merge

4 files changed, 539 insertions, 415 deletions

diff --git a/indra/llxuixml/llinitparam.cpp b/indra/llxuixml/llinitparam.cpp
index c024fd405e..482064ed7b 100644
--- a/indra/llxuixml/llinitparam.cpp
+++ b/indra/llxuixml/llinitparam.cpp
@@ -62,7 +62,6 @@ namespace LLInitParam
 		mInspectFunc(inspect_func),
 		mMinCount(min_count),
 		mMaxCount(max_count),
-		mGeneration(0),
 		mUserData(NULL)
 	{}
 
@@ -75,7 +74,6 @@ namespace LLInitParam
 		mInspectFunc(NULL),
 		mMinCount(0),
 		mMaxCount(0),
-		mGeneration(0),
 		mUserData(NULL)
 	{}
 
@@ -87,8 +85,6 @@ namespace LLInitParam
 	//
 	// Parser
 	//
-	S32 Parser::sNextParseGeneration = 0;
-
 	Parser::~Parser()
 	{}
 
@@ -162,9 +158,9 @@ namespace LLInitParam
 		return (param_address - baseblock_address);
 	}
 
-	bool BaseBlock::submitValue(const Parser::name_stack_t& name_stack, Parser& p, bool silent)
+	bool BaseBlock::submitValue(Parser::name_stack_t& name_stack, Parser& p, bool silent)
 	{
-		if (!deserializeBlock(p, std::make_pair(name_stack.begin(), name_stack.end()), -1))
+		if (!deserializeBlock(p, std::make_pair(name_stack.begin(), name_stack.end()), true))
 		{
 			if (!silent)
 			{
@@ -194,7 +190,7 @@ namespace LLInitParam
 		return true;
 	}
 
-	void BaseBlock::serializeBlock(Parser& parser, Parser::name_stack_t name_stack, const LLInitParam::BaseBlock* diff_block) const
+	void BaseBlock::serializeBlock(Parser& parser, Parser::name_stack_t& name_stack, const LLInitParam::BaseBlock* diff_block) const
 	{
 		// named param is one like LLView::Params::follows
 		// unnamed param is like LLView::Params::rect - implicit
@@ -213,8 +209,7 @@ namespace LLInitParam
 				// each param descriptor remembers its serial number
 				// so we can inspect the same param under different names
 				// and see that it has the same number
-				(*it)->mGeneration = parser.newParseGeneration();
-				name_stack.push_back(std::make_pair("", (*it)->mGeneration));
+				name_stack.push_back(std::make_pair("", true));
 				serialize_func(*param, parser, name_stack, diff_param);
 				name_stack.pop_back();
 			}
@@ -250,12 +245,7 @@ namespace LLInitParam
 					continue;
 				}
 
-				if (!duplicate)
-				{
-					it->second->mGeneration = parser.newParseGeneration();
-				}
-
-				name_stack.push_back(std::make_pair(it->first, it->second->mGeneration));
+				name_stack.push_back(std::make_pair(it->first, !duplicate));
 				const Param* diff_param = diff_block ? diff_block->getParamFromHandle(param_handle) : NULL;
 				serialize_func(*param, parser, name_stack, diff_param);
 				name_stack.pop_back();
@@ -278,8 +268,7 @@ namespace LLInitParam
 			ParamDescriptor::inspect_func_t inspect_func = (*it)->mInspectFunc;
 			if (inspect_func)
 			{
-				(*it)->mGeneration = parser.newParseGeneration();
-				name_stack.push_back(std::make_pair("", (*it)->mGeneration));
+				name_stack.push_back(std::make_pair("", true));
 				inspect_func(*param, parser, name_stack, (*it)->mMinCount, (*it)->mMaxCount);
 				name_stack.pop_back();
 			}
@@ -307,11 +296,7 @@ namespace LLInitParam
 					}
 				}
 
-				if (!duplicate)
-				{
-					it->second->mGeneration = parser.newParseGeneration();
-				}
-				name_stack.push_back(std::make_pair(it->first, it->second->mGeneration));
+				name_stack.push_back(std::make_pair(it->first, !duplicate));
 				inspect_func(*param, parser, name_stack, it->second->mMinCount, it->second->mMaxCount);
 				name_stack.pop_back();
 			}
@@ -320,16 +305,18 @@ namespace LLInitParam
 		return true;
 	}
 
-	bool BaseBlock::deserializeBlock(Parser& p, Parser::name_stack_range_t name_stack, S32 parent_generation)
+	bool BaseBlock::deserializeBlock(Parser& p, Parser::name_stack_range_t name_stack_range, bool ignored)
 	{
 		BlockDescriptor& block_data = mostDerivedBlockDescriptor();
-		bool names_left = name_stack.first != name_stack.second;
+		bool names_left = name_stack_range.first != name_stack_range.second;
 
-		S32 parse_generation = name_stack.first == name_stack.second ? -1 : name_stack.first->second;
+		bool new_name = names_left
+						? name_stack_range.first->second
+						: true;
 
 		if (names_left)
 		{
-			const std::string& top_name = name_stack.first->first;
+			const std::string& top_name = name_stack_range.first->first;
 
 			ParamDescriptor::deserialize_func_t deserialize_func = NULL;
 			Param* paramp = NULL;
@@ -341,9 +328,18 @@ namespace LLInitParam
 				paramp = getParamFromHandle(found_it->second->mParamHandle);
 				deserialize_func = found_it->second->mDeserializeFunc;
 					
-				Parser::name_stack_range_t new_name_stack(name_stack.first, name_stack.second);
+				Parser::name_stack_range_t new_name_stack(name_stack_range.first, name_stack_range.second);
 				++new_name_stack.first;
-				return deserialize_func(*paramp, p, new_name_stack, parse_generation);
+				if (deserialize_func(*paramp, p, new_name_stack, new_name))
+				{
+					// value is no longer new, we know about it now
+					name_stack_range.first->second = false;
+					return true;
+				}
+				else
+				{
+					return false;
+				}
 			}
 		}
 
@@ -355,7 +351,7 @@ namespace LLInitParam
 			Param* paramp = getParamFromHandle((*it)->mParamHandle);
 			ParamDescriptor::deserialize_func_t deserialize_func = (*it)->mDeserializeFunc;
 
-			if (deserialize_func && deserialize_func(*paramp, p, name_stack, parse_generation))
+			if (deserialize_func && deserialize_func(*paramp, p, name_stack_range, new_name))
 			{
 				return true;
 			}
@@ -365,7 +361,7 @@ namespace LLInitParam
 		// verify by calling readValue with NoParamValue type, an inherently unparseable type
 		if (!names_left)
 		{
-			NoParamValue no_value;
+			Flag no_value;
 			return p.readValue(no_value);
 		}
 
diff --git a/indra/llxuixml/llinitparam.h b/indra/llxuixml/llinitparam.h
index 69dcd474f7..1e295ada2d 100644
--- a/indra/llxuixml/llinitparam.h
+++ b/indra/llxuixml/llinitparam.h
@@ -38,6 +38,9 @@
 
 namespace LLInitParam
 {
+	// used to indicate no matching value to a given name when parsing
+	struct Flag{};
+
 	template<typename T> const T& defaultValue() { static T value; return value; }
 
 	template <typename T, bool IS_BOOST_FUNCTION = boost::is_convertible<T, boost::function_base>::value >
@@ -65,6 +68,12 @@ namespace LLInitParam
 		static bool equals(const LLSD &a, const LLSD &b) { return false; }
 	};
 
+	template<>
+	struct ParamCompare<Flag, false>
+	{
+		static bool equals(const Flag& a, const Flag& b) { return false; }
+	};
+
 	// helper functions and classes
 	typedef ptrdiff_t param_handle_t;
 
@@ -78,6 +87,7 @@ namespace LLInitParam
 
 		void setValueName(const std::string& key) {}
 		std::string getValueName() const { return ""; }
+		std::string calcValueName(const T& value) const { return ""; }
 		void clearValueName() const {}
 
 		static bool getValueFromName(const std::string& name, T& value)
@@ -115,6 +125,22 @@ namespace LLInitParam
 			return mValueName; 
 		}
 
+		std::string calcValueName(const T& value) const
+		{
+			value_name_map_t* map = getValueNames();
+			for (typename value_name_map_t::iterator it = map->begin(), end_it = map->end();
+				it != end_it;
+				++it)
+			{
+				if (ParamCompare<T>::equals(it->second, value))
+				{
+					return it->first;
+				}
+			}
+
+			return "";
+		}
+
 		void clearValueName() const
 		{
 			mValueName.clear();
@@ -188,13 +214,13 @@ namespace LLInitParam
 			}
 		};
 
-		typedef std::vector<std::pair<std::string, S32> >								name_stack_t;
-		typedef std::pair<name_stack_t::const_iterator, name_stack_t::const_iterator>	name_stack_range_t;
-		typedef std::vector<std::string>												possible_values_t;
+		typedef std::vector<std::pair<std::string, bool> >					name_stack_t;
+		typedef std::pair<name_stack_t::iterator, name_stack_t::iterator>	name_stack_range_t;
+		typedef std::vector<std::string>									possible_values_t;
 
 		typedef bool (*parser_read_func_t)(Parser& parser, void* output);
-		typedef bool (*parser_write_func_t)(Parser& parser, const void*, const name_stack_t&);
-		typedef boost::function<void (const name_stack_t&, S32, S32, const possible_values_t*)>	parser_inspect_func_t;
+		typedef bool (*parser_write_func_t)(Parser& parser, const void*, name_stack_t&);
+		typedef boost::function<void (name_stack_t&, S32, S32, const possible_values_t*)>	parser_inspect_func_t;
 
 		typedef std::map<const std::type_info*, parser_read_func_t, CompareTypeID>		parser_read_func_map_t;
 		typedef std::map<const std::type_info*, parser_write_func_t, CompareTypeID>		parser_write_func_map_t;
@@ -202,7 +228,6 @@ namespace LLInitParam
 
