@incollection{Keim2008Xtree-5759,
  year={2008},
  title={X-tree},
  publisher={Springer},
  address={New York},
  booktitle={Encyclopedia of GIS},
  pages={543--547},
  editor={Shekhar, Shashi},
  author={Keim, Daniel A. and Bustos Cárdenas, Benjamin Eugenio and Berchtold, Stefan and Kriegel, Hans-Peter}
}

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    <dcterms:bibliographicCitation>First publ. in: Encyclopedia of GIS / Shashi Shekhar ... (eds.). New York: Springer, 2008, pp. 543-547</dcterms:bibliographicCitation>
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    <dc:contributor>Kriegel, Hans-Peter</dc:contributor>
    <dc:contributor>Berchtold, Stefan</dc:contributor>
    <dc:creator>Keim, Daniel A.</dc:creator>
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    <dcterms:title>X-tree</dcterms:title>
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    <dcterms:abstract xml:lang="eng">The X-tree (eXtended node tree) [1] is a spatial access method [2] that supports efficient query processing for high-dimensional data. It supports not only point data but also extended spatial data. The X-tree provides overlap-free split whenever it is possible without allowing the tree to degenerate; otherwise, the X-tree uses extended variable size directory nodes, so-called supernodes. The X-tree may be seen as a hybrid of a linear array-like and a hierarchical R-tree-like directory.</dcterms:abstract>
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