** Reading data
*** Casereaders generalities
*** Casereaders from data files
-*** Casereaders from the active file
+*** Casereaders from the active dataset
*** Other casereaders
** Writing data
*** Casewriters generally
*** Casewriters to data files
-*** Modifying the active file
-**** Modifying cases obtained from active file casereaders has no real effect
+*** Modifying the active dataset
+**** Modifying cases obtained from active dataset casereaders has no real effect
**** Transformations; procedures that transform
** Transforming data
*** Sorting and merging