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[modules/shaper.git] / src / Model / Model_Document.cpp
index a4c9729ae4594613d8a745d1c6e0b14a42efc013..2487b7c30f1b6d0b068a65299380202a0a5fa73b 100644 (file)
@@ -5,11 +5,13 @@
 #include <Model_Document.h>
 #include <Model_Data.h>
 #include <Model_Application.h>
-#include <Model_PluginManager.h>
+#include <Model_Session.h>
 #include <Model_Events.h>
 #include <Model_ResultPart.h>
 #include <Model_ResultConstruction.h>
 #include <Model_ResultBody.h>
+#include <Model_ResultGroup.h>
+#include <ModelAPI_Validator.h>
 #include <Events_Loop.h>
 #include <Events_Error.h>
 
 # define _separator_ '/'
 #endif
 
-static const int UNDO_LIMIT = 10; // number of possible undo operations
+static const int UNDO_LIMIT = 10;  // number of possible undo operations
 
-static const int TAG_GENERAL = 1; // general properties tag
-static const int TAG_OBJECTS = 2; // tag of the objects sub-tree (features, results)
-static const int TAG_HISTORY = 3; // tag of the history sub-tree (python dump)
+static const int TAG_GENERAL = 1;  // general properties tag
+static const int TAG_OBJECTS = 2;  // tag of the objects sub-tree (features, results)
+static const int TAG_HISTORY = 3;  // tag of the history sub-tree (python dump)
 
 // feature sub-labels
-static const int TAG_FEATURE_ARGUMENTS = 1; ///< where the arguments are located
-static const int TAG_FEATURE_RESULTS = 2; ///< where the results are located
+static const int TAG_FEATURE_ARGUMENTS = 1;  ///< where the arguments are located
+static const int TAG_FEATURE_RESULTS = 2;  ///< where the results are located
 
-
-Model_Document::Model_Document(const std::string theID)
-    : myID(theID), myDoc(new TDocStd_Document("BinOcaf")) // binary OCAF format
+Model_Document::Model_Document(const std::string theID, const std::string theKind)
+    : myID(theID), myKind(theKind),
+      myDoc(new TDocStd_Document("BinOcaf"))  // binary OCAF format
 {
-  myDoc->SetUndoLimit(UNDO_LIMIT);
+  myDoc->SetUndoLimit(UNDO_LIMIT);  
   myTransactionsAfterSave = 0;
   myNestedNum = -1;
-  //myDoc->SetNestedTransactionMode();
+  myExecuteFeatures = true;
   // to have something in the document and avoid empty doc open/save problem
   // in transaction for nesting correct working
   myDoc->NewCommand();
@@ -62,89 +64,103 @@ Model_Document::Model_Document(const std::string theID)
 /// Returns the file name of this document by the nameof directory and identifuer of a document
 static TCollection_ExtendedString DocFileName(const char* theFileName, const std::string& theID)
 {
-  TCollection_ExtendedString aPath ((const Standard_CString)theFileName);
+  TCollection_ExtendedString aPath((const Standard_CString) theFileName);
+  // remove end-separators
+  while(aPath.Length() && (aPath.Value(aPath.Length()) == '\\' || aPath.Value(aPath.Length()) == '/'))
+    aPath.Remove(aPath.Length());
   aPath += _separator_;
   aPath += theID.c_str();
-  aPath += ".cbf"; // standard binary file extension
+  aPath += ".cbf";  // standard binary file extension
   return aPath;
 }
 
