diff --git a/alib2common/src/core/xmlApi.hpp b/alib2common/src/core/xmlApi.hpp
index 322820d6889bc9f65b6ae8ce8e0f7c2b8b111d31..1a7d81bdf9977561ff51cb3c109da5d6afa41b70 100644
--- a/alib2common/src/core/xmlApi.hpp
+++ b/alib2common/src/core/xmlApi.hpp
@@ -32,10 +32,10 @@ class xmlApiInputContext : public std::deque < sax::Token >::iterator {
 	friend struct xmlApi;
 
 	std::map < std::string, std::map < int, void * > > idToInstanceContexts;
-	std::map < std::string, int > idToInstanceMaxContexts;
+	int idMaxContext;
 
 public:
-	xmlApiInputContext ( std::deque < sax::Token >::iterator iter ) : std::deque < sax::Token >::iterator ( iter ) {
+	xmlApiInputContext ( std::deque < sax::Token >::iterator iter ) : std::deque < sax::Token >::iterator ( iter ), idMaxContext ( 0 ) {
 	}
 
 	~xmlApiInputContext ( ) {
@@ -51,11 +51,8 @@ public:
 		return idToInstanceContexts[name];
 	}
 
-	int & idToInstanceMax ( const std::string & name ) {
-		if ( idToInstanceMaxContexts.find ( name ) == idToInstanceMaxContexts.end ( ) )
-			idToInstanceMaxContexts[name] = 0;
-
-		return idToInstanceMaxContexts[name];
+	int & idMax ( ) {
+		return idMaxContext;
 	}
 
 	static std::map < std::string, std::function < void ( void * ) > > & deleteCallbacks ( ) {
@@ -64,6 +61,10 @@ public:
 		return res;
 	}
 
+	const std::map < std::string, std::map < int, void * > > & dump ( ) const {
+		return idToInstanceContexts;
+	}
+
 };
 
 class xmlApiOutputContext : public std::deque < sax::Token > {
@@ -71,18 +72,18 @@ class xmlApiOutputContext : public std::deque < sax::Token > {
 	friend struct xmlApi;
 
 	std::map < std::string, std::map < void *, int > > instanceToIdContexts;
-	std::map < std::string, int > instanceToIdMaxContexts;
+	int idMaxContext;
 
 public:
+	xmlApiOutputContext ( ) : idMaxContext ( 0 ) {
+	}
+
 	std::map < void *, int > & instanceToId ( const std::string & name ) {
 		return instanceToIdContexts[name];
 	}
 
-	int & instanceToIdMax ( const std::string & name ) {
-		if ( instanceToIdMaxContexts.find ( name ) == instanceToIdMaxContexts.end ( ) )
-			instanceToIdMaxContexts[name] = 0;
-
-		return instanceToIdMaxContexts[name];
+	int & idMax ( ) {
+		return idMaxContext;
 	}
 
 };
@@ -127,17 +128,22 @@ public:
 
 	static Group parse ( std::deque < sax::Token >::iterator & data ) {
 		xmlApiInputContext & input = ( xmlApiInputContext & ) data;
+		sax::FromXMLParserHelper::skipAttributes ( input, sax::Token::TokenType::START_ELEMENT );
+
 		const std::string & tagName = sax::FromXMLParserHelper::getTokenData ( input, sax::Token::TokenType::START_ELEMENT );
 
-		if ( /* common::GlobalData::optimizeXml && */ tagName == Group::getXmlTagRefName() ) {
-			sax::FromXMLParserHelper::popToken ( input, sax::Token::TokenType::START_ELEMENT, Group::getXmlTagRefName() );
+		if ( /* common::GlobalData::optimizeXml && */ tagName == "Ref" ) {
+			sax::FromXMLParserHelper::popToken ( input, sax::Token::TokenType::START_ELEMENT, "Ref" );
 			sax::FromXMLParserHelper::popToken ( input, sax::Token::TokenType::START_ATTRIBUTE, "id" );
 			int id = std::from_string < int > ( sax::FromXMLParserHelper::popTokenData ( input, sax::Token::TokenType::CHARACTER ) );
 			sax::FromXMLParserHelper::popToken ( input, sax::Token::TokenType::END_ATTRIBUTE, "id" );
-			sax::FromXMLParserHelper::popToken ( input, sax::Token::TokenType::END_ELEMENT, Group::getXmlTagRefName() );
+			sax::FromXMLParserHelper::popToken ( input, sax::Token::TokenType::END_ELEMENT, "Ref" );
 			std::map < int, void * >::iterator elem = input.idToInstance ( Group::getXmlTagRefName() ).find ( id );
 
