diff --git a/sprout/ctype/ascii.hpp b/sprout/ctype/ascii.hpp
index cc39bdc1..80a317d0 100644
--- a/sprout/ctype/ascii.hpp
+++ b/sprout/ctype/ascii.hpp
@@ -231,11 +231,11 @@ namespace sprout {
 		} \
 		inline SPROUT_CONSTEXPR CHAR_TYPE \
 		SPROUT_PP_CAT(to, SPROUT_PP_CAT(PREFIX, lower))(CHAR_TYPE c) { \
-			return sprout::ascii::detail::get_value(c) & sprout::ascii::detail::lower ? c + (0x61 - 0x41) : c; \
+			return sprout::ascii::detail::get_value(c) & sprout::ascii::detail::upper ? c + (0x61 - 0x41) : c; \
 		} \
 		inline SPROUT_CONSTEXPR CHAR_TYPE \
 		SPROUT_PP_CAT(to, SPROUT_PP_CAT(PREFIX, upper))(CHAR_TYPE c) { \
-			return sprout::ascii::detail::get_value(c) & sprout::ascii::detail::upper ? c - (0x61 - 0x41) : c; \
+			return sprout::ascii::detail::get_value(c) & sprout::ascii::detail::lower ? c - (0x61 - 0x41) : c; \
 		} \
 		inline SPROUT_CONSTEXPR bool \
 		SPROUT_PP_CAT(is, SPROUT_PP_CAT(PREFIX, classified))(sprout::ctypes::mask_t m, CHAR_TYPE c) { \
diff --git a/sprout/ctype/functor.hpp b/sprout/ctype/functor.hpp
index 50b73238..3591292c 100644
--- a/sprout/ctype/functor.hpp
+++ b/sprout/ctype/functor.hpp
@@ -4,6 +4,7 @@
 #include <sprout/config.hpp>
 #include <sprout/ctype/mask.hpp>
 #include <sprout/ctype/ascii.hpp>
+#include <sprout/utility/forward.hpp>
 
 namespace sprout {
 	namespace ctypes {
@@ -402,6 +403,58 @@ namespace sprout {
 				return sprout::ctypes::is_classified<T>(m_)(x);
 			}
 		};
+
+		//
+		// nocase_equal_to
+		//
+		template<typename T = void>
+		struct nocase_equal_to {
+		public:
+			typedef T first_argument_type;
+			typedef T second_argument_type;
+			typedef bool result_type;
+		public:
+			SPROUT_CONSTEXPR bool operator()(T const& x, T const& y) const {
+					return sprout::tolower(x) == sprout::tolower(y);
+			}
+		};
+		template<>
+		struct nocase_equal_to<void> {
+		public:
+			template<typename T, typename U>
+			SPROUT_CONSTEXPR decltype(sprout::tolower(std::declval<T>()) == sprout::tolower(std::declval<U>()))
+			operator()(T&& x, U&& y)
+			const SPROUT_NOEXCEPT_EXPR(SPROUT_NOEXCEPT_EXPR(sprout::tolower(std::declval<T>()) == sprout::tolower(std::declval<U>())))
+			{
+				return sprout::tolower(sprout::forward<T>(x)) == sprout::tolower(sprout::forward<U>(y));
+			}
+		};
+
+		//
+		// nocase_not_equal_to
+		//
+		template<typename T = void>
+		struct nocase_not_equal_to {
+		public:
+			typedef T first_argument_type;
+			typedef T second_argument_type;
+			typedef bool result_type;
+		public:
+			SPROUT_CONSTEXPR bool operator()(T const& x, T const& y) const {
+					return sprout::tolower(x) != sprout::tolower(y);
+			}
+		};
+		template<>
+		struct nocase_not_equal_to<void> {
+		public:
+			template<typename T, typename U>
+			SPROUT_CONSTEXPR decltype(sprout::tolower(std::declval<T>()) != sprout::tolower(std::declval<U>()))
+			operator()(T&& x, U&& y)
+			const SPROUT_NOEXCEPT_EXPR(SPROUT_NOEXCEPT_EXPR(sprout::tolower(std::declval<T>()) != sprout::tolower(std::declval<U>())))
+			{
+				return sprout::tolower(sprout::forward<T>(x)) != sprout::tolower(sprout::forward<U>(y));
+			}
+		};
 	}	// namespace ctypes
 }	// namespace sprout
 