 bool Model_Document::load(const char* theFileName)
 {
   Handle(Model_Application) anApp = Model_Application::getApplication();
-  if (this == Model_PluginManager::get()->rootDocument().get()) {
+  if (this == Model_Session::get()->moduleDocument().get()) {
     anApp->setLoadPath(theFileName);
   }
-  TCollection_ExtendedString aPath (DocFileName(theFileName, myID));
+  TCollection_ExtendedString aPath(DocFileName(theFileName, myID));
   PCDM_ReaderStatus aStatus = (PCDM_ReaderStatus) -1;
-  try
-  {
+  try {
     aStatus = anApp->Open(aPath, myDoc);
-  }
-  catch (Standard_Failure)
-  {
+  } catch (Standard_Failure) {
     Handle(Standard_Failure) aFail = Standard_Failure::Caught();
-    Events_Error::send(std::string("Exception in opening of document: ") + aFail->GetMessageString());
+    Events_Error::send(
+        std::string("Exception in opening of document: ") + aFail->GetMessageString());
     return false;
   }
   bool isError = aStatus != PCDM_RS_OK;
-  if (isError)
-  {
-    switch (aStatus)
-    {
-    case PCDM_RS_UnknownDocument: 
-      Events_Error::send(std::string("Can not open document: PCDM_RS_UnknownDocument")); break;
-    case PCDM_RS_AlreadyRetrieved: 
-      Events_Error::send(std::string("Can not open document: PCDM_RS_AlreadyRetrieved")); break;
-    case PCDM_RS_AlreadyRetrievedAndModified:
-      Events_Error::send(
-        std::string("Can not open document: PCDM_RS_AlreadyRetrievedAndModified"));
-      break;
-    case PCDM_RS_NoDriver:
-      Events_Error::send(std::string("Can not open document: PCDM_RS_NoDriver")); break;
-    case PCDM_RS_UnknownFileDriver:
-      Events_Error::send(std::string("Can not open document: PCDM_RS_UnknownFileDriver")); break;
-    case PCDM_RS_OpenError:
-      Events_Error::send(std::string("Can not open document: PCDM_RS_OpenError")); break;
-    case PCDM_RS_NoVersion:
-      Events_Error::send(std::string("Can not open document: PCDM_RS_NoVersion")); break;
-    case PCDM_RS_NoModel:
-      Events_Error::send(std::string("Can not open document: PCDM_RS_NoModel")); break;
-    case PCDM_RS_NoDocument:
-      Events_Error::send(std::string("Can not open document: PCDM_RS_NoDocument")); break;
-    case PCDM_RS_FormatFailure:
-      Events_Error::send(std::string("Can not open document: PCDM_RS_FormatFailure")); break;
-    case PCDM_RS_TypeNotFoundInSchema:
-      Events_Error::send(std::string("Can not open document: PCDM_RS_TypeNotFoundInSchema")); 
-      break;
-    case PCDM_RS_UnrecognizedFileFormat:
-      Events_Error::send(std::string("Can not open document: PCDM_RS_UnrecognizedFileFormat")); 
-      break;
-    case PCDM_RS_MakeFailure:
-      Events_Error::send(std::string("Can not open document: PCDM_RS_MakeFailure")); break;
-    case PCDM_RS_PermissionDenied:
-      Events_Error::send(std::string("Can not open document: PCDM_RS_PermissionDenied")); break;
-    case PCDM_RS_DriverFailure:
-      Events_Error::send(std::string("Can not open document: PCDM_RS_DriverFailure")); break;
-    default:
-      Events_Error::send(std::string("Can not open document: unknown error")); break;
+  if (isError) {
+    switch (aStatus) {
+      case PCDM_RS_UnknownDocument:
+        Events_Error::send(std::string("Can not open document: unknown format"));
+        break;
+      case PCDM_RS_AlreadyRetrieved:
+        Events_Error::send(std::string("Can not open document: already opened"));
+        break;
+      case PCDM_RS_AlreadyRetrievedAndModified:
+        Events_Error::send(
+            std::string("Can not open document: already opened and modified"));
+        break;
+      case PCDM_RS_NoDriver:
+        Events_Error::send(std::string("Can not open document: driver library is not found"));
+        break;
+      case PCDM_RS_UnknownFileDriver:
+        Events_Error::send(std::string("Can not open document: unknown driver for opening"));
+        break;
+      case PCDM_RS_OpenError:
+        Events_Error::send(std::string("Can not open document: file open error"));
+        break;
+      case PCDM_RS_NoVersion:
+        Events_Error::send(std::string("Can not open document: invalid version"));
+        break;
+      case PCDM_RS_NoModel:
+        Events_Error::send(std::string("Can not open document: no data model"));
+        break;
+      case PCDM_RS_NoDocument:
+        Events_Error::send(std::string("Can not open document: no document inside"));
+        break;
+      case PCDM_RS_FormatFailure:
+        Events_Error::send(std::string("Can not open document: format failure"));
+        break;
+      case PCDM_RS_TypeNotFoundInSchema:
+        Events_Error::send(std::string("Can not open document: invalid object"));
+        break;
+      case PCDM_RS_UnrecognizedFileFormat:
+        Events_Error::send(std::string("Can not open document: unrecognized file format"));
+        break;
+      case PCDM_RS_MakeFailure:
+        Events_Error::send(std::string("Can not open document: make failure"));
+        break;
+      case PCDM_RS_PermissionDenied:
+        Events_Error::send(std::string("Can not open document: permission denied"));
+        break;
+      case PCDM_RS_DriverFailure:
+        Events_Error::send(std::string("Can not open document: driver failure"));
+        break;
+      default:
+        Events_Error::send(std::string("Can not open document: unknown error"));
+        break;
     }
   }
   if (!isError) {
     myDoc->SetUndoLimit(UNDO_LIMIT);
-    synchronizeFeatures();
+    // to avoid the problem that feature is created in the current, not this, document
+    Model_Session::get()->setActiveDocument(anApp->getDocument(myID));
+    synchronizeFeatures(false, true);
   }
   return !isError;
 }
 
