Package pkg = builder.getPackage();
ReteooRuleBase ruleBase = (ReteooRuleBase) RuleBaseFactory.newRuleBase(RuleBase.RETEOO);
ruleBase.addPackage(pkg);
final ReteooVisitor visitor = new ReteooVisitor( graph );
visitor.visit( ruleBase );
BaseVertex root = visitor.getRootVertex();
return root;
}