diff --git a/sprout/uuid.hpp b/sprout/uuid.hpp
index dbca076b..1730c640 100644
--- a/sprout/uuid.hpp
+++ b/sprout/uuid.hpp
@@ -7,6 +7,7 @@
 #include <sprout/uuid/hash.hpp>
 #include <sprout/uuid/tuple.hpp>
 #include <sprout/uuid/generators.hpp>
+#include <sprout/uuid/namespaces.hpp>
 #include <sprout/uuid/udl.hpp>
 
 #endif	// #ifndef SPROUT_UUID_HPP
diff --git a/sprout/uuid/md5_name_generator.hpp b/sprout/uuid/md5_name_generator.hpp
index 1f5c7413..bd3a873c 100644
--- a/sprout/uuid/md5_name_generator.hpp
+++ b/sprout/uuid/md5_name_generator.hpp
@@ -4,6 +4,7 @@
 #include <sprout/config.hpp>
 #include <sprout/string.hpp>
 #include <sprout/uuid/uuid.hpp>
+#include <sprout/uuid/namespaces.hpp>
 #include <sprout/checksum/md5.hpp>
 
 namespace sprout {
@@ -66,6 +67,85 @@ namespace sprout {
 				return sha_to_uuid(sum_.process_bytes(name, sprout::char_traits<char32_t>::length(name)));
 			}
 		};
+
+		//
+		// make_uuid3
+		//
+		template<typename Elem, std::size_t N, typename Traits>
+		inline SPROUT_CONSTEXPR sprout::uuids::uuid
+		make_uuid3(sprout::basic_string<Elem, N, Traits> const& name) {
+			return sprout::uuids::md5_name_generator()(name);
+		}
+		inline SPROUT_CONSTEXPR sprout::uuids::uuid
+		make_uuid3(char const* name) {
+			return sprout::uuids::md5_name_generator()(name);
+		}
+		inline SPROUT_CONSTEXPR sprout::uuids::uuid
+		make_uuid3(wchar_t const* name) {
+			return sprout::uuids::md5_name_generator()(name);
+		}
+		inline SPROUT_CONSTEXPR sprout::uuids::uuid
+		make_uuid3(char16_t const* name) {
+			return sprout::uuids::md5_name_generator()(name);
+		}
+		inline SPROUT_CONSTEXPR sprout::uuids::uuid
+		make_uuid3(char32_t const* name) {
+			return sprout::uuids::md5_name_generator()(name);
+		}
+
+		template<typename Elem, std::size_t N, typename Traits>
+		inline SPROUT_CONSTEXPR sprout::uuids::uuid
+		make_uuid3(sprout::uuids::uuid const& namespace_uuid, sprout::basic_string<Elem, N, Traits> const& name) {
+			return sprout::uuids::md5_name_generator(namespace_uuid)(name);
+		}
+		inline SPROUT_CONSTEXPR sprout::uuids::uuid
+		make_uuid3(sprout::uuids::uuid const& namespace_uuid, char const* name) {
+			return sprout::uuids::md5_name_generator(namespace_uuid)(name);
+		}
+		inline SPROUT_CONSTEXPR sprout::uuids::uuid
+		make_uuid3(sprout::uuids::uuid const& namespace_uuid, wchar_t const* name) {
+			return sprout::uuids::md5_name_generator(namespace_uuid)(name);
+		}
+		inline SPROUT_CONSTEXPR sprout::uuids::uuid
+		make_uuid3(sprout::uuids::uuid const& namespace_uuid, char16_t const* name) {
+			return sprout::uuids::md5_name_generator(namespace_uuid)(name);
+		}
+		inline SPROUT_CONSTEXPR sprout::uuids::uuid
+		make_uuid3(sprout::uuids::uuid const& namespace_uuid, char32_t const* name) {
+			return sprout::uuids::md5_name_generator(namespace_uuid)(name);
+		}
+
+		inline SPROUT_CONSTEXPR sprout::uuids::md5_name_generator
+		make_uuid3() {
+			return sprout::uuids::md5_name_generator();
+		}
+		inline SPROUT_CONSTEXPR sprout::uuids::md5_name_generator
+		make_uuid3(sprout::uuids::uuid const& namespace_uuid) {
+			return sprout::uuids::md5_name_generator(namespace_uuid);
+		}
+
+		//
+		// make_uuid3_dns
+		// make_uuid3_url
+		// make_uuid3_oid
+		// make_uuid3_x500
+		//
+		inline SPROUT_CONSTEXPR sprout::uuids::md5_name_generator
+		make_uuid3_dns() {
+			return sprout::uuids::md5_name_generator(sprout::uuids::namespace_dns_uuid());
+		}
+		inline SPROUT_CONSTEXPR sprout::uuids::md5_name_generator
+		make_uuid3_url() {
+			return sprout::uuids::md5_name_generator(sprout::uuids::namespace_url_uuid());
+		}
+		inline SPROUT_CONSTEXPR sprout::uuids::md5_name_generator
+		make_uuid3_oid() {
+			return sprout::uuids::md5_name_generator(sprout::uuids::namespace_oid_uuid());
+		}
+		inline SPROUT_CONSTEXPR sprout::uuids::md5_name_generator
+		make_uuid3_x500() {
+			return sprout::uuids::md5_name_generator(sprout::uuids::namespace_x500_uuid());
+		}
 	}	// namespace uuids
 }	// namespace sprout
 
