US Patent 11126633 Multifaceted search with facet hierarchy

A search system configured to determine, according to a facet hierarchy definition, a facet hierarchy for a set of search results, the facet hierarchy comprising a plurality of facet topics represented by a set of search results. The search is further configured to generate a search user interface comprising a facet hierarchy interface configured to display a representation of the facet hierarchy in conjunction with results from a set of results, update the search results display to display faceted search results and update the facet hierarchy interface to display, in conjunction with the faceted search results, a control to allow a user to select a search facet topic where the search facet topic is a facet topic from the facet hierarchy that is not represented in the faceted search results.