diff --git a/src/pugixml.cpp b/src/pugixml.cpp
index 58191ae..c3b9332 100644
--- a/src/pugixml.cpp
+++ b/src/pugixml.cpp
@@ -3709,9 +3709,21 @@ PUGI__NS_BEGIN
 		return (s[0] == '0' && (s[1] == 'x' || s[1] == 'X')) ? 16 : 10;
 	}
 
-	PUGI__FN int get_value_int(const char_t* value, int def)
+	PUGI__FN int get_value_int(const char_t* value, int def, bool* def_set)
 	{
-		if (!value) return def;
+		if (!value)
+		{
+			if(def_set)
+			{
+				*def_set = true;
+			}
+			return def;
+		}
+
+		if(def_set)
+		{
+			*def_set = false;
+		}
 
 		int base = get_integer_base(value);
 
@@ -3722,9 +3734,21 @@ PUGI__NS_BEGIN
 	#endif
 	}
 
-	PUGI__FN unsigned int get_value_uint(const char_t* value, unsigned int def)
+	PUGI__FN unsigned int get_value_uint(const char_t* value, unsigned int def, bool* def_set)
 	{
-		if (!value) return def;
+		if (!value)
+		{
+			if(def_set)
+			{
+				*def_set = true;
+			}
+			return def;
+		}
+
+		if(def_set)
+		{
+			*def_set = false;
+		}
 
 		int base = get_integer_base(value);
 
@@ -3735,9 +3759,21 @@ PUGI__NS_BEGIN
 	#endif
 	}
 
-	PUGI__FN double get_value_double(const char_t* value, double def)
+	PUGI__FN double get_value_double(const char_t* value, double def, bool* def_set)
 	{
-		if (!value) return def;
+		if (!value)
+		{
+			if(def_set)
+			{
+				*def_set = true;
+			}
+			return def;
+		}
+
+		if(def_set)
+		{
+			*def_set = false;
+		}
 
 	#ifdef PUGIXML_WCHAR_MODE
 		return wcstod(value, 0);
@@ -3746,7 +3782,7 @@ PUGI__NS_BEGIN
 	#endif
 	}
 
-	PUGI__FN float get_value_float(const char_t* value, float def)
+	PUGI__FN float get_value_float(const char_t* value, float def, bool* def_set)
 	{
 		if (!value) return def;
 
@@ -3757,9 +3793,21 @@ PUGI__NS_BEGIN
 	#endif
 	}
 
-	PUGI__FN bool get_value_bool(const char_t* value, bool def)
+	PUGI__FN bool get_value_bool(const char_t* value, bool def, bool* def_set)
 	{
-		if (!value) return def;
+		if (!value)
+		{
+			if(def_set)
+			{
+				*def_set = true;
+			}
+			return def;
+		}
+
+		if(def_set)
+		{
+			*def_set = false;
+		}
 
 		// only look at first char
 		char_t first = *value;
@@ -3769,9 +3817,21 @@ PUGI__NS_BEGIN
 	}
 
 #ifdef PUGIXML_HAS_LONG_LONG
-	PUGI__FN long long get_value_llong(const char_t* value, long long def)
+	PUGI__FN long long get_value_llong(const char_t* value, long long def, bool* def_set)
 	{
-		if (!value) return def;
+		if (!value)
+		{
+			if(def_set)
+			{
+				*def_set = true;
+			}
+			return def;
+		}
+
+		if(def_set)
+		{
+			*def_set = false;
+		}
 
 		int base = get_integer_base(value);
 
@@ -3790,9 +3850,21 @@ PUGI__NS_BEGIN
 	#endif
 	}
 
-	PUGI__FN unsigned long long get_value_ullong(const char_t* value, unsigned long long def)
+	PUGI__FN unsigned long long get_value_ullong(const char_t* value, unsigned long long def, bool* def_set)
 	{
-		if (!value) return def;
+		if (!value)
+		{
+			if(def_set)
+			{
+				*def_set = true;
+			}
+			return def;
+		}
+
+		if(def_set)
+		{
+			*def_set = false;
+		}
 
 		int base = get_integer_base(value);
 
@@ -4348,38 +4420,38 @@ namespace pugi
 
 	PUGI__FN int xml_attribute::as_int(int def) const
 	{
-		return impl::get_value_int(_attr ? _attr->value : 0, def);
+		return impl::get_value_int(_attr ? _attr->value : 0, def, NULL);
 	}
 
 	PUGI__FN unsigned int xml_attribute::as_uint(unsigned int def) const
 	{
-		return impl::get_value_uint(_attr ? _attr->value : 0, def);
+		return impl::get_value_uint(_attr ? _attr->value : 0, def, NULL);
 	}
 
 	PUGI__FN double xml_attribute::as_double(double def) const
 	{
-		return impl::get_value_double(_attr ? _attr->value : 0, def);
+		return impl::get_value_double(_attr ? _attr->value : 0, def, NULL);
 	}
 
 	PUGI__FN float xml_attribute::as_float(float def) const
 	{
-		return impl::get_value_float(_attr ? _attr->value : 0, def);
+		return impl::get_value_float(_attr ? _attr->value : 0, def, NULL);
 	}
 
 	PUGI__FN bool xml_attribute::as_bool(bool def) const
 	{
-		return impl::get_value_bool(_attr ? _attr->value : 0, def);
+		return impl::get_value_bool(_attr ? _attr->value : 0, def, NULL);
 	}
 