diff --git a/sprout/uuid/namespaces.hpp b/sprout/uuid/namespaces.hpp
new file mode 100644
index 00000000..48f15269
--- /dev/null
+++ b/sprout/uuid/namespaces.hpp
@@ -0,0 +1,64 @@
+#ifndef SPROUT_UUID_NAMESPACES_HPP
+#define SPROUT_UUID_NAMESPACES_HPP
+
+#include <sprout/config.hpp>
+#include <sprout/uuid/uuid.hpp>
+
+namespace sprout {
+	namespace uuids {
+		//
+		// namespace_dns_uuid
+		//
+		inline SPROUT_CONSTEXPR sprout::uuids::uuid
+		namespace_dns_uuid() {
+			return sprout::uuids::uuid{{
+				0x6b, 0xa7, 0xb8, 0x10,
+				0x9d, 0xad,
+				0x11, 0xd1,
+				0x80, 0xb4,
+				0x00, 0xc0, 0x4f, 0xd4, 0x30, 0xc8
+				}};
+		}
+		//
+		// namespace_url_uuid
+		//
+		inline SPROUT_CONSTEXPR sprout::uuids::uuid
+		namespace_url_uuid() {
+			return sprout::uuids::uuid{{
+				0x6b, 0xa7, 0xb8, 0x11,
+				0x9d, 0xad,
+				0x11, 0xd1,
+				0x80, 0xb4,
+				0x00, 0xc0, 0x4f, 0xd4, 0x30, 0xc8
+				}};
+		}
+		//
+		// namespace_oid_uuid
+		//
+		inline SPROUT_CONSTEXPR sprout::uuids::uuid
+		namespace_oid_uuid() {
+			return sprout::uuids::uuid{{
+				0x6b, 0xa7, 0xb8, 0x12,
+				0x9d, 0xad,
+				0x11, 0xd1,
+				0x80, 0xb4,
+				0x00, 0xc0, 0x4f, 0xd4, 0x30, 0xc8
+				}};
+		}
+		//
+		// namespace_x500_uuid
+		//
+		inline SPROUT_CONSTEXPR sprout::uuids::uuid
+		namespace_x500_uuid() {
+			return sprout::uuids::uuid{{
+				0x6b, 0xa7, 0xb8, 0x14,
+				0x9d, 0xad,
+				0x11, 0xd1,
+				0x80, 0xb4,
+				0x00, 0xc0, 0x4f, 0xd4, 0x30, 0xc8
+				}};
+		}
+	}	// namespace uuids
+}	// namespace sprout
+
+#endif	// #ifndef SPROUT_UUID_NAMESPACES_HPP
diff --git a/sprout/uuid/nil_generator.hpp b/sprout/uuid/nil_generator.hpp
index 29b6d89d..33fbc98b 100644
--- a/sprout/uuid/nil_generator.hpp
+++ b/sprout/uuid/nil_generator.hpp
@@ -17,6 +17,7 @@ namespace sprout {
 				return result_type{{0}};
 			}
 		};
+
 		//
 		// nil_uuid
 		//
diff --git a/sprout/uuid/random_generator.hpp b/sprout/uuid/random_generator.hpp
index 997326b9..f8b07b96 100644
--- a/sprout/uuid/random_generator.hpp
+++ b/sprout/uuid/random_generator.hpp
@@ -15,7 +15,7 @@ namespace sprout {
 		//
 		// basic_random_generator
 		//
-		template<typename UniformRandomNumberGenerator>
+		template<typename UniformRandomNumberGenerator = sprout::random::default_random_engine>
 		class basic_random_generator {
 		public:
 			typedef sprout::uuids::uuid result_type;
@@ -68,14 +68,16 @@ namespace sprout {
 			SPROUT_CONSTEXPR typename std::enable_if<
 				std::is_integral<T>::value,
 				result_type
-			>::type operator()(T const& seed) const {
+			>::type
+			operator()(T const& seed) const {
 				return operator()(engine_type(seed));
 			}
 			template<typename Engine>
 			SPROUT_CONSTEXPR typename std::enable_if<
 				!std::is_integral<Engine>::value,
 				result_type
-			>::type operator()(Engine const& engine) const {
+			>::type
+			operator()(Engine const& engine) const {
 				return random_to_uuid(sprout::random::combine(engine, distribution_)());
 			}
 		};
@@ -83,7 +85,27 @@ namespace sprout {
 		//
 		// random_generator
 		//
-		typedef sprout::uuids::basic_random_generator<sprout::random::default_random_engine> random_generator;
+		typedef sprout::uuids::basic_random_generator<> random_generator;
+
+		//
+		// make_uuid4
+		//
+		template<typename T>
+		SPROUT_CONSTEXPR typename std::enable_if<
+			std::is_integral<T>::value,
+			sprout::uuids::uuid
+		>::type
+		make_uuid4(T const& seed) {
+			return sprout::uuids::random_generator()(seed);
+		}
+		template<typename Engine>
+		SPROUT_CONSTEXPR typename std::enable_if<
+			!std::is_integral<Engine>::value,
+			sprout::uuids::uuid
+		>::type
+		make_uuid4(Engine const& engine) {
+			return sprout::uuids::random_generator()(engine);
+		}
 	}	// namespace uuids
 }	// namespace sprout
 