 		Parser(parser_read_func_map_t& read_map, parser_write_func_map_t& write_map, parser_inspect_func_map_t& inspect_map)
 		:	mParseSilently(false),
-			mParseGeneration(sNextParseGeneration),
 			mParserReadFuncs(&read_map),
 			mParserWriteFuncs(&write_map),
 			mParserInspectFuncs(&inspect_map)
@@ -219,7 +244,7 @@ namespace LLInitParam
 		    return false;
 	    }
 
-		template <typename T> bool writeValue(const T& param, const name_stack_t& name_stack)
+		template <typename T> bool writeValue(const T& param, name_stack_t& name_stack)
 		{
 		    parser_write_func_map_t::iterator found_it = mParserWriteFuncs->find(&typeid(T));
 		    if (found_it != mParserWriteFuncs->end())
@@ -230,7 +255,7 @@ namespace LLInitParam
 		}
 
 		// dispatch inspection to registered inspection functions, for each parameter in a param block
-		template <typename T> bool inspectValue(const name_stack_t& name_stack, S32 min_count, S32 max_count, const possible_values_t* possible_values)
+		template <typename T> bool inspectValue(name_stack_t& name_stack, S32 min_count, S32 max_count, const possible_values_t* possible_values)
 		{
 		    parser_inspect_func_map_t::iterator found_it = mParserInspectFuncs->find(&typeid(T));
 		    if (found_it != mParserInspectFuncs->end())
@@ -246,10 +271,6 @@ namespace LLInitParam
 		virtual void parserError(const std::string& message);
 		void setParseSilently(bool silent) { mParseSilently = silent; }
 
-		S32 getParseGeneration() { return mParseGeneration; }
-		S32 newParseGeneration() { return mParseGeneration = ++sNextParseGeneration; }
-
-
 	protected:
 		template <typename T>
 		void registerParserFuncs(parser_read_func_t read_func, parser_write_func_t write_func = NULL)
@@ -270,14 +291,8 @@ namespace LLInitParam
 		parser_read_func_map_t*		mParserReadFuncs;
 		parser_write_func_map_t*	mParserWriteFuncs;
 		parser_inspect_func_map_t*	mParserInspectFuncs;
-		S32	mParseGeneration;
-
-		static S32					sNextParseGeneration;
 	};
 
-	// used to indicate no matching value to a given name when parsing
-	struct NoParamValue{};
-
 	class BaseBlock;
 
 	class Param
@@ -318,7 +333,7 @@ namespace LLInitParam
 		};
 
 		typedef bool(*merge_func_t)(Param&, const Param&, bool);
-		typedef bool(*deserialize_func_t)(Param&, Parser&, const Parser::name_stack_range_t&, S32);
+		typedef bool(*deserialize_func_t)(Param&, Parser&, const Parser::name_stack_range_t&, bool);
 		typedef void(*serialize_func_t)(const Param&, Parser&, Parser::name_stack_t&, const Param* diff_param);
 		typedef void(*inspect_func_t)(const Param&, Parser&, Parser::name_stack_t&, S32 min_count, S32 max_count);
 		typedef bool(*validation_func_t)(const Param*);
@@ -343,7 +358,6 @@ namespace LLInitParam
 		validation_func_t	mValidationFunc;
 		S32					mMinCount;
 		S32					mMaxCount;
-		S32					mGeneration;
 		S32					mNumRefs;
 		UserData*			mUserData;
 	};
@@ -385,36 +399,36 @@ namespace LLInitParam
 		// "Multiple" constraint types, put here in root class to avoid ambiguity during use
 		struct AnyAmount
 		{
-			static U32 minCount() { return 0; }
-			static U32 maxCount() { return U32_MAX; }
+			enum { minCount = 0 };
+			enum { maxCount = U32_MAX };
 		};
 
 		template<U32 MIN_AMOUNT>
 		struct AtLeast
 		{
-			static U32 minCount() { return MIN_AMOUNT; }
-			static U32 maxCount() { return U32_MAX; }
+			enum { minCount = MIN_AMOUNT };
+			enum { maxCount = U32_MAX };
 		};
 
 		template<U32 MAX_AMOUNT>
 		struct AtMost
 		{
-			static U32 minCount() { return 0; }
-			static U32 maxCount() { return MAX_AMOUNT; }
+			enum { minCount = 0 };
+			enum { maxCount = MAX_AMOUNT };
 		};
 
 		template<U32 MIN_AMOUNT, U32 MAX_AMOUNT>
 		struct Between
 		{
-			static U32 minCount() { return MIN_AMOUNT; }
-			static U32 maxCount() { return MAX_AMOUNT; }
+			enum { minCount = MIN_AMOUNT };
+			enum { maxCount = MAX_AMOUNT };
 		};
 
 		template<U32 EXACT_COUNT>
 		struct Exactly
 		{
-			static U32 minCount() { return EXACT_COUNT; }
-			static U32 maxCount() { return EXACT_COUNT; }
+			enum { minCount = EXACT_COUNT };
+			enum { maxCount = EXACT_COUNT };
 		};
 
 		// this typedef identifies derived classes as being blocks
@@ -424,7 +438,7 @@ namespace LLInitParam
 
 		BaseBlock();
 		virtual ~BaseBlock();
-		bool submitValue(const Parser::name_stack_t& name_stack, Parser& p, bool silent=false);
+		bool submitValue(Parser::name_stack_t& name_stack, Parser& p, bool silent=false);
 
 		param_handle_t getHandleFromParam(const Param* param) const;
 		bool validateBlock(bool emit_errors = true) const;
@@ -450,8 +464,8 @@ namespace LLInitParam
 
 		S32 getLastChangeVersion() const { return mChangeVersion; }
 
-		bool deserializeBlock(Parser& p, Parser::name_stack_range_t name_stack, S32 generation);
-		void serializeBlock(Parser& p, Parser::name_stack_t name_stack = Parser::name_stack_t(), const BaseBlock* diff_block = NULL) const;
+		bool deserializeBlock(Parser& p, Parser::name_stack_range_t name_stack_range, bool new_name);
+		void serializeBlock(Parser& p, Parser::name_stack_t& name_stack, const BaseBlock* diff_block = NULL) const;
 		bool inspectBlock(Parser& p, Parser::name_stack_t name_stack = Parser::name_stack_t(), S32 min_count = 0, S32 max_count = S32_MAX) const;
 
 		virtual const BlockDescriptor& mostDerivedBlockDescriptor() const { return selfBlockDescriptor(); }
@@ -477,9 +491,9 @@ namespace LLInitParam
 		void init(BlockDescriptor& descriptor, BlockDescriptor& base_descriptor, size_t block_size);
 
 
-		bool mergeBlockParam(bool param_provided, BlockDescriptor& block_data, const BaseBlock& other, bool overwrite)
+		bool mergeBlockParam(bool source_provided, bool dst_provided, BlockDescriptor& block_data, const BaseBlock& source, bool overwrite)
 		{
-			return mergeBlock(block_data, other, overwrite);
+			return mergeBlock(block_data, source, overwrite);
 		}
 		// take all provided params from other and apply to self
 		bool mergeBlock(BlockDescriptor& block_data, const BaseBlock& other, bool overwrite);
@@ -497,92 +511,6 @@ namespace LLInitParam
 		const std::string& getParamName(const BlockDescriptor& block_data, const Param* paramp) const;
 	};
 
-	class BaseBlockWithFlags : public BaseBlock
-	{
-	public:
-		class FlagBase : public Param
-		{
-		public:
-			typedef FlagBase self_t;
-
-			FlagBase(const char* name, BaseBlock* enclosing_block) : Param(enclosing_block) 
-			{
-				if (LL_UNLIKELY(enclosing_block->mostDerivedBlockDescriptor().mInitializationState == BlockDescriptor::INITIALIZING))
-				{
-					ParamDescriptorPtr param_descriptor = ParamDescriptorPtr(new ParamDescriptor(
-						enclosing_block->getHandleFromParam(this),
-						&mergeWith,
-						&deserializeParam,
-						&serializeParam,
-						NULL,
-						&inspectParam,
-						0, 1));
-					BaseBlock::addParam(enclosing_block->mostDerivedBlockDescriptor(), param_descriptor, name);
-				}
-			}
-
-			bool isProvided() const { return anyProvided(); }
-
-		private:
-			static bool mergeWith(Param& dst, const Param& src, bool overwrite)
-			{
-				const self_t& src_typed_param = static_cast<const self_t&>(src);
-				self_t& dst_typed_param = static_cast<self_t&>(dst);
-
-				if (src_typed_param.isProvided()
-					&& (overwrite || !dst_typed_param.isProvided()))
-				{
-					dst.setProvided(true);
-					return true;
-				}
-				return false;
-			}
-
-			static bool deserializeParam(Param& param, Parser& parser, const Parser::name_stack_range_t& name_stack, S32 generation)
-			{
-				self_t& typed_param = static_cast<self_t&>(param);
-
-				// no further names in stack, parse value now
-				if (name_stack.first == name_stack.second)
-				{
-					typed_param.setProvided(true);
-					typed_param.enclosingBlock().paramChanged(param, true);
-					return true;
-				}
-
-				return false;
-			}
-
-			static void serializeParam(const Param& param, Parser& parser, Parser::name_stack_t& name_stack, const Param* diff_param)
-			{
-				const self_t& typed_param = static_cast<const self_t&>(param);
-				const self_t* typed_diff_param = static_cast<const self_t*>(diff_param);
-
-				if (!typed_param.isProvided()) return;
-
-				if (!name_stack.empty())
-				{
-					name_stack.back().second = parser.newParseGeneration();
-				}
-
-				// then try to serialize value directly
-				if (!typed_diff_param || !typed_diff_param->isProvided())
-				{
-					if (!parser.writeValue(NoParamValue(), name_stack)) 
-					{
-						return;
-					}
-				}
-			}
-
-			static void inspectParam(const Param& param, Parser& parser, Parser::name_stack_t& name_stack, S32 min_count, S32 max_count)
-			{
-				// tell parser about our actual type
-				parser.inspectValue<NoParamValue>(name_stack, min_count, max_count, NULL);
-			}
-		};
-	};
-
 	// these templates allow us to distinguish between template parameters
 	// that derive from BaseBlock and those that don't
 	template<typename T, typename Void = void>
@@ -604,7 +532,7 @@ namespace LLInitParam
 		typedef const T&							value_assignment_t;
 