-bool Model_Document::save(const char* theFileName)
+bool Model_Document::save(const char* theFileName, std::list<std::string>& theResults)
 {
   // create a directory in the root document if it is not yet exist
-  if (this == Model_PluginManager::get()->rootDocument().get()) {
+  if (this == Model_Session::get()->moduleDocument().get()) {
 #ifdef WIN32
     CreateDirectory(theFileName, NULL);
 #else
-    mkdir(theFileName, 0x1ff); 
+    mkdir(theFileName, 0x1ff);
 #endif
   }
   // filename in the dir is id of document inside of the given directory
@@ -152,80 +168,80 @@ bool Model_Document::save(const char* theFileName)
   PCDM_StoreStatus aStatus;
   try {
     aStatus = Model_Application::getApplication()->SaveAs(myDoc, aPath);
-  }
-  catch (Standard_Failure) {
+  } catch (Standard_Failure) {
     Handle(Standard_Failure) aFail = Standard_Failure::Caught();
-    Events_Error::send(std::string("Exception in saving of document: ") + aFail->GetMessageString());
+    Events_Error::send(
+        std::string("Exception in saving of document: ") + aFail->GetMessageString());
     return false;
   }
   bool isDone = aStatus == PCDM_SS_OK || aStatus == PCDM_SS_No_Obj;
-  if (!isDone)
-  {
-    switch (aStatus)
-    {
-    case PCDM_SS_DriverFailure:
-      Events_Error::send(std::string("Can not save document: PCDM_SS_DriverFailure"));
-      break;
-    case PCDM_SS_WriteFailure:
-      Events_Error::send(std::string("Can not save document: PCDM_SS_WriteFailure"));
-      break;
-    case PCDM_SS_Failure:
-    default:
-      Events_Error::send(std::string("Can not save document: PCDM_SS_Failure"));
-      break;
+  if (!isDone) {
+    switch (aStatus) {
+      case PCDM_SS_DriverFailure:
+        Events_Error::send(std::string("Can not save document: save driver-library failure"));
+        break;
+      case PCDM_SS_WriteFailure:
+        Events_Error::send(std::string("Can not save document: file writing failure"));
+        break;
+      case PCDM_SS_Failure:
+      default:
+        Events_Error::send(std::string("Can not save document"));
+        break;
     }
   }
   myTransactionsAfterSave = 0;
-  if (isDone) { // save also sub-documents if any
+  if (isDone) {  // save also sub-documents if any
+    theResults.push_back(TCollection_AsciiString(aPath).ToCString());
     std::set<std::string>::iterator aSubIter = mySubs.begin();
-    for(; aSubIter != mySubs.end() && isDone; aSubIter++)
-      isDone = subDocument(*aSubIter)->save(theFileName);
+    for (; aSubIter != mySubs.end() && isDone; aSubIter++) {
+      isDone = subDoc(*aSubIter)->save(theFileName, theResults);
+    }
   }
   return isDone;
 }
 
 void Model_Document::close()
 {
-  boost::shared_ptr<ModelAPI_PluginManager> aPM = Model_PluginManager::get();
-  if (this != aPM->rootDocument().get() && 
-      this == aPM->currentDocument().get()) {
-    aPM->setCurrentDocument(aPM->rootDocument());
+  boost::shared_ptr<ModelAPI_Session> aPM = Model_Session::get();
+  if (this != aPM->moduleDocument().get() && this == aPM->activeDocument().get()) {
+    aPM->setActiveDocument(aPM->moduleDocument());
   }
   // close all subs
   std::set<std::string>::iterator aSubIter = mySubs.begin();
-  for(; aSubIter != mySubs.end(); aSubIter++)
-    subDocument(*aSubIter)->close();
+  for (; aSubIter != mySubs.end(); aSubIter++)
+    subDoc(*aSubIter)->close();
   mySubs.clear();
-  // close this
-  /* do not close because it can be undoed
-  if (myDoc->CanClose() == CDM_CCS_OK)
-    myDoc->Close();
-  Model_Application::getApplication()->deleteDocument(myID);
-  */
+  // close this only if it is module document, otherwise it can be undoed
+  if (this == aPM->moduleDocument().get()) {
+    if (myDoc->CanClose() == CDM_CCS_OK)
+      myDoc->Close();
+    Model_Application::getApplication()->deleteDocument(myID);
+  }
 }
 
