> - I was pondering about an yet another extra field on images 'checksum',
>   which would store a checksum on the handle field (a suggestion of
>   Daniel). This would make it easy to check if a image was uploaded
>   already. 
I don't see any benefit. uploading a new image will brake a checksum
wha'ts the point?
scilla uses some sort of key as an authetication string to perform a
tranformation
so <mm:image number="123" template="s(45)"/> will generate something
that hides the conversion command while delaying the transformation.
checksum's can't be used for that either since the transformation must
be finished in order to calculate the checksum.
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