diff --git a/sprout/uuid/sha1_name_generator.hpp b/sprout/uuid/sha1_name_generator.hpp
index 6d1e375d..eeb692d5 100644
--- a/sprout/uuid/sha1_name_generator.hpp
+++ b/sprout/uuid/sha1_name_generator.hpp
@@ -4,6 +4,7 @@
 #include <sprout/config.hpp>
 #include <sprout/string.hpp>
 #include <sprout/uuid/uuid.hpp>
+#include <sprout/uuid/namespaces.hpp>
 #include <sprout/checksum/sha1.hpp>
 
 namespace sprout {
@@ -66,6 +67,85 @@ namespace sprout {
 				return sha_to_uuid(sum_.process_bytes(name, sprout::char_traits<char32_t>::length(name)));
 			}
 		};
+
+		//
+		// make_uuid5
+		//
+		template<typename Elem, std::size_t N, typename Traits>
+		inline SPROUT_CONSTEXPR sprout::uuids::uuid
+		make_uuid5(sprout::basic_string<Elem, N, Traits> const& name) {
+			return sprout::uuids::sha1_name_generator()(name);
+		}
+		inline SPROUT_CONSTEXPR sprout::uuids::uuid
+		make_uuid5(char const* name) {
+			return sprout::uuids::sha1_name_generator()(name);
+		}
+		inline SPROUT_CONSTEXPR sprout::uuids::uuid
+		make_uuid5(wchar_t const* name) {
+			return sprout::uuids::sha1_name_generator()(name);
+		}
+		inline SPROUT_CONSTEXPR sprout::uuids::uuid
+		make_uuid5(char16_t const* name) {
+			return sprout::uuids::sha1_name_generator()(name);
+		}
+		inline SPROUT_CONSTEXPR sprout::uuids::uuid
+		make_uuid5(char32_t const* name) {
+			return sprout::uuids::sha1_name_generator()(name);
+		}
+
+		template<typename Elem, std::size_t N, typename Traits>
+		inline SPROUT_CONSTEXPR sprout::uuids::uuid
+		make_uuid5(sprout::uuids::uuid const& namespace_uuid, sprout::basic_string<Elem, N, Traits> const& name) {
+			return sprout::uuids::sha1_name_generator(namespace_uuid)(name);
+		}
+		inline SPROUT_CONSTEXPR sprout::uuids::uuid
+		make_uuid5(sprout::uuids::uuid const& namespace_uuid, char const* name) {
+			return sprout::uuids::sha1_name_generator(namespace_uuid)(name);
+		}
+		inline SPROUT_CONSTEXPR sprout::uuids::uuid
+		make_uuid5(sprout::uuids::uuid const& namespace_uuid, wchar_t const* name) {
+			return sprout::uuids::sha1_name_generator(namespace_uuid)(name);
+		}
+		inline SPROUT_CONSTEXPR sprout::uuids::uuid
+		make_uuid5(sprout::uuids::uuid const& namespace_uuid, char16_t const* name) {
+			return sprout::uuids::sha1_name_generator(namespace_uuid)(name);
+		}
+		inline SPROUT_CONSTEXPR sprout::uuids::uuid
+		make_uuid5(sprout::uuids::uuid const& namespace_uuid, char32_t const* name) {
+			return sprout::uuids::sha1_name_generator(namespace_uuid)(name);
+		}
+
+		inline SPROUT_CONSTEXPR sprout::uuids::sha1_name_generator
+		make_uuid5() {
+			return sprout::uuids::sha1_name_generator();
+		}
+		inline SPROUT_CONSTEXPR sprout::uuids::sha1_name_generator
+		make_uuid5(sprout::uuids::uuid const& namespace_uuid) {
+			return sprout::uuids::sha1_name_generator(namespace_uuid);
+		}
+
+		//
+		// make_uuid5_dns
+		// make_uuid5_url
+		// make_uuid5_oid
+		// make_uuid5_x500
+		//
+		inline SPROUT_CONSTEXPR sprout::uuids::sha1_name_generator
+		make_uuid5_dns() {
+			return sprout::uuids::sha1_name_generator(sprout::uuids::namespace_dns_uuid());
+		}
+		inline SPROUT_CONSTEXPR sprout::uuids::sha1_name_generator
+		make_uuid5_url() {
+			return sprout::uuids::sha1_name_generator(sprout::uuids::namespace_url_uuid());
+		}
+		inline SPROUT_CONSTEXPR sprout::uuids::sha1_name_generator
+		make_uuid5_oid() {
+			return sprout::uuids::sha1_name_generator(sprout::uuids::namespace_oid_uuid());
+		}
+		inline SPROUT_CONSTEXPR sprout::uuids::sha1_name_generator
+		make_uuid5_x500() {
+			return sprout::uuids::sha1_name_generator(sprout::uuids::namespace_x500_uuid());
+		}
 	}	// namespace uuids
 }	// namespace sprout
 
