A Simplified Model for Facet Analysis
http://iainstitute.org/en/learn/research/a_simplified_model_for_facet_analysis.php

Spiteri, Louise
Information Architecture Institute
1998

Abstract:

Classification systems such as the Dewey Decimal Classification (DDC) and the Library of Congress Classification (LCC) attempt to enumerate topics expressed in published works. Such enumerative systems do not allow easily for the combination of terms from different parts of the classification schedules to express compound subjects.