Facettejen

Facettejen is a term used in information retrieval and user interface design to denote the facet service, a modular component that manages the definition, calculation, and application of facets within search and navigation interfaces. In faceted search, facets are filterable attributes such as category, price range, or author. The facettejen provides the definitions of available facets, computes counts for each facet value by querying the index, and applies user-selected facet constraints to refine result sets.

Its core responsibilities include integrating with the indexing layer to obtain up-to-date facet counts, supporting dynamic facets that can be added or removed without redeploying the UI, handling different facet types (categorical, numeric, hierarchical), enabling multi-select filtering, and exposing APIs for frontend components. It often caches facet counts to improve responsiveness and reconciles facet values with localized labels.

Contexts of use include e-commerce catalogs, digital libraries, media repositories, and enterprise search. Data model components commonly include facet definitions, facet values, counts, and applied filters; facets may be hierarchical or numeric. When a user selects a facet, the service recalculates the result set and updates counts for remaining facets to reflect the narrowed results.

See also faceted search, information retrieval, taxonomy services.