OptionalheadingTrue when the title is a real heading of the material, not a page number or a file name.
How deep the heading is, 1 for a top heading. toRecords keeps it between 1 and 6.
The heading's text. Without a real heading it is a stand-in, such as the file name, a sheet name, a page's first line, or Slide 3.
A heading found in the material, before it gets an id.