Comment.m : routine with comments but no commands

The routine Comment.m has most of the rules for comments and tags.

samples/M/Comment.m

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+Comment ;
+  ; this is a comment block
+  ; comments always start with a semicolon
+  ; the next line, while not a comment, is a legal blank line
+  
+  ;whitespace alone is a valid line in a routine
+  ;** Comments can have any graphic character, but no "control"
+  ;** characters
+  
+  ;graphic characters such as: !@#$%^&*()_+=-{}[]|\:"?/>.<,
+  ;the space character is considered a graphic character, even 
+  ;though you can't see it.
+  ; ASCII characters whose numeric code is above 128 and below 32
+  ; are NOT allowed on a line in a routine.
+  ;; multiple semicolons are okay
+  ; a line that has a tag must have whitespace after the tag, bug
+  ; does not have to have a comment or a command on it
+Tag1  
+  ;
+  ;Tags can start with % or an uppercase or lowercase alphabetic
+  ; or can be a series of numeric characters
+%HELO ;
+ ;
+0123 ;
+  ;
+%987  ;
+  ; the most common label is uppercase alphabetic
+LABEL ;
+  ; 
+  ; Tags can be followed directly by an open parenthesis and a
+  ; formal list of variables, and a close parenthesis
+ANOTHER(X) ;
+  ;
+  ;Normally, a subroutine would be ended by a QUIT command, but we
+  ; are taking advantage of the rule that the END of routine is an
+  ; implicit QUIT