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-<html>
-<head>
-<title>Taxonomy of Categories</title>
-</head>
-<body>
- <h1>Taxonomy of Categories</h1>
-
- Facets are defined using a hierarchy of categories, known as a
- <i>Taxonomy</i>
-
- <br>
- For example, in a book store application, a Taxonomy could have the
- following hierarchy:
- <p>
- <ul>
- <li>Author</li>
- <ul>
- <li>Mark Twain</li>
- <li>J. K. Rowling</li>
- </ul>
- </ul>
- <ul>
- <li>Date</li>
- <ul>
- <li>2010</li>
- <li>2009</li>
- </ul>
- </ul>
-
- The <i>Taxonomy</i> translates category-paths into category-ordinal and vice versa.
-</body>
-</html>
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