code: function (sKey) {
  			var aFiltered = FilterProcessor.apply([sKey], oCombinedFilter, function(vRef, sPath) {
  				var oContext = that.oModel.getContext('/' + vRef);
  				return that.oModel.getProperty(sPath, oContext);
  			});
  			return aFiltered.length > 0;
  		}
docs: filter function for recursive filtering, checks if a single key matches the filters