. KNOWLEDGE-BASED MEASURES RELY ON LEXICALTION WHICH PARAPHRASES...

1998). Knowledge-based measures rely on lexical

tion which paraphrases her question, if available.

The question reformulations thus labelled by the

semantic resources such as WordNet and comprise

path length based measures (Rada et al., 1989)

users are stored in order to retrieve the same an-

swer when a given question reformulation is asked

and concept vector based measures (Qiu and Frei,

again.