The bin directory contains any summarizers and any other program needed by the summarizers or by the presentation unnesting steps. The data directory contains the Gatherer's database which gatherd exports. The gatherd.cf file is used to support access control as described in Section 4.7.4 . The gatherd.log file is where the gatherd program logs its information. The lib directory contains the configuration files used by the Gatherer's subsystems, namely Essence.
Extracts attributes for summarizing step.
We discuss each of the customizable steps in the subsections below.