-			if ( elem == input.idToInstance ( Group::getXmlTagRefName() ).end ( ) ) throw exception::CommonException ( "XML Inconsistent" );
+			if ( elem == input.idToInstance ( Group::getXmlTagRefName() ).end ( ) ) {
+				std::cerr << input.dump ( ) << std::endl;
+				throw exception::CommonException ( "XML Inconsistent ( id not found " + std::to_string ( id  ) + " )" );
+			}
 
 			return * ( ( Group * ) elem->second );
 		} else {
@@ -145,8 +151,20 @@ public:
 
 			if ( callback == parseFunctions ( ).end ( ) ) throw exception::CommonException ( "Parse callback for " + tagName + " tag not registered." );
 
+			/* find out if this is a base for reference */
+			bool ref = sax::FromXMLParserHelper::isToken ( input + 1, sax::Token::TokenType::START_ATTRIBUTE, "ref" );
+			int id = 0;
+			if ( ref ) {
+				std::deque < sax::Token >::iterator tmp = input + 2;
+				id = std::from_string < int > ( sax::FromXMLParserHelper::popTokenData ( tmp, sax::Token::TokenType::CHARACTER ) );
+			}
+
 			Group * res = new Group ( callback->second->parse ( input ) );
-			input.idToInstance ( Group::getXmlTagRefName() ).insert ( std::make_pair ( input.idToInstanceMax ( Group::getXmlTagRefName() )++, ( void * ) res ) );
+
+			/* if object is a base of reference, register it */
+			if ( ref )
+				input.idToInstance ( Group::getXmlTagRefName() ).insert ( std::make_pair ( id, ( void * ) res ) );
+
 			return * res;
 		}
 	}
@@ -154,7 +172,7 @@ public:
 	static bool first ( const std::deque < sax::Token >::const_iterator & input ) {
 		const std::string & tagName = sax::FromXMLParserHelper::getTokenData ( input, sax::Token::TokenType::START_ELEMENT );
 
-		if ( tagName == Group::getXmlTagRefName() ) return true;
+		if ( tagName == "Ref" ) return true;
 
 		typename std::map < std::string, ParserRegisterBase * >::iterator callback = parseFunctions ( ).find ( tagName );
 
@@ -169,14 +187,30 @@ public:
 		typename std::map < void *, int >::iterator elem = context.instanceToId ( Group::getXmlTagRefName() ).find ( const_cast< void * >(static_cast< const void * > ( & data.getData ( ) ) ) );
 
 		if ( common::GlobalData::optimizeXml && elem != context.instanceToId ( Group::getXmlTagRefName() ).end ( ) ) {
-			output.emplace_back ( Group::getXmlTagRefName(), sax::Token::TokenType::START_ELEMENT );
+			output.emplace_back ( "Ref", sax::Token::TokenType::START_ELEMENT );
 			output.emplace_back ( "id", sax::Token::TokenType::START_ATTRIBUTE );
 			output.emplace_back ( std::to_string ( elem->second ), sax::Token::TokenType::CHARACTER );
 			output.emplace_back ( "id", sax::Token::TokenType::END_ATTRIBUTE );
-			output.emplace_back ( Group::getXmlTagRefName(), sax::Token::TokenType::END_ELEMENT );
+			output.emplace_back ( "Ref", sax::Token::TokenType::END_ELEMENT );
 		} else {
+			/* get current position in token stream */
+			size_t pos = output.size();
+			int id = 0;
+			if ( common::GlobalData::optimizeXml ) {
+				id = context.idMax ( )++;
+			}
+
+			/* encode referenced object */
 			data.getData ( ).compose ( output );
-			context.instanceToId ( Group::getXmlTagRefName() ).insert ( std::make_pair ( const_cast< void * > ( static_cast< const void * > ( & data.getData ( ) ) ), context.instanceToIdMax ( Group::getXmlTagRefName() )++ ) );
+
+			/* emplace referenced attribute */
+			if ( common::GlobalData::optimizeXml ) {
+				output.emplace ( output.begin ( ) + pos + 1, "ref", sax::Token::TokenType::START_ATTRIBUTE );
+				output.emplace ( output.begin ( ) + pos + 2, std::to_string ( id ) , sax::Token::TokenType::CHARACTER );
+				output.emplace ( output.begin ( ) + pos + 3, "ref", sax::Token::TokenType::END_ATTRIBUTE );
+
+				context.instanceToId ( Group::getXmlTagRefName() ).insert ( std::make_pair ( const_cast< void * > ( static_cast< const void * > ( & data.getData ( ) ) ), id ) );
+			}
 		}
 	}
 
