digester.addSetNestedProperties(PATTERN);
SetNestedPropertiesRule rule = new SetNestedPropertiesRule();  rule.setAllowUnknownChildElements(true); digester.addRule(PATTERN, rule);
    private Digester configureDigester() {        Digester digester = new Digester();        digester.setValidating(false);        digester.setNamespaceAware(false);        digester.push(new ArrayList());        digester.addObjectCreate(PATTERN, RegistrationItem.class);        digester.addSetNestedProperties(PATTERN);        digester.addSetNext(PATTERN, "add");        return digester;    }