Relation Extraction for Semantic Web ◾ 195
i + ii) * <arg1> * was born in * March <arg2>
ii + iii) King <arg1> * of * was born in * <arg2>
i + iii) * <arg1> * Europe * was born in * <arg2>.
However, if we want to learn the birth years of kings, Europeans, and people born
in March, we would need a pattern like <arg1> * was born in * <arg2>. is pattern
can be induced by taking all the three sentences into account, but not by generaliz-
ing occurrences only pair-wise as in URES [18]. In this sense, the mining algorithm
implemented in URES is not complete and may miss many useful patterns, thus
resulting in lower recall (recall is, however, not reported for URES). In contrast,
our approach is complete in the sense that it is guaranteed to ...