code: function(oExtension, $Cell, aDefaultLabels, aDefaultDescriptions) {
  			oExtension._cleanupInfo = {
  				cell: $Cell,
  				attr: {
  					"aria-labelledby": aDefaultLabels && aDefaultLabels.length ? aDefaultLabels.join(" ") : null,
  					"aria-describedby": aDefaultDescriptions && aDefaultDescriptions.length ? aDefaultDescriptions.join(" ") : null
  				}
  			};
  		}
docs: /*
  Stores the defaults before modifications of a cell for later cleanup
  @see ExtensionHelper.cleanupCellModifications