30th European Conference on Information Retrieval (ECIR 2008), Glasgow, United Kingdom, 30 March - 03 April 2008, vol.4956, pp.695-699
We show that a cluster-skipping inverted index (CS-IIS) is a practical and efficient file structure to support category-restricted queries for searching Web directories. The query processing strategy with CS-IIS improves CPU time efficiency without imposing any limitations on the directory size.