Getting section numbering via Action code

Export code includes a code ^sectionNumber^ which gives output like this 2.6.2.3.44. It is effectively a chaining all the $SiblingOrder values for ancestors and that of the current note.

This can be achieved in action code but is somewhat inelegant as root level notes require a different handling and action code conditionals require a full expression inside the branch. This code sets $MyString to the section number of the current object:

$MyString = if($OutlineDepth >1){
   collect(ancestor,$SiblingOrder).reverse.format(".")+"."+$SiblingOrder;
}else{
   $SiblingOrder
};

Or, in one-line form:

$MyString = if($OutlineDepth >1){collect(ancestor,$SiblingOrder).reverse.format(".")+"."+$SiblingOrder;}else{$SiblingOrder};

Other approaches

There are several ways to number (parts of) a document whether internally or (only) for export. These techniques use one or both of two user attributes:

The technique uses two user attributes:

$Section. String-type.
$IsTop. Boolean-type. Regardless of where in the outline the 'top' or root note of the numbered sections needs to have $IsTop set to true.

The techniques are: