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Published in:
2008 | OriginalPaper | Chapter
Hierarchy Encoding with Multiple Genes
Authors : Martin van Bommel, Ping Wang
Published in: Database and Expert Systems Applications
Publisher: Springer Berlin Heidelberg
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Efficient implementation of type inclusion testing is important for data and knowledge base systems employing large hierarchies. The bit vector encoding of a partially ordered set representing a type hierarchy permits constant-time type inclusion testing. Current such methods employ a simple encoding, associating a single gene for each join-irreducible element. We present an algorithm using multiple genes for those elements with many siblings. The new algorithm provides a significant improvement on the encoding size for hierarchies with low multiple inheritance factors.