@article{Leidner-2004:JoLLI, author = "Jochen L. Leidner", title = "Review of Pa{\c s}ca (2003), Open-Domain Question Answering from Large Text Collections", year = "2004", journal = "Journal of Logic, Language and Information", volume = "13", issue = "3", pages = "373--376", abstract = "The book is structured as follows: Chapter 1 gives a brief introduction into the problem to be solved and the question answering track of the TREC Conference, in which the proposed approach was evaluated. Chapter 2 outlines the approach to open-domain question answering advocated by \pasca{}. Chapter 3 describes a layered, relational approach to question processing. Chapter 4 is concerned with how to determine the expected answer type for a question under consideration. Chapter 5 deals with the passage retrieval back-end and the notion of loops to adjust query granularity dynamically. Chapter 6 describes answer extraction as question-driven passage ranking task and compares a heuristic with a neural network based machine-learning approach. Chapter 7 is concerned with the differences between searching an offline text collection and WWW question answering. Chapter 8 mentions related work and Chapter 9 concludes the book.", uuid = "c4de074a-c703-407b-944c-995fafa803de", original = "", }