(FUNCTION ARG1 ARG2 ... )
-When it is applied, then FUNCTION is called as follows
+When the markup is formatted, then FUNCTION is called as follows
(FUNCTION GROB PROPS ARG1 ARG2 ... )
+GROB is the current grob, PROPS is a list of alists, and ARG1.. are
+the rest of the arguments.
+
The function should return a molecule (i.e. a formatted, ready to
print object).
+
+
To add a function,
1. It should be named COMMAND-markup
(set-object-property! COMMAND-markup scm0-markup1)
+(insert in the list below).
+
3. The command is now available in markup mode, e.g.