diff --git a/alib2common/src/sax/FromXMLParserHelper.cpp b/alib2common/src/sax/FromXMLParserHelper.cpp
index 0130091bdca91ac015463643c458d6840480dfa1..e1ec1ababef9cc8e4167697c0e0fb4af238abf92 100644
--- a/alib2common/src/sax/FromXMLParserHelper.cpp
+++ b/alib2common/src/sax/FromXMLParserHelper.cpp
@@ -12,16 +12,35 @@
 
 namespace sax {
 
-bool FromXMLParserHelper::isToken(const std::deque<Token>::const_iterator& input, Token::TokenType type, const std::string& data) {
+void FromXMLParserHelper::skipAttributes ( std::deque < Token >::const_iterator & input, Token::TokenType type ) {
+	if ( type == sax::Token::TokenType::START_ELEMENT || type == sax::Token::TokenType::END_ELEMENT || type == sax::Token::TokenType::CHARACTER ) {
+		while ( input->getType ( ) == sax::Token::TokenType::START_ATTRIBUTE ) {
+			input += 3; /* skip START, PAYLOAD, END */
+		}
+	}
+}
+
+void FromXMLParserHelper::skipAttributes ( std::deque < Token >::iterator & input, Token::TokenType type ) {
+	if ( type == sax::Token::TokenType::START_ELEMENT || type == sax::Token::TokenType::END_ELEMENT || type == sax::Token::TokenType::CHARACTER ) {
+		while ( input->getType ( ) == sax::Token::TokenType::START_ATTRIBUTE ) {
+			input += 3; /* skip START, PAYLOAD, END */
+		}
+	}
+}
+
+bool FromXMLParserHelper::isToken(std::deque<Token>::const_iterator input, Token::TokenType type, const std::string& data) {
+	skipAttributes ( input, type );
 	return input->getType() == type && input->getData() == data;
 }
 
-bool FromXMLParserHelper::isTokenType(const std::deque<Token>::const_iterator& input, Token::TokenType type) {
+bool FromXMLParserHelper::isTokenType(std::deque<Token>::const_iterator input, Token::TokenType type) {
+	skipAttributes ( input, type );
 	return input->getType() == type;
 }
 
 void FromXMLParserHelper::popToken(std::deque<Token>::iterator& input, Token::TokenType type, const std::string& data) {
 	if (isToken(input, type, data)) {
+		skipAttributes ( input, type );
 		++input;
 	} else {
 		throw ParserException(Token(data, type), *input);
@@ -30,6 +49,7 @@ void FromXMLParserHelper::popToken(std::deque<Token>::iterator& input, Token::To
 
 std::string FromXMLParserHelper::popTokenData(std::deque<Token>::iterator& input, Token::TokenType type) {
 	if(isTokenType(input, type)) {
+		skipAttributes ( input, type );
 		std::string result = std::move(*input).moveData();
 		++input;
 		return result;
@@ -38,8 +58,9 @@ std::string FromXMLParserHelper::popTokenData(std::deque<Token>::iterator& input
 	}
 }
 
-std::string FromXMLParserHelper::getTokenData(const std::deque<Token>::const_iterator& input, Token::TokenType type) {
+std::string FromXMLParserHelper::getTokenData(std::deque<Token>::const_iterator input, Token::TokenType type) {
 	if(isTokenType(input, type)) {
+		skipAttributes ( input, type );
 		return input->getData();
 	} else {
 		throw ParserException(Token("?", type), *input);
diff --git a/alib2common/src/sax/FromXMLParserHelper.h b/alib2common/src/sax/FromXMLParserHelper.h
index 3b5526935cffc4c91b9507140ed134ae879090b1..f91a588facf64a507a4669ac701f049cd0d292cf 100644
--- a/alib2common/src/sax/FromXMLParserHelper.h
+++ b/alib2common/src/sax/FromXMLParserHelper.h
@@ -21,15 +21,18 @@ namespace sax {
  */
 class FromXMLParserHelper {
 public:
-	static bool isToken(const std::deque<Token>::const_iterator& input, Token::TokenType type, const std::string& data);
-	static bool isTokenType(const std::deque<Token>::const_iterator& input, Token::TokenType type);
+	static bool isToken(std::deque<Token>::const_iterator input, Token::TokenType type, const std::string& data);
+	static bool isTokenType(std::deque<Token>::const_iterator input, Token::TokenType type);
 	static void popToken(std::deque<Token>::iterator& input, Token::TokenType type, const std::string& data);
 	static std::string popTokenData(std::deque<Token>::iterator& input, Token::TokenType type);
-	static std::string getTokenData(const std::deque<Token>::const_iterator& input, Token::TokenType type);
+	static std::string getTokenData(std::deque<Token>::const_iterator input, Token::TokenType type);
 
 	static std::deque < std::deque < sax::Token > > parseInput(bool needSingle, /*const*/ TCLAP::MultiArg < std::string >& input);
 	static std::deque < sax::Token > parseInput(/*const*/ TCLAP::ValueArg < std::string >& input);
 
+	static void skipAttributes ( std::deque < Token >::const_iterator & input, Token::TokenType type );
+	static void skipAttributes ( std::deque < Token >::iterator & input, Token::TokenType type );
+
 private:
 	static std::deque< sax::Token > parseSingle(const std::string& input);
 };
diff --git a/alib2common/test-src/container/ContainerTest.cpp b/alib2common/test-src/container/ContainerTest.cpp
index 9b13ac1f24088ba8df768cec8aab2c37eb68df82..18080680a42886ce418ea97467168cc1b196cc46 100644
--- a/alib2common/test-src/container/ContainerTest.cpp
+++ b/alib2common/test-src/container/ContainerTest.cpp
@@ -39,6 +39,9 @@ void ContainerTest::testXMLParser ( ) {
 
 	{
 		std::string tmp2 = alib::XmlDataFactory::toString ( object );
+
+		std::cout << tmp2 << std::endl;
+
 		alib::Object object2 = alib::XmlDataFactory::fromString < alib::Object > ( tmp2 );
 
 		CPPUNIT_ASSERT ( object == object2 );
@@ -46,7 +49,11 @@ void ContainerTest::testXMLParser ( ) {
 		std::set < primitive::String > concrete = alib::XmlDataFactory::fromString < std::set < primitive::String > > ( tmp2 );
 		std::string tmp3 = alib::XmlDataFactory::toString ( concrete );
 
-		CPPUNIT_ASSERT ( tmp2 == tmp3 );
+		std::cout << tmp3 << std::endl;
+
+		alib::Object object3 = alib::XmlDataFactory::fromString < alib::Object > ( tmp3 );
+
+		CPPUNIT_ASSERT ( object == object3 );
 	}
 }
 
