G.
Marchionini, UNC-CH
Text Retrieval
1. Text retrieval is more
complex than data retrieval from DBMS.
2. Distinguish searching
for word matches from concept matches.
3. Distinguish subject
from keyword search:
Subject:-->Search on a
controlled vocabulary (e.g., LC subject headings). The
results point to documents.
Keyword-->Search all words in
particular fields/text fragments. The results point to documents.
4. Distinguish exact
match from partial match (ranked) retrieval
5. Distinguish
ASCII/UNICODE objects from bit maps