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[bond at cslab.kecl.ntt.co.jp]

G'day,

this is a very basic question, but I couldn't find the answer in
"Implementing Typed Feature Structure Grammars".  If it is there and I
missed it, please forgive me and add it to the index!

What is the diffence between ":<" and ":="?

Looking at their use (in for example JACY's values.tdl): 

Things subsumed by two or more types tend to be ":=", while things
subsumed by only one type tend to be ":<".  But sometimes things
subsumed by only one type are ":=" ...

Searching on-line I found that ":<" means "is a subsort".  Practically,
how is this different from "is subsumed by"?

Getting back to basics,


-- 
Francis Bond  <www.kecl.ntt.co.jp/icl/mtg/members/bond/>
NTT Communication Science Laboratories | Machine Translation Research Group