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Specification of a partial/total ordering of attributes explicitly at the schema level by users or expertsstreet < city < state < countrySpecification of a hierarchy for a set of values by explicit data grouping{Urbana, Champaign, Chicago} < IllinoisSpecification of only a partial set of attributesE.g., only street < city, not othersAutomatic generation of hierarchies (or attribute levels) by the analysis of the number of distinct valuesE.g., for a set of attributes: {street, city, state, country}
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