*/
gboolean homogeneous_types (GtkWidget *source, GtkWidget *dest);
+/* Returns TRUE if all of the variable(s) represented by the rows
+ currently selected by SOURCE widget, are numeric. DEST is ignored.
+
+ In other words, this function when passed as the argument to
+ psppire_selector_set_allow, ensures that the selector selects only
+ numeric variables.
+*/
+gboolean numeric_only (GtkWidget *source, GtkWidget *dest);
+
#endif