 		ParamValue(): mValue() {}
-		ParamValue(const T& other) : mValue(other) {}
+		ParamValue(value_assignment_t other) : mValue(other) {}
 
 		void setValue(value_assignment_t val)
 		{
@@ -621,6 +549,17 @@ namespace LLInitParam
 			return mValue;
 		}
 
+		operator value_assignment_t() const
+		{
+			return mValue;
+		}
+
+		value_assignment_t operator()() const
+		{
+			return mValue;
+		}
+
+
 	private:
 		T mValue;
 	};
@@ -633,10 +572,6 @@ namespace LLInitParam
 	public:
 		typedef const T&							value_assignment_t;
 
-		S32 			mKeyVersion;
-		mutable S32 	mValidatedVersion;
-		mutable bool 	mValidated; // lazy validation flag
-
 		ParamValue() 
 		:	T(),
 			mKeyVersion(0),
@@ -644,13 +579,12 @@ namespace LLInitParam
 			mValidated(false)
 		{}
 
-		ParamValue(const T& other)
+		ParamValue(value_assignment_t other)
 		:	T(other),
 			mKeyVersion(0),
 			mValidatedVersion(-1),
 			mValidated(false)
-		{
-		}
+		{}
 
 		void setValue(value_assignment_t val)
 		{
@@ -666,6 +600,22 @@ namespace LLInitParam
 		{
 			return *this;
 		}
+
+		operator value_assignment_t() const
+		{
+			return *this;
+		}
+		
+		value_assignment_t operator()() const
+		{
+			return *this;
+		}
+
+		S32 			mKeyVersion;
+
+	protected:
+		mutable S32 	mValidatedVersion;
+		mutable bool 	mValidated; // lazy validation flag
 	};
 
 	template<typename T, typename NAME_VALUE_LOOKUP = TypeValues<T> >
@@ -712,11 +662,11 @@ namespace LLInitParam
 
 		bool isProvided() const { return Param::anyProvided(); }
 
-		static bool deserializeParam(Param& param, Parser& parser, const Parser::name_stack_range_t& name_stack, S32 generation) 
+		static bool deserializeParam(Param& param, Parser& parser, const Parser::name_stack_range_t& name_stack_range, bool new_name)
 		{ 
 			self_t& typed_param = static_cast<self_t&>(param);
 			// no further names in stack, attempt to parse value now
-			if (name_stack.first == name_stack.second)
+			if (name_stack_range.first == name_stack_range.second)
 			{
 				if (parser.readValue(typed_param.getValue()))
 				{
@@ -755,7 +705,7 @@ namespace LLInitParam
 
 			if (!name_stack.empty())
 			{
-				name_stack.back().second = parser.newParseGeneration();
+				name_stack.back().second = true;
 			}
 
 			std::string key = typed_param.getValueName();
@@ -766,10 +716,7 @@ namespace LLInitParam
 			{
 				if (!diff_param || !ParamCompare<std::string>::equals(static_cast<const self_t*>(diff_param)->getValueName(), key))
 				{
-					if (!parser.writeValue(key, name_stack))
-					{
-						return;
-					}
+					parser.writeValue(key, name_stack);
 				}
 			}
 			// then try to serialize value directly
@@ -777,7 +724,11 @@ namespace LLInitParam
 			{
 				if (!parser.writeValue(typed_param.getValue(), name_stack)) 
 				{
-					return;
+					std::string calculated_key = typed_param.calcValueName(typed_param.getValue());
+					if (!diff_param || !ParamCompare<std::string>::equals(static_cast<const self_t*>(diff_param)->getValueName(), calculated_key))
+					{
+						parser.writeValue(calculated_key, name_stack);
+					}
 				}
 			}
 		}
@@ -801,11 +752,6 @@ namespace LLInitParam
 			Param::enclosingBlock().paramChanged(*this, flag_as_provided);
 		}
 
-		// implicit conversion
-		operator value_assignment_t() const { return param_value_t::getValue(); } 
-		// explicit conversion
-		value_assignment_t operator()() const { return param_value_t::getValue(); } 
-
 	protected:
 
 		static bool mergeWith(Param& dst, const Param& src, bool overwrite)
@@ -855,11 +801,11 @@ namespace LLInitParam
 			}
 		}
 
-		static bool deserializeParam(Param& param, Parser& parser, const Parser::name_stack_range_t& name_stack, S32 generation) 
+		static bool deserializeParam(Param& param, Parser& parser, const Parser::name_stack_range_t& name_stack_range, bool new_name)
 		{ 
 			self_t& typed_param = static_cast<self_t&>(param);
 			// attempt to parse block...
-			if(typed_param.deserializeBlock(parser, name_stack, generation))
+			if(typed_param.deserializeBlock(parser, name_stack_range, new_name))
 			{
 				typed_param.clearValueName();
 				typed_param.enclosingBlock().paramChanged(param, true);
@@ -895,7 +841,7 @@ namespace LLInitParam
 
 			if (!name_stack.empty())
 			{
-				name_stack.back().second = parser.newParseGeneration();
+				name_stack.back().second = true;
 			}
 
 			std::string key = typed_param.getValueName();
@@ -958,11 +904,6 @@ namespace LLInitParam
 			}
 		}
 
-		// implicit conversion
-		operator value_assignment_t() const { return param_value_t::getValue(); } 
-		// explicit conversion
-		value_assignment_t operator()() const { return param_value_t::getValue(); } 
-
 	protected:
 
 		static bool mergeWith(Param& dst, const Param& src, bool overwrite)
@@ -972,8 +913,7 @@ namespace LLInitParam
 
 			if (src_typed_param.anyProvided())
 			{
-				bool param_provided = src_typed_param.isProvided() && (overwrite || !dst_typed_param.isProvided());
-				if (dst_typed_param.mergeBlockParam(param_provided, param_value_t::selfBlockDescriptor(), src_typed_param, overwrite))
+				if (dst_typed_param.mergeBlockParam(src_typed_param.isProvided(), dst_typed_param.isProvided(), param_value_t::selfBlockDescriptor(), src_typed_param, overwrite))
 				{
 					dst_typed_param.clearValueName();
 					dst_typed_param.setProvided(true);
@@ -992,7 +932,7 @@ namespace LLInitParam
 	{
 	public:
 		typedef TypedParam<VALUE_TYPE, NAME_VALUE_LOOKUP, true, false>		self_t;
-		typedef ParamValue<VALUE_TYPE, NAME_VALUE_LOOKUP>			param_value_t;
+		typedef ParamValue<VALUE_TYPE, NAME_VALUE_LOOKUP>					param_value_t;
 		typedef typename std::vector<param_value_t>							container_t;
 		typedef const container_t&											value_assignment_t;
 
@@ -1020,12 +960,12 @@ namespace LLInitParam
 
 		bool isProvided() const { return Param::anyProvided(); }
 
-		static bool deserializeParam(Param& param, Parser& parser, const Parser::name_stack_range_t& name_stack, S32 generation) 
+		static bool deserializeParam(Param& param, Parser& parser, const Parser::name_stack_range_t& name_stack_range, bool new_name)
 		{ 
 			self_t& typed_param = static_cast<self_t&>(param);
 			value_t value;
 			// no further names in stack, attempt to parse value now
-			if (name_stack.first == name_stack.second)
+			if (name_stack_range.first == name_stack_range.second)
 			{
 				// attempt to read value directly
 				if (parser.readValue(value))
@@ -1065,14 +1005,19 @@ namespace LLInitParam
 				++it)
 			{
 				std::string key = it->getValue();
-				name_stack.back().second = parser.newParseGeneration();
+				name_stack.back().second = true;
 
 				if(key.empty())
 				// not parsed via name values, write out value directly
 				{
-					if (!parser.writeValue(*it, name_stack))
+					bool value_written = parser.writeValue(*it, name_stack);
+					if (!value_written)
 					{
-						break;
+						std::string calculated_key = typed_param.calcValueName(typed_param.getValue());
+						if (!parser.writeValue(calculated_key, name_stack))
+						{
+							break;
+						}
 					}
 				}
 				else 
@@ -1118,6 +1063,8 @@ namespace LLInitParam
 
