When the toplevel header is given the scope property OurBigBook automatically uses the file path for the scope and heaves fragments untouched.
For example, suppose that file full-and-unique-experiment-name contains:
= Full and unique experiment name

== Introduction

== Materials
In this case, multi-file output will generate a file called full-and-unique-experiment-name.html, and the URL of the subsections will be just:
  • full-and-unique-experiment-name.html#introduction
  • full-and-unique-experiment-name.html#materials
instead of
  • full-and-unique-experiment-name.html#full-and-unique-experiment-name/introduction
  • full-and-unique-experiment-name.html#full-and-unique-experiment-name/materials
Some quick interactive cross file link tests: