//add a rule on stem:a saying if you are added to a group in the stem by a new paths (flattened), then send an email
    AttributeAssign attributeAssign = ruleStem
      .getAttributeDelegate().addAttribute(RuleUtils.ruleAttributeDefName()).getAttributeAssign();

    attributeAssign.getAttributeValueDelegate().assignValue(
        RuleUtils.ruleActAsSubjectSourceIdName(),actAsSubject.getSourceId());
    attributeAssign.getAttributeValueDelegate().assignValue(
        RuleUtils.ruleActAsSubjectIdName(), actAsSubject.getId());
    attributeAssign.getAttributeValueDelegate().assignValue(
        RuleUtils.ruleCheckTypeName(),
        RuleCheckType.flattenedMembershipAddInFolder.name());
    attributeAssign.getAttributeValueDelegate().assignValue(
        RuleUtils.ruleCheckStemScopeName(),
        Stem.Scope.SUB.name());
    attributeAssign.getAttributeValueDelegate().assignValue(
        RuleUtils.ruleThenEnumName(), RuleThenEnum.sendEmail.name());
    attributeAssign.getAttributeValueDelegate().assignValue(
        RuleUtils.ruleThenEnumArg0Name(), emailToValue);
    //the to, subject, or body could be text with EL variables, or could be a template.  If template, it is
    //read from the classpath from package: grouperRulesEmailTemplates/theTemplateName.txt
    //or you could configure grouper.properties to keep them in an external folder, not in the classpath
    attributeAssign.getAttributeValueDelegate().assignValue(
        RuleUtils.ruleThenEnumArg1Name(), emailSubjectValue);

    attributeAssign.getAttributeValueDelegate().assignValue(
        RuleUtils.ruleThenEnumArg2Name(), emailBodyValue);

    //should be valid
    String isValidString = attributeAssign.getAttributeValueDelegate().retrieveValueString(
        RuleUtils.ruleValidName());
    if (\!StringUtils.equals("T", isValidString)) {
      throw new RuntimeException(isValidString);
    }