1cdf8355_s_of_a_Faceted_Navigation_OPAC__Logical_Rule
[Coded Action] Remove Facet [Explanation] Removes a facet from the search (either by clicking the “X” in the interface, or by clicking the “back” button in the browser) [Logical Rule] 
Determined by counting the number of concatenated facet ids in N value. If present count is less than previous count, then this condition applies
The Code4Lib Journal – Extracting User Interaction Information from the Transaction Logs of a Faceted Navigation OPAC