 		// implicit conversion
 		operator value_assignment_t() const { return mValues; } 
+		// explicit conversion		
+		value_assignment_t operator()() const { return mValues; }
 
 		typedef typename container_t::iterator iterator;
 		typedef typename container_t::const_iterator const_iterator;
@@ -1169,14 +1116,13 @@ namespace LLInitParam
 	public:
 		typedef TypedParam<VALUE_TYPE, NAME_VALUE_LOOKUP, true, true>	self_t;
 		typedef ParamValue<VALUE_TYPE, NAME_VALUE_LOOKUP>				param_value_t;
-		typedef typename std::vector<param_value_t>						container_t;
+		typedef typename std::vector<param_value_t>				container_t;
 		typedef const container_t&										value_assignment_t;
 		typedef VALUE_TYPE												value_t;
 		typedef NAME_VALUE_LOOKUP										name_value_lookup_t;
 
 		TypedParam(BlockDescriptor& block_descriptor, const char* name, value_assignment_t value, ParamDescriptor::validation_func_t validate_func, S32 min_count, S32 max_count) 
-		:	Param(block_descriptor.mCurrentBlockPtr),
-			mLastParseGeneration(0)
+		:	Param(block_descriptor.mCurrentBlockPtr)
 		{
 			std::copy(value.begin(), value.end(), back_inserter(mValues));
 
@@ -1196,13 +1142,12 @@ namespace LLInitParam
 
 		bool isProvided() const { return Param::anyProvided(); }
 
-		static bool deserializeParam(Param& param, Parser& parser, const Parser::name_stack_range_t& name_stack, S32 generation) 
+		static bool deserializeParam(Param& param, Parser& parser, const Parser::name_stack_range_t& name_stack_range, bool new_name) 
 		{ 
 			self_t& typed_param = static_cast<self_t&>(param);
 			bool new_value = false;
 
-			if (generation != typed_param.mLastParseGeneration 
-				|| typed_param.mValues.empty())
+			if (new_name || typed_param.mValues.empty())
 			{
 				new_value = true;
 				typed_param.mValues.push_back(value_t());
@@ -1211,12 +1156,8 @@ namespace LLInitParam
 			param_value_t& value = typed_param.mValues.back();
 
 			// attempt to parse block...
-			if(value.deserializeBlock(parser, name_stack, generation))
+			if(value.deserializeBlock(parser, name_stack_range, new_name))
 			{
-				if (new_value)
-				{	// successfully parsed new value, let's keep it
-					typed_param.mLastParseGeneration = generation;
-				}
 				typed_param.enclosingBlock().paramChanged(param, true);
 				typed_param.setProvided(true);
 				return true;
@@ -1230,11 +1171,6 @@ namespace LLInitParam
 					// try to parse a per type named value
 					if (name_value_lookup_t::getValueFromName(name, value.getValue()))
 					{
-						if (new_value)
-						{	// successfully parsed new value, let's keep it
-							typed_param.mLastParseGeneration = generation;
-						}
-
 						typed_param.mValues.back().setValueName(name);
 						typed_param.mValues.back().mKeyVersion = value.getLastChangeVersion();
 						typed_param.enclosingBlock().paramChanged(param, true);
@@ -1262,7 +1198,7 @@ namespace LLInitParam
 				it != end_it;
 				++it)
 			{
-				name_stack.back().second = parser.newParseGeneration();
+				name_stack.back().second = true;
 
 				std::string key = it->getValueName();
 				if (!key.empty() && it->mKeyVersion == it->getLastChangeVersion())
@@ -1308,6 +1244,8 @@ namespace LLInitParam
 
 		// implicit conversion
 		operator value_assignment_t() const { return mValues; } 
+		// explicit conversion
+		value_assignment_t operator()() const { return mValues; }
 
 		typedef typename container_t::iterator iterator;
 		typedef typename container_t::const_iterator const_iterator;
@@ -1358,15 +1296,13 @@ namespace LLInitParam
 		}
 
 		container_t			mValues;
-
-		S32			mLastParseGeneration;
 	};
 
 	template <typename DERIVED_BLOCK>
-	class Choice : public BaseBlock
+	class ChoiceBlock : public BaseBlock
 	{
-		typedef Choice<DERIVED_BLOCK>	self_t;
-		typedef Choice<DERIVED_BLOCK>	enclosing_block_t;
+		typedef ChoiceBlock<DERIVED_BLOCK>	self_t;
+		typedef ChoiceBlock<DERIVED_BLOCK>	enclosing_block_t;
 		
 		LOG_CLASS(self_t);
 	public:
@@ -1382,11 +1318,13 @@ namespace LLInitParam
 			return mergeBlock(selfBlockDescriptor(), other, false);
 		}
 
-		bool mergeBlockParam(bool param_provided, BlockDescriptor& block_data, const self_t& other, bool overwrite)
+		bool mergeBlockParam(bool source_provided, bool dest_provided, BlockDescriptor& block_data, const self_t& source, bool overwrite)
 		{
-			if (param_provided)
+			bool source_override = source_provided && (overwrite || !dest_provided);
+
+			if (source_override || source.mCurChoice == mCurChoice)
 			{
-				return mergeBlock(block_data, other, overwrite);
+				return mergeBlock(block_data, source, overwrite);
 			}
 			return false;
 		}
@@ -1420,7 +1358,7 @@ namespace LLInitParam
 		virtual BlockDescriptor& mostDerivedBlockDescriptor() { return selfBlockDescriptor(); }
 
 	protected:
-		Choice()
+		ChoiceBlock()
 		:	mCurChoice(0)
 		{
 			BaseBlock::init(selfBlockDescriptor(), BaseBlock::selfBlockDescriptor(), sizeof(DERIVED_BLOCK));
@@ -1433,13 +1371,13 @@ namespace LLInitParam
 		class Alternative : public TypedParam<T, NAME_VALUE_LOOKUP, false>
 		{
 		public:
-			friend class Choice<DERIVED_BLOCK>;
+			friend class ChoiceBlock<DERIVED_BLOCK>;
 
 			typedef Alternative<T, NAME_VALUE_LOOKUP>									self_t;
 			typedef TypedParam<T, NAME_VALUE_LOOKUP, false, IsBlock<ParamValue<T, NAME_VALUE_LOOKUP> >::value>		super_t;
 			typedef typename super_t::value_assignment_t								value_assignment_t;
 
-			explicit Alternative(const char* name, value_assignment_t val = defaultValue<T>())
+			explicit Alternative(const char* name = "", value_assignment_t val = defaultValue<T>())
 			:	super_t(DERIVED_BLOCK::selfBlockDescriptor(), name, val, NULL, 0, 1),
 				mOriginalValue(val)
 			{
@@ -1454,10 +1392,19 @@ namespace LLInitParam
 				}
 			}
 
-			Alternative& operator=(value_assignment_t val)
+			void choose()
+			{
+				static_cast<enclosing_block_t&>(Param::enclosingBlock()).paramChanged(*this, true);
+			}
+
+			void chooseAs(value_assignment_t val)
+			{
+				super_t::set(val);
+			}
+
+			void operator=(value_assignment_t val)
 			{
 				super_t::set(val);
-				return *this;
 			}
 
 			void operator()(typename super_t::value_assignment_t val) 
@@ -1466,12 +1413,8 @@ namespace LLInitParam
 			}
 
 			operator value_assignment_t() const 
-			{ 
-				if (static_cast<enclosing_block_t&>(Param::enclosingBlock()).getCurrentChoice() == this)
-				{
-					return super_t::getValue(); 
-				}
-				return mOriginalValue;
+			{
+				return (*this)();
 			} 
 
 			value_assignment_t operator()() const 
@@ -1508,7 +1451,7 @@ namespace LLInitParam
 		}
 	};
 
-	template <typename DERIVED_BLOCK, typename BASE_BLOCK = BaseBlockWithFlags>
+	template <typename DERIVED_BLOCK, typename BASE_BLOCK = BaseBlock>
 	class Block 
 	:	public BASE_BLOCK
 	{
@@ -1604,13 +1547,6 @@ namespace LLInitParam
 
 		};
 
-		class Flag : public BaseBlockWithFlags::FlagBase
-		{
-		public:
-			Flag(const char* name) : FlagBase(name, DERIVED_BLOCK::selfBlockDescriptor().mCurrentBlockPtr)
-			{}
-		};
-
 		template <typename T, typename RANGE = BaseBlock::AnyAmount, typename NAME_VALUE_LOOKUP = TypeValues<T> >
 		class Multiple : public TypedParam<T, NAME_VALUE_LOOKUP, true>
 		{
@@ -1623,7 +1559,7 @@ namespace LLInitParam
 			typedef typename super_t::const_iterator								const_iterator;
 
 			explicit Multiple(const char* name = "")
-			:	super_t(DERIVED_BLOCK::selfBlockDescriptor(), name, container_t(), &validate, RANGE::minCount(), RANGE::maxCount())
+			:	super_t(DERIVED_BLOCK::selfBlockDescriptor(), name, container_t(), &validate, RANGE::minCount, RANGE::maxCount)
 			{}
 
 			Multiple& operator=(value_assignment_t val)
@@ -1641,100 +1577,10 @@ namespace LLInitParam
 			static bool validate(const Param* paramp) 
 			{
 				U32 num_valid = ((super_t*)paramp)->numValidElements();
-				return RANGE::minCount() <= num_valid && num_valid <= RANGE::maxCount();
+				return RANGE::minCount <= num_valid && num_valid <= RANGE::maxCount;
 			}
 		};
 