diff --git a/examples2/automaton/NPDA1.DET.xml b/examples2/automaton/NPDA1.DET.xml
index 344e0f9a918828fe62c30554b5aad43c993eb4a8..d0cd70b9208e0478d4197dfe8ed9c15cd995a053 100644
--- a/examples2/automaton/NPDA1.DET.xml
+++ b/examples2/automaton/NPDA1.DET.xml
@@ -1,4300 +1,4300 @@
 <?xml version="1.0"?>
-<DPDA>
+<DPDA ref="0">
   <states>
-    <Integer>0</Integer>
-    <Integer>1</Integer>
-    <Integer>2</Integer>
-    <Integer>3</Integer>
-    <Integer>4</Integer>
-    <Integer>5</Integer>
-    <Integer>6</Integer>
-    <Integer>7</Integer>
-    <Integer>8</Integer>
-    <Integer>9</Integer>
-    <Integer>10</Integer>
-    <Integer>11</Integer>
-    <Integer>12</Integer>
-    <Integer>13</Integer>
-    <Integer>14</Integer>
-    <Integer>15</Integer>
-    <Integer>16</Integer>
-    <Integer>17</Integer>
+    <Integer ref="1">0</Integer>
+    <Integer ref="2">1</Integer>
+    <Integer ref="3">2</Integer>
+    <Integer ref="4">3</Integer>
+    <Integer ref="5">4</Integer>
+    <Integer ref="6">5</Integer>
+    <Integer ref="7">6</Integer>
+    <Integer ref="8">7</Integer>
+    <Integer ref="9">8</Integer>
+    <Integer ref="10">9</Integer>
+    <Integer ref="11">10</Integer>
+    <Integer ref="12">11</Integer>
+    <Integer ref="13">12</Integer>
+    <Integer ref="14">13</Integer>
+    <Integer ref="15">14</Integer>
+    <Integer ref="16">15</Integer>
+    <Integer ref="17">16</Integer>
+    <Integer ref="18">17</Integer>
   </states>
   <inputAlphabet>
-    <LabeledSymbol>
-      <PrimitiveLabel>
-        <String>a0</String>
+    <LabeledSymbol ref="19">
+      <PrimitiveLabel ref="20">
+        <String ref="21">a0</String>
       </PrimitiveLabel>
     </LabeledSymbol>
-    <LabeledSymbol>
-      <PrimitiveLabel>
-        <String>a1</String>
+    <LabeledSymbol ref="22">
+      <PrimitiveLabel ref="23">
+        <String ref="24">a1</String>
       </PrimitiveLabel>
     </LabeledSymbol>
-    <LabeledSymbol>
-      <PrimitiveLabel>
-        <String>a2</String>
+    <LabeledSymbol ref="25">
+      <PrimitiveLabel ref="26">
+        <String ref="27">a2</String>
       </PrimitiveLabel>
     </LabeledSymbol>
   </inputAlphabet>
   <pushdownStoreAlphabet>
-    <Integer>0</Integer>
-    <Integer>1</Integer>
-    <Integer>2</Integer>
-    <Integer>3</Integer>
-    <Integer>4</Integer>
-    <Integer>5</Integer>
-    <Integer>6</Integer>
-    <Integer>7</Integer>
-    <Integer>8</Integer>
-    <Integer>9</Integer>
-    <Integer>10</Integer>
-    <Integer>11</Integer>
-    <Integer>12</Integer>
-    <Integer>13</Integer>
-    <Integer>14</Integer>
-    <Integer>15</Integer>
-    <Integer>16</Integer>
-    <Integer>17</Integer>
-    <Integer>18</Integer>
-    <Integer>19</Integer>
-    <Integer>20</Integer>
-    <Integer>21</Integer>
-    <Integer>22</Integer>
-    <Integer>23</Integer>
-    <Integer>24</Integer>
-    <Integer>25</Integer>
-    <Integer>26</Integer>
-    <Integer>27</Integer>
-    <Integer>28</Integer>
-    <Integer>29</Integer>
-    <Integer>30</Integer>
-    <Integer>31</Integer>
-    <Integer>32</Integer>
-    <Integer>33</Integer>
-    <Integer>34</Integer>
-    <Integer>35</Integer>
-    <Integer>36</Integer>
-    <Integer>37</Integer>
-    <Integer>38</Integer>
-    <Integer>39</Integer>
-    <Integer>40</Integer>
-    <Integer>41</Integer>
+    <Integer ref="28">0</Integer>
+    <Integer ref="29">1</Integer>
+    <Integer ref="30">2</Integer>
+    <Integer ref="31">3</Integer>
+    <Integer ref="32">4</Integer>
+    <Integer ref="33">5</Integer>
+    <Integer ref="34">6</Integer>
+    <Integer ref="35">7</Integer>
+    <Integer ref="36">8</Integer>
+    <Integer ref="37">9</Integer>
+    <Integer ref="38">10</Integer>
+    <Integer ref="39">11</Integer>
+    <Integer ref="40">12</Integer>
+    <Integer ref="41">13</Integer>
+    <Integer ref="42">14</Integer>
+    <Integer ref="43">15</Integer>
+    <Integer ref="44">16</Integer>
+    <Integer ref="45">17</Integer>
+    <Integer ref="46">18</Integer>
+    <Integer ref="47">19</Integer>
+    <Integer ref="48">20</Integer>
+    <Integer ref="49">21</Integer>
+    <Integer ref="50">22</Integer>
+    <Integer ref="51">23</Integer>
+    <Integer ref="52">24</Integer>
+    <Integer ref="53">25</Integer>
+    <Integer ref="54">26</Integer>
