--- /dev/null
+
+* add param node in the TML with the name of the parameter
+* add space node? active node?
+* add alt boolean to all deleting methods
+* implement a mechanism that allows the definition of new macros
+* add open-group close-group attributes in the dictionary and handle them
+* implement macro completion
+
+BUGS
+* $1\over{2}$ does not work
+
+* compare pure_subst/pure_diff/subst_diff performances
+