process.source.toc
 — Process a non-empty toc element if it occurs in a source document?
Specifies that the contents of a non-empty "hard-coded"
toc element in a source document are processed to
generate a TOC in output.
This parameter has no effect on automated generation of
  TOCs. An automated TOC may still be generated along with the
  "hard-coded" TOC. To suppress automated TOC generation, adjust the
  value of the generate.toc paramameter.
The process.source.toc parameter also has
  no effect if the toc element is empty; handling
  for empty toc is controlled by the
  process.empty.source.toc parameter.