Using DemeterF on CCIS machines:

add: /home/chadwick/www/Traversal/package.jar
to your class path.

DemeterF can be used with any Java program.
But it is nice to use it in conjunction
with a code generator, such as DemeterJ:

Put: into your .cd file:
import edu.neu.ccs.demeterf.*;

About using DemeterF:

// to say that Node is a builtIn class
    edu.neu.ccs.demeterf.util.Util.addBuiltIn(Node.class);

// for debugging traversals
    edu.neu.ccs.demeterf.util.Util.setDebug(true);

Unless you use update methods (IDa), apply methods only take
one argument. This is different from the update methods
of IDb that collect information from subtraversals
and send them up the object. The update methods 
need the full context of what is returned from the subobjects.