Before Generalization
low
Verb
will
will
6
Timeid
low
Other
pm
pm
5
low
Digit
4
4
4
<stime>
low
Prep
at
at
3
low
Noun
seminar
seminar
2
low
Art
the
the
1
Tag
SemCat
case
LexCat
lemma
word
Action
Associated information
Condition
Word index
nThe seminar at 4 pm will cover several topics
Each text is analyzed before the extraction stage. Each word is assigned with 4 features: lemma, lexical category, case and semantic category. Rules are extracted in the form of window with w words to the left, and w words to the right side of a boundary of named entity (table 1). Each rule can be presented as a table.

There are 2 steps in the training process. Initially a set of tagging rules is learned. Next stage consists of inducing metarules, which correct mistakes and imprecision in tagging process.