label.from.part — Renumber components in each part?
If label.from.part is non-zero, then
numbering of components — preface,
chapter, appendix, and
reference (when reference occurs at the
component level) — is re-started within each
part.
If label.from.part is zero (the
default), numbering of components is not
re-started within each part; instead, components are
numbered sequentially throughout each book,
regardless of whether or not they occur within part
instances.