Ontology from Local Hierarchical Structure in Text

Details Ontology from Local Hierarchical Structure in Text Ontology from Local Hierarchical Structure in Text

2007-01-27

arxiv.org/abs/cs/0701180v1

Computer Science

Information Retrieval

35 pp., 12 figures

Scientific paper

We study the notion of hierarchy in the context of visualizing textual data and navigating text collections. A formal framework for ``hierarchy'' is given by an ultrametric topology. This provides us with a theoretical foundation for concept hierarchy creation. A major objective is {\em scalable} annotation or labeling of concept maps. Serendipitously we pursue other objectives such as deriving common word pair (and triplet) phrases, i.e., word 2- and 3-grams. We evaluate our approach using (i) a collection of texts, (ii) a single text subdivided into successive parts (for which we provide an interactive demonstrator), and (iii) a text subdivided at the sentence or line level. While detailing a generic framework, a distinguishing feature of our work is that we focus on {\em locality} of hierarchic structure in order to extract semantic information.

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