-		template <typename T, typename RANGE = BaseBlock::AnyAmount, typename NAME_VALUE_LOOKUP = TypeValues<T> >
-		class Batch : private TypedParam<T, NAME_VALUE_LOOKUP, false>
-		{
-		public:
-			typedef ParamValue<T, NAME_VALUE_LOOKUP>										param_value_t;
-			typedef TypedParam<T, NAME_VALUE_LOOKUP, false, IsBlock<param_value_t>::value>	super_t;
-			typedef Batch<T, RANGE, NAME_VALUE_LOOKUP>										self_t;
-			typedef typename super_t::value_assignment_t									value_assignment_t;
-			typedef typename super_t::value_t												value_t;
-
-			struct BatchDefaultValue : public ParamDescriptor::UserData
-			{
-				BatchDefaultValue(const T& value)
-				:	mValue(value)
-				{}
-
-				T mValue;
-			};
-
-			explicit Batch(const char* name, value_assignment_t val)
-			:	super_t(DERIVED_BLOCK::selfBlockDescriptor(), name, val, NULL, 0, 1),
-				mLastParseGeneration(-1)
-			{
-				BlockDescriptor& block_descriptor = DERIVED_BLOCK::selfBlockDescriptor();
-				if (LL_UNLIKELY(block_descriptor.mInitializationState == BlockDescriptor::INITIALIZING))
-				{
-					ParamDescriptorPtr param_descriptorp = block_descriptor.mCurrentBlockPtr->findParamDescriptor(*this);
-
-					if (param_descriptorp)
-					{
-						param_descriptorp->mDeserializeFunc = &deserializeParam;
-						param_descriptorp->mUserData = new BatchDefaultValue(new param_value_t(val));
-					}
-				}
-			}
-
-			explicit Batch(const char* name = "")
-			:	super_t(DERIVED_BLOCK::selfBlockDescriptor(), name, defaultValue<T>(), NULL, 0, 1),
-				mLastParseGeneration(-1)
-			{
-				BlockDescriptor& block_descriptor = DERIVED_BLOCK::selfBlockDescriptor();
-				if (LL_UNLIKELY(block_descriptor.mInitializationState == BlockDescriptor::INITIALIZING))
-				{
-					ParamDescriptorPtr param_descriptorp = block_descriptor.mCurrentBlockPtr->findParamDescriptor(*this);
-
-					if (param_descriptorp)
-					{
-						param_descriptorp->mDeserializeFunc = &deserializeParam;
-					}
-				}
-			}
-
-			Batch& operator=(value_assignment_t val)
-			{
-				set(val);
-				return *this;
-			}
-
-			DERIVED_BLOCK& operator()(value_assignment_t val)
-			{
-				super_t::set(val);
-				return static_cast<DERIVED_BLOCK&>(Param::enclosingBlock());
-			}
-
-			using super_t::operator();
-
-		private:
-			static bool deserializeParam(Param& param, Parser& parser, const Parser::name_stack_range_t& name_stack, S32 generation) 
-			{
-				self_t& typed_param = static_cast<self_t&>(param);
-
-				if (generation != typed_param.mLastParseGeneration)
-				{
-					ParamDescriptorPtr descriptor = typed_param.enclosingBlock().findParamDescriptor(param);
-					if (descriptor && static_cast<BatchDefaultValue*>(descriptor->mUserData))
-					{
-						static_cast<param_value_t&>(typed_param) = (static_cast<BatchDefaultValue*>(descriptor->mUserData))->mValue;
-					}
-					else
-					{
-						static_cast<param_value_t&>(typed_param) = param_value_t(value_t());
-					}
-					typed_param.mLastParseGeneration = generation;
-				}
-				return super_t::deserializeParam(param, parser, name_stack, generation);
-			}
-
-			S32 mLastParseGeneration;
-		};
-
 		class Deprecated : public Param
 		{
 		public:
@@ -1756,9 +1602,9 @@ namespace LLInitParam
 				}
 			}
 			
-			static bool deserializeParam(Param& param, Parser& parser, const Parser::name_stack_range_t& name_stack, S32 generation)
+			static bool deserializeParam(Param& param, Parser& parser, const Parser::name_stack_range_t& name_stack_range, bool new_name)
 			{
-				if (name_stack.first == name_stack.second)
+				if (name_stack_range.first == name_stack_range.second)
 				{
 					//std::string message = llformat("Deprecated value %s ignored", getName().c_str());
 					//parser.parserWarning(message);
@@ -1769,6 +1615,7 @@ namespace LLInitParam
 			}
 		};
 
+		// different semantics for documentation purposes, but functionally identical
 		typedef Deprecated Ignored;
 
 	protected:
@@ -1790,6 +1637,160 @@ namespace LLInitParam
 
 	};
 	
+	template <typename DERIVED_BLOCK, typename BASE_BLOCK = BaseBlock>
+	class BatchBlock
+	:	public Block<DERIVED_BLOCK, BASE_BLOCK>
+	{
+	public:
+		typedef BatchBlock<DERIVED_BLOCK, BASE_BLOCK> self_t;
+		typedef Block<DERIVED_BLOCK, BASE_BLOCK> super_t;
+
+		BatchBlock()
+		{}
+
+		bool deserializeBlock(Parser& p, Parser::name_stack_range_t name_stack_range, bool new_name)
+		{
+			if (new_name)
+			{
+				// reset block
+				*static_cast<DERIVED_BLOCK*>(this) = defaultBatchValue();
+			}
+			return super_t::deserializeBlock(p, name_stack_range, new_name);
+		}
+
+		bool mergeBlock(BlockDescriptor& block_data, const BaseBlock& other, bool overwrite)
+		{
+			if (overwrite)
+			{
+				*static_cast<DERIVED_BLOCK*>(this) = defaultBatchValue();
+				// merge individual parameters into destination
+				return super_t::mergeBlock(super_t::selfBlockDescriptor(), other, overwrite);
+			}
+			return false;
+		}
+	protected:
+		static const DERIVED_BLOCK& defaultBatchValue()
+		{
+			static DERIVED_BLOCK default_value;
+			return default_value;
+		}
+	};
+
+	// FIXME: this specialization is not currently used, as it only matches against the BatchBlock base class
+	// and not the derived class with the actual params
+	template<typename DERIVED_BLOCK,
+			typename BASE_BLOCK,
+			typename NAME_VALUE_LOOKUP>
+	class ParamValue <BatchBlock<DERIVED_BLOCK, BASE_BLOCK>,
+					NAME_VALUE_LOOKUP,
+					true>
+	:	public NAME_VALUE_LOOKUP,
+		protected BatchBlock<DERIVED_BLOCK, BASE_BLOCK>
+	{
+	public:
+		typedef BatchBlock<DERIVED_BLOCK, BASE_BLOCK> block_t;
+		typedef const BatchBlock<DERIVED_BLOCK, BASE_BLOCK>&	value_assignment_t;
+
+		ParamValue()
+		:	block_t(),
+			mKeyVersion(0),
+			mValidatedVersion(-1),
+			mValidated(false)
+		{}
+
+		ParamValue(value_assignment_t other)
+		:	block_t(other),
+			mKeyVersion(0),
+			mValidatedVersion(-1),
+			mValidated(false)
+		{
+		}
+
+		void setValue(value_assignment_t val)
+		{
+			*this = val;
+		}
+
+		value_assignment_t getValue() const
+		{
+			return *this;
+		}
+
+		BatchBlock<DERIVED_BLOCK, BASE_BLOCK>& getValue()
+		{
+			return *this;
+		}
+
+		operator value_assignment_t() const
+		{
+			return *this;
+		}
+
+		value_assignment_t operator()() const
+		{
+			return *this;
+		}
+
+		S32 			mKeyVersion;
+
+	protected:
+		mutable S32 	mValidatedVersion;
+		mutable bool 	mValidated; // lazy validation flag
+	};
+
+	template <>
+	class ParamValue <LLSD,
+					TypeValues<LLSD>,
+					false>
+	:	public TypeValues<LLSD>,
+		public BaseBlock
+	{
+	public:
+		typedef ParamValue<LLSD, TypeValues<LLSD>, false> self_t;
+		typedef const LLSD&	value_assignment_t;
+
+		ParamValue()
+		:	mKeyVersion(0),
+			mValidatedVersion(-1),
+			mValidated(false)
+		{}
+
+		ParamValue(value_assignment_t other)
+		:	mValue(other),
+			mKeyVersion(0),
+			mValidatedVersion(-1),
+			mValidated(false)
+		{}
+
+		void setValue(value_assignment_t val) { mValue = val; }
+
+		value_assignment_t getValue() const { return mValue; }
+		LLSD& getValue() { return mValue; }
+
+		operator value_assignment_t() const { return mValue; }
+		value_assignment_t operator()() const { return mValue; }
+		
+		S32 			mKeyVersion;
+
+		// block param interface
+		bool deserializeBlock(Parser& p, Parser::name_stack_range_t name_stack_range, bool new_name);
+		void serializeBlock(Parser& p, Parser::name_stack_t& name_stack, const BaseBlock* diff_block = NULL) const;
+		bool inspectBlock(Parser& p, Parser::name_stack_t name_stack = Parser::name_stack_t(), S32 min_count = 0, S32 max_count = S32_MAX) const
+		{
+			//TODO: implement LLSD params as schema type Any
+			return true;
+		}
+
+	protected:
+		mutable S32 	mValidatedVersion;
+		mutable bool 	mValidated; // lazy validation flag
+
+	private:
+		static void serializeElement(Parser& p, const LLSD& sd, Parser::name_stack_t& name_stack);
+
+		LLSD mValue;
+	};
+
 	template<typename T>
 	class CustomParamValue
 	:	public Block<ParamValue<T, TypeValues<T> > >,
@@ -1816,11 +1817,11 @@ namespace LLInitParam
 			mValidated(false)
 		{}
 
