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6.3.2. Taxonomic fact types > Categorization fact types - Pg. 172

6.3 Fact types 151 you may prefer a person who was born earlier than 1/1/1950. While this is a common form of expression in everyday English, it poses a problem. Instead of a separate term for each attribute (e.g., birth date, height, weight) and a small set of fact types for comparing attributes (as in the previous section), we are using a verb phrase to represent the attribute. This would necessitate a separate fact type for each combination of attribute and comparison, and so is not recommended. 6.3.2 Taxonomic fact types There are two special categories of fact type which we can use to define our taxonomy of terms: 1. categorization fact types (described in Section that define a term's hypernym (the term signifying the superset of the set signified by the original term); 2. assortment fact types (described in Section that define the set to which the individual con- cept signified by a proper name belongs. Categorization fact types Many of the terms we use are hyponyms, signifying particular types of the things signified by more