diff --git a/sprout/uuid/string_generator.hpp b/sprout/uuid/string_generator.hpp
index bee1f33c..94126318 100644
--- a/sprout/uuid/string_generator.hpp
+++ b/sprout/uuid/string_generator.hpp
@@ -197,6 +197,36 @@ namespace sprout {
 				return operator()(s, s + sprout::char_traits<char32_t>::length(s));
 			}
 		};
+
+		//
+		// make_uuid
+		//
+		template<typename Iterator>
+		inline SPROUT_CONSTEXPR sprout::uuids::uuid
+		make_uuid(Iterator first, Iterator last) {
+			return sprout::uuids::string_generator()(first, last);
+		}
+		template<typename Elem, std::size_t N, typename Traits>
+		inline SPROUT_CONSTEXPR sprout::uuids::uuid
+		make_uuid(sprout::basic_string<Elem, N, Traits> const& s) {
+			return sprout::uuids::string_generator()(s);
+		}
+		inline SPROUT_CONSTEXPR sprout::uuids::uuid
+		make_uuid(char const* s) {
+			return sprout::uuids::string_generator()(s);
+		}
+		inline SPROUT_CONSTEXPR sprout::uuids::uuid
+		make_uuid(wchar_t const* s) {
+			return sprout::uuids::string_generator()(s);
+		}
+		inline SPROUT_CONSTEXPR sprout::uuids::uuid
+		make_uuid(char16_t const* s) {
+			return sprout::uuids::string_generator()(s);
+		}
+		inline SPROUT_CONSTEXPR sprout::uuids::uuid
+		make_uuid(char32_t const* s) {
+			return sprout::uuids::string_generator()(s);
+		}
 	}	// namespace uuids
 }	// namespace sprout
 
diff --git a/sprout/uuid/udl.hpp b/sprout/uuid/udl.hpp
index 800d9c1f..b91c801c 100644
--- a/sprout/uuid/udl.hpp
+++ b/sprout/uuid/udl.hpp
@@ -7,44 +7,224 @@
 #if SPROUT_USE_USER_DEFINED_LITERALS
 
 #include <cstddef>
+#include <type_traits>
+#include <sprout/string.hpp>
 #include <sprout/uuid/string_generator.hpp>
+#include <sprout/uuid/name_generator.hpp>
+#include <sprout/ctype/functor.hpp>
+#include <sprout/container/functions.hpp>
+#include <sprout/container/metafunctions.hpp>
+#include <sprout/range/algorithm/equal.hpp>
+#include <sprout/range/ptr_range.hpp>
 
