What's the format of "Component Load Rules" File

I create a build definition, but I just want to load some folders in a certain component.

I could see there's a place in build definition that i could specify a file for component load rules, i'm wandering what is the correct format? anyone could give me an example? many thanks

This document shows you a format sample.
http://publib.boulder.ibm.com/infocenter/clmhelp/v3r0m1/index.jsp?topic=%2Fcom.ibm.team.build.doc%2Ftopics%2Fr_scm_build_loadrules.html

I create a build definition, but I just want to load some folders in a certain component.

I could see there's a place in build definition that i could specify a file for component load rules, i'm wandering what is the correct format? anyone could give me an example? many thanks