-		bool deserializeBlock(Parser& parser, Parser::name_stack_range_t name_stack, S32 generation)
+		bool deserializeBlock(Parser& parser, Parser::name_stack_range_t name_stack_range, bool new_name)
 		{
 			derived_t& typed_param = static_cast<derived_t&>(*this);
 			// try to parse direct value T
-			if (name_stack.first == name_stack.second)
+			if (name_stack_range.first == name_stack_range.second)
 			{
 				if(parser.readValue(typed_param.mValue))
 				{
@@ -1834,10 +1835,10 @@ namespace LLInitParam
 			}
 
 			// fall back on parsing block components for T
-			return typed_param.BaseBlock::deserializeBlock(parser, name_stack, generation);
+			return typed_param.BaseBlock::deserializeBlock(parser, name_stack_range, new_name);
 		}
 
-		void serializeBlock(Parser& parser, Parser::name_stack_t name_stack = Parser::name_stack_t(), const BaseBlock* diff_block = NULL) const
+		void serializeBlock(Parser& parser, Parser::name_stack_t& name_stack, const BaseBlock* diff_block = NULL) const
 		{
 			const derived_t& typed_param = static_cast<const derived_t&>(*this);
 			const derived_t* diff_param = static_cast<const derived_t*>(diff_block);
@@ -1955,6 +1956,16 @@ namespace LLInitParam
 			return mValue;
 		}
 
+		operator value_assignment_t() const
+		{
+			return getValue();
+		}
+
+		value_assignment_t operator()() const
+		{
+			return getValue();
+		}
+
 		S32 				mKeyVersion;
 
 	protected:
@@ -1965,30 +1976,29 @@ namespace LLInitParam
 			mValue = value;
 		}
 
-		bool mergeBlockParam(bool param_provided, BlockDescriptor& block_data, const BaseBlock& other, bool overwrite)
+		bool mergeBlockParam(bool source_provided, bool dst_provided, BlockDescriptor& block_data, const BaseBlock& source, bool overwrite)
 		{
-			if (param_provided)
-			{
-				return mergeBlock(block_data, other, overwrite);
-			}
-			return false;
-		}
+			bool source_override = source_provided && (overwrite || !dst_provided);
 
-		bool mergeBlock(BlockDescriptor& block_data, const BaseBlock& other, bool overwrite)
-		{
-			const derived_t& src_typed_param = static_cast<const derived_t&>(other);
+			const derived_t& src_typed_param = static_cast<const derived_t&>(source);
 
-			if (src_typed_param.mValueAge == VALUE_AUTHORITATIVE)
+			if (source_override && src_typed_param.mValueAge == VALUE_AUTHORITATIVE)
 			{
 				// copy value over
 				setValue(src_typed_param.getValue());
 				return true;
 			}
-			else
+			// merge individual parameters into destination
+			if (mValueAge == VALUE_AUTHORITATIVE)
 			{
-				// merge individual parameters into destination
-				return block_t::mergeBlock(block_t::selfBlockDescriptor(), src_typed_param, overwrite);
+				static_cast<derived_t*>(this)->updateBlockFromValue(dst_provided);
 			}
+			return mergeBlock(block_data, source, overwrite);
+		}
+
+		bool mergeBlock(BlockDescriptor& block_data, const BaseBlock& source, bool overwrite)
+		{
+			return block_t::mergeBlock(block_data, source, overwrite);
 		}
 
 		mutable S32			mValidatedVersion;
diff --git a/indra/llxuixml/llxuiparser.cpp b/indra/llxuixml/llxuiparser.cpp
index 4af077b22c..d4556113ea 100644
--- a/indra/llxuixml/llxuiparser.cpp
+++ b/indra/llxuixml/llxuiparser.cpp
@@ -51,6 +51,136 @@ static 	LLInitParam::Parser::parser_read_func_map_t sXSDReadFuncs;
 static 	LLInitParam::Parser::parser_write_func_map_t sXSDWriteFuncs;
 static 	LLInitParam::Parser::parser_inspect_func_map_t sXSDInspectFuncs;
 
+struct MaxOccur : public LLInitParam::ChoiceBlock<MaxOccur>
+{
+	Alternative<int> count;
+	Alternative<std::string> unbounded;
+
+	MaxOccur()
+	:	unbounded("", "unbounded")
+	{}
+};
+
+struct Occurs : public LLInitParam::Block<Occurs>
+{
+	Optional<S32>	minOccurs;
+	Optional<MaxOccur>	maxOccurs;
+
+	Occurs()
+	:	minOccurs("minOccurs"),
+		maxOccurs("maxOccurs")
+	{
+		minOccurs = 0;
+		maxOccurs.unbounded.choose();
+	}
+};
+
+
+typedef enum
+{
+	USE_REQUIRED,
+	USE_OPTIONAL
+} EUse;
+
+namespace LLInitParam
+{
+	template<>
+	struct TypeValues<EUse> : public TypeValuesHelper<EUse>
+	{
+		static void declareValues()
+		{
+			declare("required", USE_REQUIRED);
+			declare("optional", USE_OPTIONAL);
+		}
+	};
+}
+
+struct Name : public LLInitParam::Block<Name>
+{
+	Mandatory<std::string> name;
+
+	Name()
+	:	name("name")
+	{}
+};
+
+struct Attribute : public LLInitParam::Block<Attribute>
+{
+	Mandatory<Name>			name;
+	Mandatory<std::string>	type;
+	Mandatory<EUse>			use;
+	
+	Attribute()
+	:	name("name"),
+		type("type"),
+		use("use")
+	{
+	}
+};
+
+struct ComplexType : public LLInitParam::Block<ComplexType>
+{
+	Multiple<Attribute>			attribute;
+	//Multiple<struct Element>	elements;
+	Optional<bool>				mixed;
+
+	ComplexType()
+	:	attribute("xs:attribute"),
+		//elements("xs:element"),
+		mixed("mixed")
+	{
+		mixed = true;
+	}
+};
+
+struct Element : public LLInitParam::Block<Element, Occurs>
+{
+	Mandatory<ComplexType>	complexType;
+	Mandatory<Name>			name;
+
+	Element()
+	:	complexType("xs:complexType")
+	{}
+};
+
+struct Elements : public LLInitParam::Block<Elements, Occurs>
+{
+	Multiple<Element> elements;
+
+	Elements()
+	:	elements("xs:element")
+	{}
+};
+
+struct Schema : public LLInitParam::Block<Schema>
+{
+private:
+	Mandatory<std::string>	targetNamespace,
+							xmlns;
+
+public:
+	Optional<std::string>	attributeFormDefault,
+							elementFormDefault,
+							xs;
+
+	Optional<Elements>		elements;
+	
+	void setNameSpace(const std::string& ns) {targetNamespace = ns; xmlns = ns;}
+
+	Schema()
+	:	attributeFormDefault("attributeFormDefault"),
+		elementFormDefault("elementFormDefault"),
+		xs("xmlns:xs"),
+		targetNamespace("targetNamespace"),
+		xmlns("xmlns"),
+		elements("xs:choice")
+	{
+		attributeFormDefault = "unqualified";
+		elementFormDefault = "qualified";
+		xs = "http://www.w3.org/2001/XMLSchema";
+	}
+
+};
 
 //
 // LLXSDWriter
@@ -383,12 +513,11 @@ static 	LLInitParam::Parser::parser_inspect_func_map_t sXUIInspectFuncs;
 //
 LLXUIParser::LLXUIParser()
 :	Parser(sXUIReadFuncs, sXUIWriteFuncs, sXUIInspectFuncs),
-	mLastWriteGeneration(-1),
 	mCurReadDepth(0)
 {
 	if (sXUIReadFuncs.empty())
 	{
-		registerParserFuncs<LLInitParam::NoParamValue>(readNoValue, writeNoValue);
+		registerParserFuncs<LLInitParam::Flag>(readFlag, writeFlag);
 		registerParserFuncs<bool>(readBoolValue, writeBoolValue);
 		registerParserFuncs<std::string>(readStringValue, writeStringValue);
 		registerParserFuncs<U8>(readU8Value, writeU8Value);
@@ -453,7 +582,7 @@ bool LLXUIParser::readXUIImpl(LLXMLNodePtr nodep, LLInitParam::BaseBlock& block)
 	if (!text_contents.empty())
 	{
 		mCurReadNode = nodep;
-		mNameStack.push_back(std::make_pair(std::string("value"), newParseGeneration()));
+		mNameStack.push_back(std::make_pair(std::string("value"), true));
 		// child nodes are not necessarily valid parameters (could be a child widget)
 		// so don't complain once we've recursed
 		if (!block.submitValue(mNameStack, *this, true))
@@ -488,7 +617,7 @@ bool LLXUIParser::readXUIImpl(LLXMLNodePtr nodep, LLInitParam::BaseBlock& block)
 		// since there is no widget named "rect"
 		if (child_name.find(".") == std::string::npos) 
 		{
-			mNameStack.push_back(std::make_pair(child_name, newParseGeneration()));
+			mNameStack.push_back(std::make_pair(child_name, true));
 			num_tokens_pushed++;
 		}
 		else
@@ -524,7 +653,7 @@ bool LLXUIParser::readXUIImpl(LLXMLNodePtr nodep, LLInitParam::BaseBlock& block)
 			// copy remaining tokens on to our running token list
 			for(tokenizer::iterator token_to_push = name_token_it; token_to_push != name_tokens.end(); ++token_to_push)
 			{
-				mNameStack.push_back(std::make_pair(*token_to_push, newParseGeneration()));
+				mNameStack.push_back(std::make_pair(*token_to_push, true));
 				num_tokens_pushed++;
 			}
 		}
@@ -574,7 +703,7 @@ bool LLXUIParser::readAttributes(LLXMLNodePtr nodep, LLInitParam::BaseBlock& blo
 		// copy remaining tokens on to our running token list
 		for(tokenizer::iterator token_to_push = name_tokens.begin(); token_to_push != name_tokens.end(); ++token_to_push)
 		{
-			mNameStack.push_back(std::make_pair(*token_to_push, newParseGeneration()));
+			mNameStack.push_back(std::make_pair(*token_to_push, true));
 			num_tokens_pushed++;
 		}
 
