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The cfperl project, a cfengine interpreter written in Perl, is developed from the top down. In this article, we'll discuss the groups and classes, and how unknown input is handled. Read The road to better programming: Chapter 9. The classes and default parsers here. (http://www.opensourcetutorials.com/tutorials/Server-Side-Coding/Perl/classes-and-default-parsers/page1.html)