 namespace sprout {
 	namespace uuids {
+		namespace detail {
+			template<typename T>
+			inline SPROUT_CONSTEXPR sprout::basic_string<T, 3>
+			dns_token();
+			template<>
+			inline SPROUT_CONSTEXPR sprout::basic_string<char, 3>
+			dns_token<char>() {
+				return sprout::to_string("dns");
+			}
+			template<>
+			inline SPROUT_CONSTEXPR sprout::basic_string<wchar_t, 3>
+			dns_token<wchar_t>() {
+				return sprout::to_string(L"dns");
+			}
+			template<>
+			inline SPROUT_CONSTEXPR sprout::basic_string<char16_t, 3>
+			dns_token<char16_t>() {
+				return sprout::to_string(u"dns");
+			}
+			template<>
+			inline SPROUT_CONSTEXPR sprout::basic_string<char32_t, 3>
+			dns_token<char32_t>() {
+				return sprout::to_string(U"dns");
+			}
+
+			template<typename T>
+			inline SPROUT_CONSTEXPR sprout::basic_string<T, 3>
+			url_token();
+			template<>
+			inline SPROUT_CONSTEXPR sprout::basic_string<char, 3>
+			url_token<char>() {
+				return sprout::to_string("url");
+			}
+			template<>
+			inline SPROUT_CONSTEXPR sprout::basic_string<wchar_t, 3>
+			url_token<wchar_t>() {
+				return sprout::to_string(L"url");
+			}
+			template<>
+			inline SPROUT_CONSTEXPR sprout::basic_string<char16_t, 3>
+			url_token<char16_t>() {
+				return sprout::to_string(u"url");
+			}
+			template<>
+			inline SPROUT_CONSTEXPR sprout::basic_string<char32_t, 3>
+			url_token<char32_t>() {
+				return sprout::to_string(U"url");
+			}
+
+			template<typename T>
+			inline SPROUT_CONSTEXPR sprout::basic_string<T, 3>
+			oid_token();
+			template<>
+			inline SPROUT_CONSTEXPR sprout::basic_string<char, 3>
+			oid_token<char>() {
+				return sprout::to_string("oid");
+			}
+			template<>
+			inline SPROUT_CONSTEXPR sprout::basic_string<wchar_t, 3>
+			oid_token<wchar_t>() {
+				return sprout::to_string(L"oid");
+			}
+			template<>
+			inline SPROUT_CONSTEXPR sprout::basic_string<char16_t, 3>
+			oid_token<char16_t>() {
+				return sprout::to_string(u"oid");
+			}
+			template<>
+			inline SPROUT_CONSTEXPR sprout::basic_string<char32_t, 3>
+			oid_token<char32_t>() {
+				return sprout::to_string(U"oid");
+			}
+
+			template<typename T>
+			inline SPROUT_CONSTEXPR sprout::basic_string<T, 4>
+			x500_token();
+			template<>
+			inline SPROUT_CONSTEXPR sprout::basic_string<char, 4>
+			x500_token<char>() {
+				return sprout::to_string("x500");
+			}
+			template<>
+			inline SPROUT_CONSTEXPR sprout::basic_string<wchar_t, 4>
+			x500_token<wchar_t>() {
+				return sprout::to_string(L"x500");
+			}
+			template<>
+			inline SPROUT_CONSTEXPR sprout::basic_string<char16_t, 4>
+			x500_token<char16_t>() {
+				return sprout::to_string(u"x500");
+			}
+			template<>
+			inline SPROUT_CONSTEXPR sprout::basic_string<char32_t, 4>