 void Model_Document::startOperation()
 {
-  if (myDoc->HasOpenCommand()) { // start of nested command
+  if (myDoc->HasOpenCommand()) {  // start of nested command
     if (myNestedNum == -1) {
       myNestedNum = 0;
       myDoc->InitDeltaCompaction();
     }
-    myIsEmptyTr[myTransactionsAfterSave] = false;
+    myIsEmptyTr[myTransactionsAfterSave] = !myDoc->CommitCommand();
     myTransactionsAfterSave++;
-    myDoc->NewCommand();
-  } else { // start the simple command
+    myDoc->OpenCommand();
+  } else {  // start the simple command
     myDoc->NewCommand();
   }
   // new command for all subs
   std::set<std::string>::iterator aSubIter = mySubs.begin();
-  for(; aSubIter != mySubs.end(); aSubIter++)
-    subDocument(*aSubIter)->startOperation();
+  for (; aSubIter != mySubs.end(); aSubIter++)
+    subDoc(*aSubIter)->startOperation();
 }
 
-void Model_Document::compactNested() {
+bool Model_Document::compactNested()
+{
   bool allWasEmpty = true;
-  while(myNestedNum != -1) {
+  while (myNestedNum != -1) {
     myTransactionsAfterSave--;
     if (!myIsEmptyTr[myTransactionsAfterSave]) {
       allWasEmpty = false;
@@ -236,24 +252,32 @@ void Model_Document::compactNested() {
   myIsEmptyTr[myTransactionsAfterSave] = allWasEmpty;
   myTransactionsAfterSave++;
   myDoc->PerformDeltaCompaction();
+  return !allWasEmpty;
 }
 
 void Model_Document::finishOperation()
 {
+  // finish for all subs first: to avoid nested finishing and "isOperation" calls problems inside
+  std::set<std::string>::iterator aSubIter = mySubs.begin();
+  for (; aSubIter != mySubs.end(); aSubIter++)
+    subDoc(*aSubIter)->finishOperation();
+
   // just to be sure that everybody knows that changes were performed
-  
   if (!myDoc->HasOpenCommand() && myNestedNum != -1)
-    boost::static_pointer_cast<Model_PluginManager>(Model_PluginManager::get())->
-      setCheckTransactions(false); // for nested transaction commit
-  Events_Loop::loop()->flush(Events_Loop::eventByName(EVENT_OBJECT_CREATED));
-  Events_Loop::loop()->flush(Events_Loop::eventByName(EVENT_OBJECT_UPDATED));
-  Events_Loop::loop()->flush(Events_Loop::eventByName(EVENT_OBJECT_TO_REDISPLAY));
-  Events_Loop::loop()->flush(Events_Loop::eventByName(EVENT_OBJECT_DELETED));
+    boost::static_pointer_cast<Model_Session>(Model_Session::get())
+        ->setCheckTransactions(false);  // for nested transaction commit
+  synchronizeBackRefs();
+  Events_Loop* aLoop = Events_Loop::loop();
+  aLoop->flush(Events_Loop::eventByName(EVENT_OBJECT_CREATED));
+  aLoop->flush(Events_Loop::eventByName(EVENT_OBJECT_UPDATED));
+  aLoop->flush(Events_Loop::eventByName(EVENT_OBJECT_TO_REDISPLAY));
+  aLoop->flush(Events_Loop::eventByName(EVENT_OBJECT_TOHIDE));
+  aLoop->flush(Events_Loop::eventByName(EVENT_OBJECT_DELETED));
   if (!myDoc->HasOpenCommand() && myNestedNum != -1)
-    boost::static_pointer_cast<Model_PluginManager>(Model_PluginManager::get())->
-      setCheckTransactions(true); // for nested transaction commit
+    boost::static_pointer_cast<Model_Session>(Model_Session::get())
+        ->setCheckTransactions(true);  // for nested transaction commit
 
-  if (myNestedNum != -1) // this nested transaction is owervritten
+  if (myNestedNum != -1)  // this nested transaction is owervritten
     myNestedNum++;
   if (!myDoc->HasOpenCommand()) {
     if (myNestedNum != -1) {
@@ -262,58 +286,55 @@ void Model_Document::finishOperation()
     }
   } else {
     // returns false if delta is empty and no transaction was made
-    myIsEmptyTr[myTransactionsAfterSave] = !myDoc->CommitCommand();// && (myNestedNum == -1);
+    myIsEmptyTr[myTransactionsAfterSave] = !myDoc->CommitCommand();  // && (myNestedNum == -1);
     myTransactionsAfterSave++;
   }
-
-  // finish for all subs
-  std::set<std::string>::iterator aSubIter = mySubs.begin();
-  for(; aSubIter != mySubs.end(); aSubIter++)
-    subDocument(*aSubIter)->finishOperation();
 }
 
