3.3 TE recognition
We define a question focus as a type of informa-
tion that a user wants to know. For example, in
In the TE identification phase, pre-defined words,
the question What movies will be shown on TV
phrases, and named entities are identified as slot-
tonight?
, the question focus is a program title, or
filler candidates for appropriate slots, according to
titles. For another example, the question focus is
TE tagging rules. For instance, movie and NBC
a current rainfall in a question San Francisco is
are tagged as Genre and Channel in the sample
raining now, is it raining in Los Angeles too?
.
question Tell me the movie on NBC tonight.
(i.e.
To find the question focus, we define question
movie will be used to fill Genre slot and NBC
focus region, a part of a question that may contain
will be used to fill Channel slot in a semantic
clues for deciding the question focus. The ques-
frame). The hand-crafted TE tagging rules basi-
tion focus region is identified with a set of simple
cally consider the surface form and the concept
rules which consider the characteristic of the Ko-
name (derived from domain ontologies) of a target
rean interrogatives. Generally, the question focus
word. The context surrounding the target word or
region has a fixed pattern that is typically used in
word dependency information is also considered
interrogative questions(Akiba et al., 2002). Thus
in some cases. In the example question of Figure
a small number of simple rules is enough to cover
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