+			x500_token<char32_t>() {
+				return sprout::to_string(U"x500");
+			}
+
+			template<typename Range>
+			inline SPROUT_CONSTEXPR sprout::uuids::md5_name_generator
+			uuid3_impl(Range const& rng) {
+				typedef typename std::decay<typename sprout::containers::value_type<Range>::type>::type value_type;
+				typedef sprout::ctypes::nocase_equal_to<value_type> predicate_type;
+				return sprout::range::equal(rng, sprout::uuids::detail::dns_token<value_type>(), predicate_type()) ? sprout::uuids::make_uuid3_dns()
+					: sprout::range::equal(rng, sprout::uuids::detail::url_token<value_type>(), predicate_type()) ? sprout::uuids::make_uuid3_url()
+					: sprout::range::equal(rng, sprout::uuids::detail::oid_token<value_type>(), predicate_type()) ? sprout::uuids::make_uuid3_oid()
+					: sprout::range::equal(rng, sprout::uuids::detail::x500_token<value_type>(), predicate_type()) ? sprout::uuids::make_uuid3_x500()
+					: sprout::uuids::make_uuid3(sprout::uuids::make_uuid(sprout::begin(rng), sprout::end(rng)))
+					;
+			}
+
+			template<typename Range>
+			inline SPROUT_CONSTEXPR sprout::uuids::sha1_name_generator
+			uuid5_impl(Range const& rng) {
+				typedef typename std::decay<typename sprout::containers::value_type<Range>::type>::type value_type;
+				typedef sprout::ctypes::nocase_equal_to<value_type> predicate_type;
+				return sprout::range::equal(rng, sprout::uuids::detail::dns_token<value_type>(), predicate_type()) ? sprout::uuids::make_uuid5_dns()
+					: sprout::range::equal(rng, sprout::uuids::detail::url_token<value_type>(), predicate_type()) ? sprout::uuids::make_uuid5_url()
+					: sprout::range::equal(rng, sprout::uuids::detail::oid_token<value_type>(), predicate_type()) ? sprout::uuids::make_uuid5_oid()
+					: sprout::range::equal(rng, sprout::uuids::detail::x500_token<value_type>(), predicate_type()) ? sprout::uuids::make_uuid5_x500()
+					: sprout::uuids::make_uuid5(sprout::uuids::make_uuid(sprout::begin(rng), sprout::end(rng)))
+					;
+			}
+		}	// namespace detail
+
 		namespace udl {
 			//
 			// _uuid
 			//
 			inline SPROUT_CONSTEXPR sprout::uuids::uuid
 			operator"" _uuid(char const* s, std::size_t size) {
-				return sprout::uuids::string_generator()(s, s + size);
+				return sprout::uuids::make_uuid(s, s + size);
 			}
 			inline SPROUT_CONSTEXPR sprout::uuids::uuid
 			operator"" _uuid(wchar_t const* s, std::size_t size) {
-				return sprout::uuids::string_generator()(s, s + size);
+				return sprout::uuids::make_uuid(s, s + size);
 			}
 			inline SPROUT_CONSTEXPR sprout::uuids::uuid
 			operator"" _uuid(char16_t const* s, std::size_t size) {
-				return sprout::uuids::string_generator()(s, s + size);
+				return sprout::uuids::make_uuid(s, s + size);
 			}
 			inline SPROUT_CONSTEXPR sprout::uuids::uuid
