provides attributes for referencing locations by pointing to entries in a canonical list of places. indicates one or more locations by pointing to a place element or other canonical description. indique une ou plusieurs localisations en pointant vers un élément place ou autre description canonique. indica una o más localizaciónes señalando un elemento place u otra descripción canónica. indica una o più posizioni facendo riferimento a un elemento place o altra descrizione canonica.