 void Model_Document::abortOperation()
 {
-  if (myNestedNum > 0 && !myDoc->HasOpenCommand()) { // abort all what was done in nested
-    // first compact all nested
-    compactNested();
-    // for nested it is undo and clear redos
-    myDoc->Undo();
+  if (myNestedNum > 0 && !myDoc->HasOpenCommand()) {  // abort all what was done in nested
+      // first compact all nested
+    if (compactNested()) {
+      // for nested it is undo and clear redos
+      myDoc->Undo();
+    }
     myDoc->ClearRedos();
     myTransactionsAfterSave--;
     myIsEmptyTr.erase(myTransactionsAfterSave);
   } else {
-    if (myNestedNum == 0) // abort only high-level
+    if (myNestedNum == 0)  // abort only high-level
       myNestedNum = -1;
     myDoc->AbortCommand();
   }
-  synchronizeFeatures(true);
+  synchronizeFeatures(true, false); // references were not changed since transaction start
   // abort for all subs
   std::set<std::string>::iterator aSubIter = mySubs.begin();
-    for(; aSubIter != mySubs.end(); aSubIter++)
-    subDocument(*aSubIter)->abortOperation();
+  for (; aSubIter != mySubs.end(); aSubIter++)
+    subDoc(*aSubIter)->abortOperation();
 }
 
 bool Model_Document::isOperation()
 {
   // operation is opened for all documents: no need to check subs
-  return myDoc->HasOpenCommand() == Standard_True;
+  return myDoc->HasOpenCommand() == Standard_True ;
 }
 
 bool Model_Document::isModified()
 {
   // is modified if at least one operation was commited and not undoed
-  return myTransactionsAfterSave > 0;
+  return myTransactionsAfterSave > 0 || isOperation();
 }
 
 bool Model_Document::canUndo()
 {
-  if (myDoc->GetAvailableUndos() > 0 && myNestedNum != 0 && myTransactionsAfterSave != 0 /* for omitting the first useless transaction */)
+  if (myDoc->GetAvailableUndos() > 0 && myNestedNum != 0
+      && myTransactionsAfterSave != 0 /* for omitting the first useless transaction */)
     return true;
   // check other subs contains operation that can be undoed
   std::set<std::string>::iterator aSubIter = mySubs.begin();
-  for(; aSubIter != mySubs.end(); aSubIter++)
-    if (subDocument(*aSubIter)->canUndo())
+  for (; aSubIter != mySubs.end(); aSubIter++)
+    if (subDoc(*aSubIter)->canUndo())
       return true;
   return false;
 }
@@ -321,14 +342,15 @@ bool Model_Document::canUndo()
 void Model_Document::undo()
 {
   myTransactionsAfterSave--;
-  if (myNestedNum > 0) myNestedNum--;
+  if (myNestedNum > 0)
+    myNestedNum--;
   if (!myIsEmptyTr[myTransactionsAfterSave])
     myDoc->Undo();
-  synchronizeFeatures(true);
+  synchronizeFeatures(true, true);
   // undo for all subs
   std::set<std::string>::iterator aSubIter = mySubs.begin();
-  for(; aSubIter != mySubs.end(); aSubIter++)
-    subDocument(*aSubIter)->undo();
+  for (; aSubIter != mySubs.end(); aSubIter++)
+    subDoc(*aSubIter)->undo();
 }
 
 bool Model_Document::canRedo()
@@ -337,35 +359,37 @@ bool Model_Document::canRedo()
     return true;
   // check other subs contains operation that can be redoed
   std::set<std::string>::iterator aSubIter = mySubs.begin();
-  for(; aSubIter != mySubs.end(); aSubIter++)
-    if (subDocument(*aSubIter)->canRedo())
+  for (; aSubIter != mySubs.end(); aSubIter++)
+    if (subDoc(*aSubIter)->canRedo())
       return true;
   return false;
 }
 
 void Model_Document::redo()
 {
-  if (myNestedNum != -1) myNestedNum++;
+  if (myNestedNum != -1)
+    myNestedNum++;
   if (!myIsEmptyTr[myTransactionsAfterSave])
     myDoc->Redo();
   myTransactionsAfterSave++;
-  synchronizeFeatures(true);
+  synchronizeFeatures(true, true);
   // redo for all subs
   std::set<std::string>::iterator aSubIter = mySubs.begin();
-  for(; aSubIter != mySubs.end(); aSubIter++)
-    subDocument(*aSubIter)->redo();
+  for (; aSubIter != mySubs.end(); aSubIter++)
+    subDoc(*aSubIter)->redo();
 }
 
 /// Appenad to the array of references a new referenced label
-static void AddToRefArray(TDF_Label& theArrayLab, TDF_Label& theReferenced) {
+static void AddToRefArray(TDF_Label& theArrayLab, TDF_Label& theReferenced)
+{
   Handle(TDataStd_ReferenceArray) aRefs;
   if (!theArrayLab.FindAttribute(TDataStd_ReferenceArray::GetID(), aRefs)) {
     aRefs = TDataStd_ReferenceArray::Set(theArrayLab, 0, 0);
     aRefs->SetValue(0, theReferenced);
-  } else { // extend array by one more element
-    Handle(TDataStd_HLabelArray1) aNewArray = 
-      new TDataStd_HLabelArray1(aRefs->Lower(), aRefs->Upper() + 1);
-    for(int a = aRefs->Lower(); a <= aRefs->Upper(); a++) {
+  } else {  // extend array by one more element
+    Handle(TDataStd_HLabelArray1) aNewArray = new TDataStd_HLabelArray1(aRefs->Lower(),
+                                                                        aRefs->Upper() + 1);
+    for (int a = aRefs->Lower(); a <= aRefs->Upper(); a++) {
       aNewArray->SetValue(a, aRefs->Value(a));
     }
     aNewArray->SetValue(aRefs->Upper() + 1, theReferenced);
@@ -377,12 +401,14 @@ FeaturePtr Model_Document::addFeature(std::string theID)
 {
   TDF_Label anEmptyLab;
   FeaturePtr anEmptyFeature;
-  FeaturePtr aFeature = ModelAPI_PluginManager::get()->createFeature(theID);
-  boost::shared_ptr<Model_Document> aDocToAdd = 
-    boost::dynamic_pointer_cast<Model_Document>(aFeature->documentToAdd());
+  FeaturePtr aFeature = ModelAPI_Session::get()->createFeature(theID);
+  if (!aFeature)
+    return aFeature;
+  boost::shared_ptr<Model_Document> aDocToAdd = boost::dynamic_pointer_cast<Model_Document>(
+      aFeature->documentToAdd());
   if (aFeature) {
     TDF_Label aFeatureLab;
-    if (!aFeature->isAction()) {// do not add action to the data model
+    if (!aFeature->isAction()) {  // do not add action to the data model
       TDF_Label aFeaturesLab = aDocToAdd->featuresLabel();
       aFeatureLab = aFeaturesLab.NewChild();
       aDocToAdd->initData(aFeature, aFeatureLab, TAG_FEATURE_ARGUMENTS);
@@ -394,10 +420,13 @@ FeaturePtr Model_Document::addFeature(std::string theID)
         AddToRefArray(aFeaturesLab, aFeatureLab);
       }
     }
-    if (!aFeature->isAction()) {// do not add action to the data model
+    if (!aFeature->isAction()) {  // do not add action to the data model
       // event: feature is added
       static Events_ID anEvent = Events_Loop::eventByName(EVENT_OBJECT_CREATED);
       ModelAPI_EventCreator::get()->sendUpdated(aFeature, anEvent);
+    } else { // feature must be executed
+       // no creation event => updater not working, problem with remove part
+      aFeature->execute();
     }
   }
   return aFeature;
@@ -406,21 +435,22 @@ FeaturePtr Model_Document::addFeature(std::string theID)
 /// Appenad to the array of references a new referenced label.
 /// If theIndex is not -1, removes element at thisindex, not theReferenced.
 /// \returns the index of removed element
-static int RemoveFromRefArray(
-  TDF_Label theArrayLab, TDF_Label theReferenced, const int theIndex = -1) {
-  int aResult = -1; // no returned
+static int RemoveFromRefArray(TDF_Label theArrayLab, TDF_Label theReferenced, const int theIndex =
+                                  -1)
+{
+  int aResult = -1;  // no returned
   Handle(TDataStd_ReferenceArray) aRefs;
   if (theArrayLab.FindAttribute(TDataStd_ReferenceArray::GetID(), aRefs)) {
-    if (aRefs->Length() == 1) { // just erase an array
+    if (aRefs->Length() == 1) {  // just erase an array
       if ((theIndex == -1 && aRefs->Value(0) == theReferenced) || theIndex == 0) {
         theArrayLab.ForgetAttribute(TDataStd_ReferenceArray::GetID());
       }
       aResult = 0;
-    } else { // reduce the array
-      Handle(TDataStd_HLabelArray1) aNewArray = 
-        new TDataStd_HLabelArray1(aRefs->Lower(), aRefs->Upper() - 1);
+    } else {  // reduce the array
+      Handle(TDataStd_HLabelArray1) aNewArray = new TDataStd_HLabelArray1(aRefs->Lower(),
+                                                                          aRefs->Upper() - 1);
       int aCount = aRefs->Lower();
-      for(int a = aCount; a <= aRefs->Upper(); a++, aCount++) {
+      for (int a = aCount; a <= aRefs->Upper(); a++, aCount++) {
         if ((theIndex == -1 && aRefs->Value(a) == theReferenced) || theIndex == a) {
           aCount--;
           aResult = a;
@@ -434,38 +464,45 @@ static int RemoveFromRefArray(
   return aResult;
 }
 
