Title of a toc, when toc is generated at a user-specified position

[Erik Leunissen <e.leunissen@hccnet.nl>]

When choosing to place the TOC of a book after the book's preface, it 
appears that one loses[*] the TOC's generated title as a side-effect. 
That is, when following the recipe in this URL:

  https://lists.oasis-open.org/archives/docbook-apps/200705/msg00023.html

What's the best approach to make this TOC have a title nonetheless?

Thanks in advance,

Erik Leunissen (xsltproc - fop1.1 -> pdf)
--

[1] Adding a title to toc in the xml source makes the toc element 
non-empty, which effectively disables the "process.empty.source.toc" 
parameter.