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キーワード:
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要旨:
The HOPI index, a connection index for XML documents based on the concept of a
2--hop cover, provides space-- and time--efficient reachability tests along the
ancestor, descendant, and link axes to support path expressions with wildcards
in XML search engines.
This paper presents enhanced algorithms for building HOPI, shows how to augment
the index with distance information, and discusses incremental index
maintenance. Our experiments show substantial improvements over the existing
divide-and-conquer algorithm for index creation, low space overhead for
including distance information in the index, and efficient updates.