 			operator"" _uuid(char32_t const* s, std::size_t size) {
-				return sprout::uuids::string_generator()(s, s + size);
+				return sprout::uuids::make_uuid(s, s + size);
+			}
+
+			//
+			// _uuid3
+			//
+			inline SPROUT_CONSTEXPR sprout::uuids::md5_name_generator
+			operator"" _uuid3(char const* s, std::size_t size) {
+				return sprout::uuids::detail::uuid3_impl(sprout::range::make_ptr_range(s, size));
+			}
+			inline SPROUT_CONSTEXPR sprout::uuids::md5_name_generator
+			operator"" _uuid3(wchar_t const* s, std::size_t size) {
+				return sprout::uuids::detail::uuid3_impl(sprout::range::make_ptr_range(s, size));
+			}
+			inline SPROUT_CONSTEXPR sprout::uuids::md5_name_generator
+			operator"" _uuid3(char16_t const* s, std::size_t size) {
+				return sprout::uuids::detail::uuid3_impl(sprout::range::make_ptr_range(s, size));
+			}
+			inline SPROUT_CONSTEXPR sprout::uuids::md5_name_generator
+			operator"" _uuid3(char32_t const* s, std::size_t size) {
+				return sprout::uuids::detail::uuid3_impl(sprout::range::make_ptr_range(s, size));
+			}
+
+			//
+			// _uuid5
+			//
+			inline SPROUT_CONSTEXPR sprout::uuids::sha1_name_generator
+			operator"" _uuid5(char const* s, std::size_t size) {
+				return sprout::uuids::detail::uuid5_impl(sprout::range::make_ptr_range(s, size));
+			}
+			inline SPROUT_CONSTEXPR sprout::uuids::sha1_name_generator
+			operator"" _uuid5(wchar_t const* s, std::size_t size) {
+				return sprout::uuids::detail::uuid5_impl(sprout::range::make_ptr_range(s, size));
+			}
+			inline SPROUT_CONSTEXPR sprout::uuids::sha1_name_generator
+			operator"" _uuid5(char16_t const* s, std::size_t size) {
+				return sprout::uuids::detail::uuid5_impl(sprout::range::make_ptr_range(s, size));
+			}
+			inline SPROUT_CONSTEXPR sprout::uuids::sha1_name_generator
+			operator"" _uuid5(char32_t const* s, std::size_t size) {
+				return sprout::uuids::detail::uuid5_impl(sprout::range::make_ptr_range(s, size));
 			}
 		}	// namespace udl
 
 		using sprout::uuids::udl::operator"" _uuid;
+		using sprout::uuids::udl::operator"" _uuid3;
+		using sprout::uuids::udl::operator"" _uuid5;
 	}	// namespace uuids
 
 	namespace udl {
 		namespace uuids {
 			using sprout::uuids::udl::operator"" _uuid;
+			using sprout::uuids::udl::operator"" _uuid3;
+			using sprout::uuids::udl::operator"" _uuid5;
 		}	// namespace uuids
 
 		using sprout::uuids::udl::operator"" _uuid;
+		using sprout::uuids::udl::operator"" _uuid3;
+		using sprout::uuids::udl::operator"" _uuid5;
 	}	// namespace udl
 
 	using sprout::uuids::udl::operator"" _uuid;
+	using sprout::uuids::udl::operator"" _uuid3;
+	using sprout::uuids::udl::operator"" _uuid5;
 }	// namespace sprout
 
 #endif	// #if SPROUT_USE_USER_DEFINED_LITERALS