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entry in the list defining B and PT as equivalent stem endings if the preceding characters match
...The assumption in the context of IR is that if two words have the same underlying stem then they refer to the same concept and should be indexed as such
...It is inevitable that a processing system such as this will produce errors
...My description of the three stages has been deliberately undetailed,only the underlying mechanism has been explained
...Surprisingly,this kind of algorithm is not core limited but limited instead by its processing time
...The final output from a conflation algorithm is a set of classes,one for each stem detected
...Queries are of course treated in the same way
...Indexing An index language is the language used to describe documents and requests
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searching
...One last distinction,the vocabulary of an index language may be controlled or uncontrolled
...The index language which comes out of the conflation algorithm in the previous section may be described as uncontrolled,post coordinate and derived
...There is much controversy about the kind of index language which is best for document retrieval
...Probably the most substantial evidence for automatic indexing has come out of the SMART Project 1966
...The document representatives used by the SMART project are more sophisticated than just the lists of stems extracted by conflation
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