HashMap<String, Object> verbs = new HashMap<String, Object>();
verbs.put( "1", "gyre" );
verbs.put( "2", "gimble" );
MultiVariableExpander expander = new MultiVariableExpander();
expander.addSource( "noun", nouns );
expander.addSource( "verb", verbs );
digester.setSubstitutor( new VariableSubstitutor( expander ) );
digester.addObjectCreate( "root", SimpleTestBean.class );
digester.addCallMethod( "root", "setAlpha", 0 );