@@ -593,48 +722,40 @@ bool LLXUIParser::readAttributes(LLXMLNodePtr nodep, LLInitParam::BaseBlock& blo
 void LLXUIParser::writeXUI(LLXMLNodePtr node, const LLInitParam::BaseBlock &block, const LLInitParam::BaseBlock* diff_block)
 {
 	mWriteRootNode = node;
-	block.serializeBlock(*this, Parser::name_stack_t(), diff_block);
+	name_stack_t name_stack = Parser::name_stack_t();
+	block.serializeBlock(*this, name_stack, diff_block);
 	mOutNodes.clear();
 }
 
 // go from a stack of names to a specific XML node
-LLXMLNodePtr LLXUIParser::getNode(const name_stack_t& stack)
+LLXMLNodePtr LLXUIParser::getNode(name_stack_t& stack)
 {
-	name_stack_t name_stack;
-	for (name_stack_t::const_iterator it = stack.begin();
-		it != stack.end();
-		++it)
-	{
-		if (!it->first.empty())
-		{
-			name_stack.push_back(*it);
-		}
-	}
-
 	LLXMLNodePtr out_node = mWriteRootNode;
 
-	name_stack_t::const_iterator next_it = name_stack.begin();
-	for (name_stack_t::const_iterator it = name_stack.begin();
-		it != name_stack.end();
+	name_stack_t::iterator next_it = stack.begin();
+	for (name_stack_t::iterator it = stack.begin();
+		it != stack.end();
 		it = next_it)
 	{
 		++next_it;
 		if (it->first.empty())
 		{
+			it->second = false;
 			continue;
 		}
 
-		out_nodes_t::iterator found_it = mOutNodes.lower_bound(it->second);
+		out_nodes_t::iterator found_it = mOutNodes.find(it->first);
 
 		// node with this name not yet written
-		if (found_it == mOutNodes.end() || mOutNodes.key_comp()(found_it->first, it->second))
+		if (found_it == mOutNodes.end() || it->second)
 		{
 			// make an attribute if we are the last element on the name stack
-			bool is_attribute = next_it == name_stack.end();
+			bool is_attribute = next_it == stack.end();
 			LLXMLNodePtr new_node = new LLXMLNode(it->first.c_str(), is_attribute);
 			out_node->addChild(new_node);
-			mOutNodes.insert(found_it, std::make_pair(it->second, new_node));
+			mOutNodes[it->first] = new_node;
 			out_node = new_node;
+			it->second = false;
 		}
 		else
 		{
@@ -645,13 +766,13 @@ LLXMLNodePtr LLXUIParser::getNode(const name_stack_t& stack)
 	return (out_node == mWriteRootNode ? LLXMLNodePtr(NULL) : out_node);
 }
 
-bool LLXUIParser::readNoValue(Parser& parser, void* val_ptr)
+bool LLXUIParser::readFlag(Parser& parser, void* val_ptr)
 {
 	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
 	return self.mCurReadNode == DUMMY_NODE;
 }
 
-bool LLXUIParser::writeNoValue(Parser& parser, const void* val_ptr, const name_stack_t& stack)
+bool LLXUIParser::writeFlag(Parser& parser, const void* val_ptr, name_stack_t& stack)
 {
 	// just create node
 	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
@@ -668,7 +789,7 @@ bool LLXUIParser::readBoolValue(Parser& parser, void* val_ptr)
 	return success;
 }
 
-bool LLXUIParser::writeBoolValue(Parser& parser, const void* val_ptr, const name_stack_t& stack)
+bool LLXUIParser::writeBoolValue(Parser& parser, const void* val_ptr, name_stack_t& stack)
 {
 	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
 	LLXMLNodePtr node = self.getNode(stack);
@@ -687,7 +808,7 @@ bool LLXUIParser::readStringValue(Parser& parser, void* val_ptr)
 	return true;
 }
 
-bool LLXUIParser::writeStringValue(Parser& parser, const void* val_ptr, const name_stack_t& stack)
+bool LLXUIParser::writeStringValue(Parser& parser, const void* val_ptr, name_stack_t& stack)
 {
 	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
 	LLXMLNodePtr node = self.getNode(stack);
@@ -725,7 +846,7 @@ bool LLXUIParser::readU8Value(Parser& parser, void* val_ptr)
 	return self.mCurReadNode->getByteValue(1, (U8*)val_ptr);
 }
 
-bool LLXUIParser::writeU8Value(Parser& parser, const void* val_ptr, const name_stack_t& stack)
+bool LLXUIParser::writeU8Value(Parser& parser, const void* val_ptr, name_stack_t& stack)
 {
 	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
 	LLXMLNodePtr node = self.getNode(stack);
@@ -749,7 +870,7 @@ bool LLXUIParser::readS8Value(Parser& parser, void* val_ptr)
 	return false;
 }
 
-bool LLXUIParser::writeS8Value(Parser& parser, const void* val_ptr, const name_stack_t& stack)
+bool LLXUIParser::writeS8Value(Parser& parser, const void* val_ptr, name_stack_t& stack)
 {
 	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
 	LLXMLNodePtr node = self.getNode(stack);
@@ -773,7 +894,7 @@ bool LLXUIParser::readU16Value(Parser& parser, void* val_ptr)
 	return false;
 }
 
-bool LLXUIParser::writeU16Value(Parser& parser, const void* val_ptr, const name_stack_t& stack)
+bool LLXUIParser::writeU16Value(Parser& parser, const void* val_ptr, name_stack_t& stack)
 {
 	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
 	LLXMLNodePtr node = self.getNode(stack);
@@ -797,7 +918,7 @@ bool LLXUIParser::readS16Value(Parser& parser, void* val_ptr)
 	return false;
 }
 
-bool LLXUIParser::writeS16Value(Parser& parser, const void* val_ptr, const name_stack_t& stack)
+bool LLXUIParser::writeS16Value(Parser& parser, const void* val_ptr, name_stack_t& stack)
 {
 	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
 	LLXMLNodePtr node = self.getNode(stack);
@@ -815,7 +936,7 @@ bool LLXUIParser::readU32Value(Parser& parser, void* val_ptr)
 	return self.mCurReadNode->getUnsignedValue(1, (U32*)val_ptr);
 }
 
-bool LLXUIParser::writeU32Value(Parser& parser, const void* val_ptr, const name_stack_t& stack)
+bool LLXUIParser::writeU32Value(Parser& parser, const void* val_ptr, name_stack_t& stack)
 {
 	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
 	LLXMLNodePtr node = self.getNode(stack);
@@ -833,7 +954,7 @@ bool LLXUIParser::readS32Value(Parser& parser, void* val_ptr)
 	return self.mCurReadNode->getIntValue(1, (S32*)val_ptr);
 }
 
-bool LLXUIParser::writeS32Value(Parser& parser, const void* val_ptr, const name_stack_t& stack)
+bool LLXUIParser::writeS32Value(Parser& parser, const void* val_ptr, name_stack_t& stack)
 {
 	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
 	LLXMLNodePtr node = self.getNode(stack);
@@ -851,7 +972,7 @@ bool LLXUIParser::readF32Value(Parser& parser, void* val_ptr)
 	return self.mCurReadNode->getFloatValue(1, (F32*)val_ptr);
 }
 
-bool LLXUIParser::writeF32Value(Parser& parser, const void* val_ptr, const name_stack_t& stack)
+bool LLXUIParser::writeF32Value(Parser& parser, const void* val_ptr, name_stack_t& stack)
 {
 	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
 	LLXMLNodePtr node = self.getNode(stack);
@@ -869,7 +990,7 @@ bool LLXUIParser::readF64Value(Parser& parser, void* val_ptr)
 	return self.mCurReadNode->getDoubleValue(1, (F64*)val_ptr);
 }
 
-bool LLXUIParser::writeF64Value(Parser& parser, const void* val_ptr, const name_stack_t& stack)
+bool LLXUIParser::writeF64Value(Parser& parser, const void* val_ptr, name_stack_t& stack)
 {
 	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
 	LLXMLNodePtr node = self.getNode(stack);
@@ -893,7 +1014,7 @@ bool LLXUIParser::readColor4Value(Parser& parser, void* val_ptr)
 	return false;
 }
 
-bool LLXUIParser::writeColor4Value(Parser& parser, const void* val_ptr, const name_stack_t& stack)
+bool LLXUIParser::writeColor4Value(Parser& parser, const void* val_ptr, name_stack_t& stack)
 {
 	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
 	LLXMLNodePtr node = self.getNode(stack);
@@ -920,7 +1041,7 @@ bool LLXUIParser::readUIColorValue(Parser& parser, void* val_ptr)
 	return false;
 }
 
