deleteUsers static method
XML for the deleteUsers
Implementation
static XmlDocumentFragment deleteUsers(List<String> userNames) {
  builder.element(
    'DeleteUsers',
    nest: () {
      builder.namespace(Xmlns.tds);
      for (var userName in userNames) {
        userName.buildXml(builder, tag: 'Username');
      }
    },
  );
  return builder.buildFragment();
}