+    <Integer ref="55">27</Integer>
+    <Integer ref="56">28</Integer>
+    <Integer ref="57">29</Integer>
+    <Integer ref="58">30</Integer>
+    <Integer ref="59">31</Integer>
+    <Integer ref="60">32</Integer>
+    <Integer ref="61">33</Integer>
+    <Integer ref="62">34</Integer>
+    <Integer ref="63">35</Integer>
+    <Integer ref="64">36</Integer>
+    <Integer ref="65">37</Integer>
+    <Integer ref="66">38</Integer>
+    <Integer ref="67">39</Integer>
+    <Integer ref="68">40</Integer>
+    <Integer ref="69">41</Integer>
   </pushdownStoreAlphabet>
   <initialState>
-    <ObjectRef id="0"/>
+    <Ref id="1"/>
   </initialState>
   <initialPushdownStoreSymbol>
-    <Integer>0</Integer>
+    <Integer ref="70">0</Integer>
   </initialPushdownStoreSymbol>
   <finalStates>
-    <ObjectRef id="11"/>
-    <ObjectRef id="12"/>
-    <ObjectRef id="13"/>
-    <ObjectRef id="14"/>
-    <ObjectRef id="15"/>
-    <ObjectRef id="16"/>
-    <ObjectRef id="17"/>
+    <Ref id="12"/>
+    <Ref id="13"/>
+    <Ref id="14"/>
+    <Ref id="15"/>
+    <Ref id="16"/>
+    <Ref id="17"/>
+    <Ref id="18"/>
   </finalStates>
   <transitions>
     <transition>
       <from>
-        <ObjectRef id="0"/>
+        <Ref id="1"/>
       </from>
       <input>
-        <ObjectRef id="18"/>
+        <Ref id="19"/>
       </input>
       <pop>
-        <Integer>0</Integer>
+        <Integer ref="71">0</Integer>
       </pop>
       <to>
-        <ObjectRef id="1"/>
+        <Ref id="2"/>
       </to>
       <push/>
     </transition>
     <transition>
       <from>
-        <ObjectRef id="0"/>
+        <Ref id="1"/>
       </from>
       <input>
-        <ObjectRef id="18"/>
+        <Ref id="19"/>
       </input>
       <pop>
-        <Integer>1</Integer>
+        <Integer ref="72">1</Integer>
       </pop>
       <to>
-        <ObjectRef id="1"/>
+        <Ref id="2"/>
       </to>
       <push/>
     </transition>
     <transition>
       <from>
-        <ObjectRef id="0"/>
+        <Ref id="1"/>
       </from>
       <input>
-        <ObjectRef id="19"/>
+        <Ref id="22"/>
       </input>
       <pop>
-        <Integer>0</Integer>
+        <Integer ref="73">0</Integer>
       </pop>
       <to>
-        <ObjectRef id="0"/>
+        <Ref id="1"/>
       </to>
       <push>
-        <Integer>1</Integer>
+        <Integer ref="74">1</Integer>
       </push>
     </transition>
     <transition>
       <from>
-        <ObjectRef id="0"/>
+        <Ref id="1"/>
       </from>
       <input>
-        <ObjectRef id="19"/>
+        <Ref id="22"/>
       </input>
       <pop>
-        <ObjectRef id="22"/>
+        <Ref id="29"/>
       </pop>
       <to>
-        <ObjectRef id="0"/>
+        <Ref id="1"/>
       </to>
       <push>
-        <ObjectRef id="22"/>
+        <Ref id="29"/>
       </push>
     </transition>
     <transition>
       <from>
-        <ObjectRef id="0"/>
+        <Ref id="1"/>
       </from>
       <input>
-        <ObjectRef id="20"/>
+        <Ref id="25"/>
       </input>
       <pop>
-        <ObjectRef id="21"/>
+        <Ref id="28"/>
       </pop>
       <to>
-        <ObjectRef id="2"/>
+        <Ref id="3"/>
       </to>
       <push>
-        <Integer>2</Integer>
-        <Integer>3</Integer>
+        <Integer ref="75">2</Integer>
+        <Integer ref="76">3</Integer>
       </push>
     </transition>
     <transition>
       <from>
-        <ObjectRef id="0"/>
+        <Ref id="1"/>
       </from>
       <input>
-        <ObjectRef id="20"/>
+        <Ref id="25"/>
       </input>
       <pop>
-        <ObjectRef id="22"/>
+        <Ref id="29"/>
       </pop>
       <to>
-        <ObjectRef id="2"/>
+        <Ref id="3"/>
       </to>
       <push>
-        <Integer>2</Integer>
-        <Integer>3</Integer>
+        <Integer ref="77">2</Integer>
+        <Integer ref="78">3</Integer>
       </push>
     </transition>
     <transition>
       <from>
-        <ObjectRef id="2"/>
+        <Ref id="3"/>
       </from>
       <input>
-        <ObjectRef id="18"/>
+        <Ref id="19"/>
       </input>
       <pop>
-        <Integer>2</Integer>
+        <Integer ref="79">2</Integer>
       </pop>
       <to>
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