName/" to recreate InvertedFile.db and  
InvertedFileOffset.db (using the url2fts.xml file)

5. Restart the running gift server.


Something similar to this appeared to work when I was experimenting  
with the GIFT a while back, but I haven't tried it properly lately.

What do you say? Have I missed some important steps, or have I  
misunderstood something?



/Jonas

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