From: Snjezana Sevo-Zenzerovic <snjezana.sevozenzerovic_at_oracle.com>
Date: Wed, 10 Aug 2011 11:54:27 -0700 (PDT)

FWIW, the difference between "dirs" and "dirtrees" sections are that "dirs" includes only specified directories (without any content) into IPS package and "dirtrees" will also include directory content...