-bool LLXUIParser::writeUIColorValue(Parser& parser, const void* val_ptr, const name_stack_t& stack)
+bool LLXUIParser::writeUIColorValue(Parser& parser, const void* val_ptr, name_stack_t& stack)
 {
 	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
 	LLXMLNodePtr node = self.getNode(stack);
@@ -949,7 +1070,7 @@ bool LLXUIParser::readUUIDValue(Parser& parser, void* val_ptr)
 	return false;
 }
 
-bool LLXUIParser::writeUUIDValue(Parser& parser, const void* val_ptr, const name_stack_t& stack)
+bool LLXUIParser::writeUUIDValue(Parser& parser, const void* val_ptr, name_stack_t& stack)
 {
 	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
 	LLXMLNodePtr node = self.getNode(stack);
@@ -968,7 +1089,7 @@ bool LLXUIParser::readSDValue(Parser& parser, void* val_ptr)
 	return true;
 }
 
-bool LLXUIParser::writeSDValue(Parser& parser, const void* val_ptr, const name_stack_t& stack)
+bool LLXUIParser::writeSDValue(Parser& parser, const void* val_ptr, name_stack_t& stack)
 {
 	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
 
@@ -1077,13 +1198,12 @@ const char* NO_VALUE_MARKER = "no_value";
 
 LLSimpleXUIParser::LLSimpleXUIParser(LLSimpleXUIParser::element_start_callback_t element_cb)
 :	Parser(sSimpleXUIReadFuncs, sSimpleXUIWriteFuncs, sSimpleXUIInspectFuncs),
-	mLastWriteGeneration(-1),
 	mCurReadDepth(0),
 	mElementCB(element_cb)
 {
 	if (sSimpleXUIReadFuncs.empty())
 	{
-		registerParserFuncs<LLInitParam::NoParamValue>(readNoValue);
+		registerParserFuncs<LLInitParam::Flag>(readFlag);
 		registerParserFuncs<bool>(readBoolValue);
 		registerParserFuncs<std::string>(readStringValue);
 		registerParserFuncs<U8>(readU8Value);
@@ -1208,7 +1328,7 @@ void LLSimpleXUIParser::startElement(const char *name, const char **atts)
 	{	// compound attribute
 		if (child_name.find(".") == std::string::npos) 
 		{
-			mNameStack.push_back(std::make_pair(child_name, newParseGeneration()));
+			mNameStack.push_back(std::make_pair(child_name, true));
 			num_tokens_pushed++;
 			mScope.push_back(child_name);
 		}
@@ -1235,7 +1355,7 @@ void LLSimpleXUIParser::startElement(const char *name, const char **atts)
 			// copy remaining tokens on to our running token list
 			for(tokenizer::iterator token_to_push = name_token_it; token_to_push != name_tokens.end(); ++token_to_push)
 			{
-				mNameStack.push_back(std::make_pair(*token_to_push, newParseGeneration()));
+				mNameStack.push_back(std::make_pair(*token_to_push, true));
 				num_tokens_pushed++;
 			}
 			mScope.push_back(mNameStack.back().first);
@@ -1268,7 +1388,7 @@ bool LLSimpleXUIParser::readAttributes(const char **atts)
 		// copy remaining tokens on to our running token list
 		for(tokenizer::iterator token_to_push = name_tokens.begin(); token_to_push != name_tokens.end(); ++token_to_push)
 		{
-			mNameStack.push_back(std::make_pair(*token_to_push, newParseGeneration()));
+			mNameStack.push_back(std::make_pair(*token_to_push, true));
 			num_tokens_pushed++;
 		}
 
@@ -1290,7 +1410,7 @@ bool LLSimpleXUIParser::processText()
 		LLStringUtil::trim(mTextContents);
 		if (!mTextContents.empty())
 		{
-			mNameStack.push_back(std::make_pair(std::string("value"), newParseGeneration()));
+			mNameStack.push_back(std::make_pair(std::string("value"), true));
 			mCurAttributeValueBegin = mTextContents.c_str();
 			mOutputStack.back().first->submitValue(mNameStack, *this, mParseSilently);
 			mNameStack.pop_back();
@@ -1376,7 +1496,7 @@ void LLSimpleXUIParser::parserError(const std::string& message)
 #endif
 }
 
-bool LLSimpleXUIParser::readNoValue(Parser& parser, void* val_ptr)
+bool LLSimpleXUIParser::readFlag(Parser& parser, void* val_ptr)
 {
 	LLSimpleXUIParser& self = static_cast<LLSimpleXUIParser&>(parser);
 	return self.mCurAttributeValueBegin == NO_VALUE_MARKER;
diff --git a/indra/llxuixml/llxuiparser.h b/indra/llxuixml/llxuiparser.h
index 0c38c4da93..d7cd256967 100644
--- a/indra/llxuixml/llxuiparser.h
+++ b/indra/llxuixml/llxuiparser.h
@@ -116,7 +116,7 @@ private:
 	bool readAttributes(LLXMLNodePtr nodep, LLInitParam::BaseBlock& block);
 
 	//reader helper functions
-	static bool readNoValue(Parser& parser, void* val_ptr);
+	static bool readFlag(Parser& parser, void* val_ptr);
 	static bool readBoolValue(Parser& parser, void* val_ptr);
 	static bool readStringValue(Parser& parser, void* val_ptr);
 	static bool readU8Value(Parser& parser, void* val_ptr);
@@ -133,23 +133,23 @@ private:
 	static bool readSDValue(Parser& parser, void* val_ptr);
 
 	//writer helper functions
-	static bool writeNoValue(Parser& parser, const void* val_ptr, const name_stack_t&);
-	static bool writeBoolValue(Parser& parser, const void* val_ptr, const name_stack_t&);
-	static bool writeStringValue(Parser& parser, const void* val_ptr, const name_stack_t&);
-	static bool writeU8Value(Parser& parser, const void* val_ptr, const name_stack_t&);
-	static bool writeS8Value(Parser& parser, const void* val_ptr, const name_stack_t&);
-	static bool writeU16Value(Parser& parser, const void* val_ptr, const name_stack_t&);
-	static bool writeS16Value(Parser& parser, const void* val_ptr, const name_stack_t&);
-	static bool writeU32Value(Parser& parser, const void* val_ptr, const name_stack_t&);
-	static bool writeS32Value(Parser& parser, const void* val_ptr, const name_stack_t&);
-	static bool writeF32Value(Parser& parser, const void* val_ptr, const name_stack_t&);
-	static bool writeF64Value(Parser& parser, const void* val_ptr, const name_stack_t&);
-	static bool writeColor4Value(Parser& parser, const void* val_ptr, const name_stack_t&);
-	static bool writeUIColorValue(Parser& parser, const void* val_ptr, const name_stack_t&);
-	static bool writeUUIDValue(Parser& parser, const void* val_ptr, const name_stack_t&);
-	static bool writeSDValue(Parser& parser, const void* val_ptr, const name_stack_t&);
-
-	LLXMLNodePtr getNode(const name_stack_t& stack);
+	static bool writeFlag(Parser& parser, const void* val_ptr, name_stack_t&);
+	static bool writeBoolValue(Parser& parser, const void* val_ptr, name_stack_t&);
+	static bool writeStringValue(Parser& parser, const void* val_ptr, name_stack_t&);
+	static bool writeU8Value(Parser& parser, const void* val_ptr, name_stack_t&);
+	static bool writeS8Value(Parser& parser, const void* val_ptr, name_stack_t&);
+	static bool writeU16Value(Parser& parser, const void* val_ptr, name_stack_t&);
+	static bool writeS16Value(Parser& parser, const void* val_ptr, name_stack_t&);
+	static bool writeU32Value(Parser& parser, const void* val_ptr, name_stack_t&);
+	static bool writeS32Value(Parser& parser, const void* val_ptr, name_stack_t&);
+	static bool writeF32Value(Parser& parser, const void* val_ptr, name_stack_t&);
+	static bool writeF64Value(Parser& parser, const void* val_ptr, name_stack_t&);
+	static bool writeColor4Value(Parser& parser, const void* val_ptr, name_stack_t&);
+	static bool writeUIColorValue(Parser& parser, const void* val_ptr, name_stack_t&);
+	static bool writeUUIDValue(Parser& parser, const void* val_ptr, name_stack_t&);
+	static bool writeSDValue(Parser& parser, const void* val_ptr, name_stack_t&);
+
+	LLXMLNodePtr getNode(name_stack_t& stack);
 
 private:
 	Parser::name_stack_t			mNameStack;
@@ -157,9 +157,8 @@ private:
 	// Root of the widget XML sub-tree, for example, "line_editor"
 	LLXMLNodePtr					mWriteRootNode;
 	
-	typedef std::map<S32, LLXMLNodePtr>	out_nodes_t;
+	typedef std::map<std::string, LLXMLNodePtr>	out_nodes_t;
 	out_nodes_t						mOutNodes;
-	S32								mLastWriteGeneration;
 	LLXMLNodePtr					mLastWrittenChild;
 	S32								mCurReadDepth;
 	std::string						mCurFileName;
@@ -197,7 +196,7 @@ public:
 
 private:
 	//reader helper functions
-	static bool readNoValue(Parser&, void* val_ptr);
+	static bool readFlag(Parser&, void* val_ptr);
 	static bool readBoolValue(Parser&, void* val_ptr);
 	static bool readStringValue(Parser&, void* val_ptr);
 	static bool readU8Value(Parser&, void* val_ptr);
@@ -226,7 +225,6 @@ private:
 
 	Parser::name_stack_t			mNameStack;
 	struct XML_ParserStruct*		mParser;
-	S32								mLastWriteGeneration;
 	LLXMLNodePtr					mLastWrittenChild;
 	S32								mCurReadDepth;
 	std::string						mCurFileName;