Bottom-up

In this action based approach, notes look upward for seeding section numbering.

Code

if($IsTop) {
     $Section="";
} else {
    $Section = $Section(parent);
    if ($Section) {$Section+=". ";}
    $Section += $SiblingOrder;
}; 

Logic

• If you are the top, you do not have a $Section number.
• Otherwise:
  • Start by getting the parent’s $Section value
  • If that value is not empty, add a period
  • Then add your sibling number and set as $Section

Pros and Cons

• GOOD:
  • Stays up to date as the TBX is reorganised
  • Simple
  • Individual notes can choose to behave differently
• BAD:
  • Can fall a few seconds behind setting $Section in big/complex TBXs.
  • Might be a bad choice for huge outlines (thousands of elements)
  • If individual notes behave differently today, that might not be wanted tomorrow.