-void Model_Document::removeFeature(FeaturePtr theFeature)
+void Model_Document::removeFeature(FeaturePtr theFeature, const bool theCheck)
 {
+  if (theCheck) {
+    // check the feature: it must have no depended objects on it
+    std::list<ResultPtr>::const_iterator aResIter = theFeature->results().cbegin();
+    for(; aResIter != theFeature->results().cend(); aResIter++) {
+      boost::shared_ptr<Model_Data> aData = 
+        boost::dynamic_pointer_cast<Model_Data>((*aResIter)->data());
+      if (aData && !aData->refsToMe().empty()) {
+        Events_Error::send(
+          "Feature '" + theFeature->data()->name() + "' is used and can not be deleted");
+        return;
+      }
+    }
+  }
+
   boost::shared_ptr<Model_Data> aData = boost::static_pointer_cast<Model_Data>(theFeature->data());
   TDF_Label aFeatureLabel = aData->label().Father();
-  if (myObjs.IsBound(aFeatureLabel)) 
+  if (myObjs.IsBound(aFeatureLabel))
     myObjs.UnBind(aFeatureLabel);
-  else return; // not found feature => do not remove
-
+  else
+    return;  // not found feature => do not remove
+  // erase fields
+  theFeature->erase();
   // erase all attributes under the label of feature
   aFeatureLabel.ForgetAllAttributes();
   // remove it from the references array
-  RemoveFromRefArray(featuresLabel(), aFeatureLabel);
-
+  if (theFeature->isInHistory()) {
+    RemoveFromRefArray(featuresLabel(), aFeatureLabel);
+  }
   // event: feature is deleted
   ModelAPI_EventCreator::get()->sendDeleted(theFeature->document(), ModelAPI_Feature::group());
-  // results of this feature must be redisplayed
-  static Events_ID EVENT_DISP = Events_Loop::loop()->eventByName(EVENT_OBJECT_TO_REDISPLAY);
-  const std::list<boost::shared_ptr<ModelAPI_Result> >& aResults = theFeature->results();
-  std::list<boost::shared_ptr<ModelAPI_Result> >::const_iterator aRIter = aResults.begin();
-  for(; aRIter != aResults.cend(); aRIter++) {
-    boost::shared_ptr<ModelAPI_Result> aRes = *aRIter;
-    aRes->setData(boost::shared_ptr<ModelAPI_Data>()); // deleted flag
-    ModelAPI_EventCreator::get()->sendUpdated(aRes, EVENT_DISP);
-    ModelAPI_EventCreator::get()->sendDeleted(theFeature->document(), aRes->groupName());
-  }
 }
 
 FeaturePtr Model_Document::feature(TDF_Label& theLabel)
 {
   if (myObjs.IsBound(theLabel))
     return myObjs.Find(theLabel);
-  return FeaturePtr(); // not found
+  return FeaturePtr();  // not found
 }
 
 ObjectPtr Model_Document::object(TDF_Label theLabel)
@@ -474,19 +511,19 @@ ObjectPtr Model_Document::object(TDF_Label theLabel)
   FeaturePtr aFeature = feature(theLabel);
   if (aFeature)
     return feature(theLabel);
-  TDF_Label aFeatureLabel = theLabel.Father().Father(); // let's suppose it is result
+  TDF_Label aFeatureLabel = theLabel.Father().Father();  // let's suppose it is result
   aFeature = feature(aFeatureLabel);
   if (aFeature) {
     const std::list<boost::shared_ptr<ModelAPI_Result> >& aResults = aFeature->results();
     std::list<boost::shared_ptr<ModelAPI_Result> >::const_iterator aRIter = aResults.cbegin();
-    for(; aRIter != aResults.cend(); aRIter++) {
-      boost::shared_ptr<Model_Data> aResData = 
-        boost::dynamic_pointer_cast<Model_Data>((*aRIter)->data());
+    for (; aRIter != aResults.cend(); aRIter++) {
+      boost::shared_ptr<Model_Data> aResData = boost::dynamic_pointer_cast<Model_Data>(
+          (*aRIter)->data());
       if (aResData->label().Father().IsEqual(theLabel))
         return *aRIter;
     }
   }
-  return FeaturePtr(); // not found
+  return FeaturePtr();  // not found
 }
 
 boost::shared_ptr<ModelAPI_Document> Model_Document::subDocument(std::string theDocID)
@@ -497,14 +534,23 @@ boost::shared_ptr<ModelAPI_Document> Model_Document::subDocument(std::string the
   return Model_Application::getApplication()->getDocument(theDocID);
 }
 
