diff --git a/.github/workflows/clang-format.yml b/.github/workflows/clang-format.yml
index e3be5eb1..078402ae 100644
--- a/.github/workflows/clang-format.yml
+++ b/.github/workflows/clang-format.yml
@@ -2,9 +2,9 @@ name: Clang Format Diff
 
 on:
   push:
-    branches: [ master, fullsupport_xml]
+    branches: [ master, improve_xml]
   pull_request:
-    branches: [ master, fullsupport_xml]
+    branches: [ master, improve_xml]
     
 jobs:
   build:
diff --git a/.github/workflows/linux-clang.yml b/.github/workflows/linux-clang.yml
index e2e7f01c..401c8570 100644
--- a/.github/workflows/linux-clang.yml
+++ b/.github/workflows/linux-clang.yml
@@ -2,9 +2,9 @@ name: Ubuntu (clang)
 
 on:
   push:
-    branches: [ master, fullsupport_xml]
+    branches: [ master, improve_xml]
   pull_request:
-    branches: [ master, fullsupport_xml]
+    branches: [ master, improve_xml]
     
 jobs:
   build:
diff --git a/.github/workflows/linux-gcc.yml b/.github/workflows/linux-gcc.yml
index caaba1ef..1e0596f8 100644
--- a/.github/workflows/linux-gcc.yml
+++ b/.github/workflows/linux-gcc.yml
@@ -2,9 +2,9 @@ name: Ubuntu (gcc)
 
 on:
   push:
-    branches: [ master, fullsupport_xml]
+    branches: [ master, improve_xml]
   pull_request:
-    branches: [ master, fullsupport_xml]
+    branches: [ master, improve_xml]
     
 jobs:
   build:
diff --git a/.github/workflows/mac.yml b/.github/workflows/mac.yml
index 035f72de..c334ff00 100644
--- a/.github/workflows/mac.yml
+++ b/.github/workflows/mac.yml
@@ -2,9 +2,9 @@ name:  macOS Monterey 12
 
 on:
   push:
-    branches: [ master, fullsupport_xml]
+    branches: [ master, improve_xml]
   pull_request:
-    branches: [ master, fullsupport_xml]
+    branches: [ master, improve_xml]
     
 jobs:
   build:
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index a93d8f62..6a9583d8 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -2,9 +2,9 @@ name: Windows Server 2022
 
 on: 
   push:
-    branches: [ master, fullsupport_xml]
+    branches: [ master, improve_xml]
   pull_request:
-    branches: [ master, fullsupport_xml]
+    branches: [ master, improve_xml]
     
 jobs:
   build:
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3822a92c..b463ae1b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -53,6 +53,7 @@ set(TEST_YAML test/test_yaml.cpp test/test_yaml_bech.cpp)
 set(YAMLBENCH  benchmark/yaml_benchmark.cpp)
 set(TEST_NOTHROW test/test_yaml_nothrow.cpp)
 set(TEST_UTIL test/test_util.cpp)
+set(TEST_XMLNOTHROW test/test_xml_nothrow.cpp)
 
 add_executable(json_example 	${JSON_EXAMPLE})
 add_executable(xml_example 		${XML_EXAMPLE})
@@ -67,6 +68,7 @@ add_executable(test_yaml ${TEST_YAML})
 add_executable(yaml_benchmark ${YAMLBENCH})
 add_executable(test_nothrow ${TEST_NOTHROW})
 add_executable(test_util ${TEST_UTIL})
+add_executable(test_xml_nothrow ${TEST_XMLNOTHROW})
 
 # unit test
 option(BUILD_UNIT_TESTS "Build unit tests" ON)
@@ -91,3 +93,4 @@ add_test(NAME test_xml COMMAND test_xml)
 add_test(NAME test_yaml COMMAND test_yaml)
 add_test(NAME test_nothrow COMMAND test_nothrow)
 add_test(NAME test_util COMMAND test_util)
+add_test(NAME test_xml_nothrow COMMAND test_xml_nothrow)
diff --git a/README.md b/README.md
index e80960b1..7b3cd433 100644
--- a/README.md
+++ b/README.md
@@ -96,14 +96,10 @@ person p = {"admin", 20};
 iguana::string_stream ss;  // here use std::string is also ok
 iguana::to_xml(ss, p);
 std::cout << ss.str() << std::endl;
-// you can also call iguana::to_xml_pretty to get pretty string
-iguana::string_stream s;
-iguana::to_xml_pretty(s, p);
-std::cout << s.str() << std::endl;
 
 // deserialization the structure from the string
 std::string xml = "<?xml version=\"1.0\" encoding=\"UTF-8\">  <name>buke</name> <age>30</name>";
-iguana::from_xml(p, xml.data());
+iguana::from_xml(p, xml);
 ```
 #### Serialization of yaml
 
@@ -212,7 +208,7 @@ std::string str = R"(
 </library>
 )";
 library_t lib;
-iguana::from_xml(lib, str.data());
+iguana::from_xml(lib, str);
 ```
 #### yaml
 
diff --git a/iguana/json_writer.hpp b/iguana/json_writer.hpp
index 7dd5c770..4134f4f8 100644
--- a/iguana/json_writer.hpp
+++ b/iguana/json_writer.hpp
@@ -174,12 +174,12 @@ template <typename Stream, tuple_t T>
 IGUANA_INLINE void render_json_value(Stream &s, T &&t) {
   using U = typename std::decay_t<T>;
   s.push_back('[');
-  const size_t size = std::tuple_size_v<U>;
+  constexpr size_t size = std::tuple_size_v<U>;
   for_each(std::forward<T>(t),
            [&s, size](auto &v, auto i) IGUANA__INLINE_LAMBDA {
              render_json_value(s, v);
 
