final TypeNode type = new TypeNodeImpl( "Person" );
final ConstraintNode c1 = new ConstraintNodeImpl( "Person",
"name",
"==",
new EnumValue( "Names.FRED" ) );
model.setRoot( type );
type.addChild( c1 );
final String drl = GuidedDecisionTreeDRLPersistence.getInstance().marshal( model );
assertEqualsIgnoreWhitespace( expected,