Function nested_xml

src/struct_xml/examples/main.cpp:97–105

)";

void nested_xml() {
  ListBucketResult list_bucket;
  struct_xml::from_xml(list_bucket, xml_str);

  std::string out;
  struct_xml::to_xml(list_bucket, out);

  std::cout << out << "\n";
}

struct book_t {
  std::string title;