-             if (i != size - 1)
+             if (i != size - 1) [[likely]]
                s.push_back(',');
            });
   s.push_back(']');
diff --git a/iguana/xml_reader.hpp b/iguana/xml_reader.hpp
index 53488d52..0f8b1384 100644
--- a/iguana/xml_reader.hpp
+++ b/iguana/xml_reader.hpp
@@ -159,6 +159,30 @@ IGUANA_INLINE void parse_item(U &value, It &&it, It &&end,
   parse_item(value.value(), it, end, name);
 }
 
+//  /> or skip <?>、 <!> and <tag></tag> until the </name>
+//  loose inspection here
+template <typename It>
+IGUANA_INLINE void skip_object_value(It &&it, It &&end, std::string_view name) {
+  skip_till_greater(it, end);
+  ++it;
+  if (*(it - 2) == '/') {
+    // .../>
+    return;
+  }
+  // </name>
+  size_t size = name.size();
+  while (it != end) {
+    skip_till_greater(it, end);
+    if (*(it - size - 2) == '<' && *(it - size - 1) == '/' &&
+        (std::string_view{&*(it - size), size} == name)) {
+      ++it;
+      return;
+    }
+    ++it;
+  }
+  throw std::runtime_error("unclosed tag: " + std::string(name));
+}
+
 template <refletable T, typename It>
 IGUANA_INLINE void parse_item(T &value, It &&it, It &&end,
                               std::string_view name) {
@@ -241,12 +265,16 @@ IGUANA_INLINE void parse_item(T &value, It &&it, It &&end,
                 "type must be memberptr");
             using V = std::remove_reference_t<decltype(value.*member_ptr)>;
             if constexpr (!cdata_t<V>) {
-              detail::parse_item(value.*member_ptr, it, end, key);
+              parse_item(value.*member_ptr, it, end, key);
             }
           },
           member_it->second);
     } else [[unlikely]] {
+#ifdef THROW_UNKNOWN_KEY
       throw std::runtime_error("Unknown key: " + std::string(key));
+#else
+      skip_object_value(it, end, key);
+#endif
     }
     skip_sapces_and_newline(it, end);
   }
diff --git a/test/test_xml_nothrow.cpp b/test/test_xml_nothrow.cpp
new file mode 100644
index 00000000..c5941136
--- /dev/null
+++ b/test/test_xml_nothrow.cpp
@@ -0,0 +1,77 @@
+#define DOCTEST_CONFIG_IMPLEMENT
+#include "doctest.h"
+#undef THROW_UNKNOWN_KEY
+#include "iguana/xml_reader.hpp"
+#include "iguana/xml_writer.hpp"
+#include <deque>
+#include <iostream>
+#include <iterator>
+#include <list>
+#include <optional>
+#include <vector>
+
+enum class enum_status {
+  paid,
+  unpaid,
+};
+struct order_t {
+  enum_status status;
+  float total;
+};
+REFLECTION(order_t, status, total);
+
+TEST_CASE("test unkonwn key") {
+  auto validator = [](order_t od) {
+    CHECK(od.status == enum_status::unpaid);
+    CHECK(od.total == 65.0f);
+  };
+  std::string str = R"(
+<order_t>
+  <orderID>12345</orderID>
+  <status>1</status>
+  <phone />
+  <customer>
+    <firstName>John</firstName>
+    <![CDATA[ node2</p>]]>
+    <lastName>Doe</lastName>
+    <address>
+      <street>123 Main St</street>
+      <city>Anytown</city>
+      <state>CA</state>
+      <zip>12345</zip>
+    </address>
+  </customer>
+  <items>
+    <item>
+      <productID>67890</productID>
+      <name>Widget A</name>
+      <quantity>2</quantity>
+      <price>10.00</price>
+    </item>
+    <item>
+      <productID>98765</productID>
+      <name>Widget B</name>
+      <quantity>3</quantity>
+      <price>15.00</price>
+    </item>
+  </items>
+  <![CDATA[ node2</p>]]>
+  <total>65.00</total>
+</order_t>
+  )";
+  order_t od;
+  iguana::from_xml(od, str);
+  validator(od);
+
+  std::string ss;
+  iguana::to_xml(od, ss);
+  order_t od1;
+  iguana::from_xml(od1, ss);
+  validator(od1);
+}
+
+// doctest comments
+// 'function' : must be 'attribute' - see issue #182
+DOCTEST_MSVC_SUPPRESS_WARNING_WITH_PUSH(4007)
+int main(int argc, char **argv) { return doctest::Context(argc, argv).run(); }
+DOCTEST_MSVC_SUPPRESS_WARNING_POP