 #ifdef PUGIXML_HAS_LONG_LONG
 	PUGI__FN long long xml_attribute::as_llong(long long def) const
 	{
-		return impl::get_value_llong(_attr ? _attr->value : 0, def);
+		return impl::get_value_llong(_attr ? _attr->value : 0, def, NULL);
 	}
 
 	PUGI__FN unsigned long long xml_attribute::as_ullong(unsigned long long def) const
 	{
-		return impl::get_value_ullong(_attr ? _attr->value : 0, def);
+		return impl::get_value_ullong(_attr ? _attr->value : 0, def, NULL);
 	}
 #endif
 
@@ -5441,61 +5513,75 @@ namespace pugi
 		return (d && d->value) ? d->value : PUGIXML_TEXT("");
 	}
 
-	PUGI__FN const char_t* xml_text::as_string(const char_t* def) const
+	PUGI__FN const char_t* xml_text::as_string(const char_t* def, bool* def_set) const
 	{
 		xml_node_struct* d = _data();
 
-		return (d && d->value) ? d->value : def;
+		if(d && d->value)
+		{
+			if(def_set)
+			{
+				*def_set = false;
+			}
+			return d->value;
+		}
+
+		if(def_set)
+		{
+			*def_set = true;
+		}
+
+		return def;
 	}
 
-	PUGI__FN int xml_text::as_int(int def) const
+	PUGI__FN int xml_text::as_int(int def, bool* def_set) const
 	{
 		xml_node_struct* d = _data();
 
-		return impl::get_value_int(d ? d->value : 0, def);
+		return impl::get_value_int(d ? d->value : 0, def, def_set);
 	}
 
-	PUGI__FN unsigned int xml_text::as_uint(unsigned int def) const
+	PUGI__FN unsigned int xml_text::as_uint(unsigned int def, bool* def_set) const
 	{
 		xml_node_struct* d = _data();
 
-		return impl::get_value_uint(d ? d->value : 0, def);
+		return impl::get_value_uint(d ? d->value : 0, def, def_set);
 	}
 
-	PUGI__FN double xml_text::as_double(double def) const
+	PUGI__FN double xml_text::as_double(double def, bool* def_set) const
 	{
 		xml_node_struct* d = _data();
 
-		return impl::get_value_double(d ? d->value : 0, def);
+		return impl::get_value_double(d ? d->value : 0, def, def_set);
 	}
 
-	PUGI__FN float xml_text::as_float(float def) const
+	PUGI__FN float xml_text::as_float(float def, bool* def_set) const
 	{
 		xml_node_struct* d = _data();
 
-		return impl::get_value_float(d ? d->value : 0, def);
+		return impl::get_value_float(d ? d->value : 0, def, def_set);
 	}
 
-	PUGI__FN bool xml_text::as_bool(bool def) const
+	PUGI__FN bool xml_text::as_bool(bool def, bool* def_set) const
 	{
 		xml_node_struct* d = _data();
 
-		return impl::get_value_bool(d ? d->value : 0, def);
+		return impl::get_value_bool(d ? d->value : 0, def, def_set);
 	}
 
 #ifdef PUGIXML_HAS_LONG_LONG
-	PUGI__FN long long xml_text::as_llong(long long def) const
+	PUGI__FN long long xml_text::as_llong(long long def, bool* def_set) const
 	{
 		xml_node_struct* d = _data();
 
-		return impl::get_value_llong(d ? d->value : 0, def);
+		return impl::get_value_llong(d ? d->value : 0, def, def_set);
 	}
 
-	PUGI__FN unsigned long long xml_text::as_ullong(unsigned long long def) const
+	PUGI__FN unsigned long long xml_text::as_ullong(unsigned long long def, bool* def_set) const
 	{
 		xml_node_struct* d = _data();
 
-		return impl::get_value_ullong(d ? d->value : 0, def);
+		return impl::get_value_ullong(d ? d->value : 0, def, def_set);
 	}
 #endif
 
diff --git a/src/pugixml.hpp b/src/pugixml.hpp
index 69b2cb2..172afb5 100644
--- a/src/pugixml.hpp
+++ b/src/pugixml.hpp
@@ -666,21 +666,21 @@ namespace pugi
 		const char_t* get() const;
 
 		// Get text, or the default value if object is empty
-		const char_t* as_string(const char_t* def = PUGIXML_TEXT("")) const;
+		const char_t* as_string(const char_t* def = PUGIXML_TEXT(""), bool* def_set = NULL) const;
 
 		// Get text as a number, or the default value if conversion did not succeed or object is empty
-		int as_int(int def = 0) const;
-		unsigned int as_uint(unsigned int def = 0) const;
-		double as_double(double def = 0) const;
-		float as_float(float def = 0) const;
+		int as_int(int def = 0, bool* def_set = NULL) const;
+		unsigned int as_uint(unsigned int def = 0, bool* def_set = NULL) const;
+		double as_double(double def = 0, bool* def_set = NULL) const;
+		float as_float(float def = 0, bool* def_set = NULL) const;
 
 	#ifdef PUGIXML_HAS_LONG_LONG
-		long long as_llong(long long def = 0) const;
-		unsigned long long as_ullong(unsigned long long def = 0) const;
+		long long as_llong(long long def = 0, bool* def_set = NULL) const;
+		unsigned long long as_ullong(unsigned long long def = 0, bool* def_set = NULL) const;
 	#endif
 
 		// Get text as bool (returns true if first character is in '1tTyY' set), or the default value if object is empty
-		bool as_bool(bool def = false) const;
+		bool as_bool(bool def = false, bool* def_set = NULL) const;
 
 		// Set text (returns false if object is empty or there is not enough memory)
 		bool set(const char_t* rhs);