DOCBOOK-APPS: how to generate TOC listings in every section?

["Robert P. J. Day" <rpjday@mindspring.com>]

  what XSL param would i use to generate a single-level
TOC in every section, regardless of that section's level?

  that is, at the chapter level, i want to open with a TOC that
contains only the section level 1 entries.

  if i go to a level 1 section, it should start with a TOC
listing its enclosed level 2 section entries.  and so on.

rday