Endeca is known for the faceted search it offers. In this article, its chief scientist, Daniel Tunkeland, provides a brief description, some images, and some history.
Mainly -- "As a practical matter, the facets for a collection are typically derived either from pre-existing fields in a database (e.g., the columns in a relational database or data warehouse) or by applying information extraction techniques to unstructured content, (e.g., detecting names of people and places in free text)."
Faceted approach is most often seen at retail web sites since it is an excellent way to allow browse and search of products by brand, prices, and various attributes.
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