If what you need is a string edit distance (a kind of diff tool),
then a good introduction, theoretical, practical and didactic,
can be found here:
you will also find a couple of links.
Some (unix-like) c code can be downloaded here:
Such generic metrics are likely to be applied on any material
(tokens, part-of.speech, word-sense).
HUG - Medical Informatics Division
CH-1211 Geneva 14
tel.: (+41 22) 372 61 64
fax: (+41 22) 372 48 55
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