process.empty.source.toc — Generate automated TOC if toc element occurs in a source document?
Specifies that if an empty toc element is found in a
source document, an automated TOC is generated at this point in the
document.
Depending on what the value of the
generate.toc parameter is, setting this
parameter to 1 could result in generation of
duplicate automated TOCs. So the
process.empty.source.toc is primarily useful
as an "override": by placing an empty toc in your
document and setting this parameter to 1, you can
force a TOC to be generated even if generate.toc
says not to.