What is the Role of NLP in Text Retrieval?
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TL;DR
It is concluded that LMI is not needed for effective retrieval, but has other important roles within information-selection systems.
Abstract
This paper addresses the value of linguistically-motivated indexing (LMI) for document and text retrieval. After reviewing the basic concepts involved and the assumptions on which LMI is based, namely that complex index descriptions and terms are necessary, I consider past and recent research on LMI, and specifically on automated LMI via NLP. Experiments in the first phase of research, to the late eighties, did not demonstrate value in LMI, but were very limited; but the much larger tests of the Nineties, with full text, have not done so either. My conclusion is that LMI is not needed for effective retrieval, but has other important roles within information-selection systems.