-ObjectPtr Model_Document::object(const std::string& theGroupID, 
-  const int theIndex, const bool theHidden)
+boost::shared_ptr<Model_Document> Model_Document::subDoc(std::string theDocID)
+{
+  // just store sub-document identifier here to manage it later
+  if (mySubs.find(theDocID) == mySubs.end())
+    mySubs.insert(theDocID);
+  return boost::dynamic_pointer_cast<Model_Document>(
+    Model_Application::getApplication()->getDocument(theDocID));
+}
+
+ObjectPtr Model_Document::object(const std::string& theGroupID, const int theIndex,
+                                 const bool theHidden)
 {
   if (theGroupID == ModelAPI_Feature::group()) {
     if (theHidden) {
       int anIndex = 0;
       TDF_ChildIDIterator aLabIter(featuresLabel(), TDataStd_Comment::GetID());
-      for(; aLabIter.More(); aLabIter.Next()) {
+      for (; aLabIter.More(); aLabIter.Next()) {
         if (theIndex == anIndex) {
           TDF_Label aFLabel = aLabIter.Value()->Label();
           return feature(aFLabel);
@@ -524,13 +570,18 @@ ObjectPtr Model_Document::object(const std::string& theGroupID,
     // comment must be in any feature: it is kind
     int anIndex = 0;
     TDF_ChildIDIterator aLabIter(featuresLabel(), TDataStd_Comment::GetID());
-    for(; aLabIter.More(); aLabIter.Next()) {
+    for (; aLabIter.More(); aLabIter.Next()) {
       TDF_Label aFLabel = aLabIter.Value()->Label();
       FeaturePtr aFeature = feature(aFLabel);
       const std::list<boost::shared_ptr<ModelAPI_Result> >& aResults = aFeature->results();
       std::list<boost::shared_ptr<ModelAPI_Result> >::const_iterator aRIter = aResults.begin();
-      for(; aRIter != aResults.cend(); aRIter++) {
-        if ((theHidden || (*aRIter)->isInHistory()) && (*aRIter)->groupName() == theGroupID) {
+      for (; aRIter != aResults.cend(); aRIter++) {
+        if ((*aRIter)->groupName() != theGroupID) continue;
+        bool isIn = theHidden && (*aRIter)->isInHistory();
+        if (!isIn && (*aRIter)->isInHistory()) { // check that there is nobody references this result
+          isIn = !(*aRIter)->isConcealed();
+        }
+        if (isIn) {
           if (anIndex == theIndex)
             return *aRIter;
           anIndex++;
@@ -542,7 +593,7 @@ ObjectPtr Model_Document::object(const std::string& theGroupID,
   return ObjectPtr();
 }
 
-int Model_Document::size(const std::string& theGroupID, const bool theHidden) 
+int Model_Document::size(const std::string& theGroupID, const bool theHidden)
 {
   int aResult = 0;
   if (theGroupID == ModelAPI_Feature::group()) {
@@ -556,15 +607,19 @@ int Model_Document::size(const std::string& theGroupID, const bool theHidden)
   } else {
     // comment must be in any feature: it is kind
     TDF_ChildIDIterator aLabIter(featuresLabel(), TDataStd_Comment::GetID());
-    for(; aLabIter.More(); aLabIter.Next()) {
+    for (; aLabIter.More(); aLabIter.Next()) {
       TDF_Label aFLabel = aLabIter.Value()->Label();
       FeaturePtr aFeature = feature(aFLabel);
       const std::list<boost::shared_ptr<ModelAPI_Result> >& aResults = aFeature->results();
       std::list<boost::shared_ptr<ModelAPI_Result> >::const_iterator aRIter = aResults.begin();
-      for(; aRIter != aResults.cend(); aRIter++) {
-        if ((theHidden || (*aRIter)->isInHistory()) && (*aRIter)->groupName() == theGroupID) {
-          aResult++;
+      for (; aRIter != aResults.cend(); aRIter++) {
+        if ((*aRIter)->groupName() != theGroupID) continue;
+        bool isIn = theHidden;
+        if (!isIn && (*aRIter)->isInHistory()) { // check that there is nobody references this result
+          isIn = !(*aRIter)->isConcealed();
         }
+        if (isIn)
+          aResult++;
       }
     }
   }
@@ -579,45 +634,48 @@ TDF_Label Model_Document::featuresLabel()
 
 void Model_Document::setUniqueName(FeaturePtr theFeature)
 {
-  if (!theFeature->data()->name().empty()) return; // not needed, name is already defined
-  std::string aName; // result
+  if (!theFeature->data()->name().empty())
+    return;  // not needed, name is already defined
+  std::string aName;  // result
   // first count all objects of such kind to start with index = count + 1
   int aNumObjects = 0;
   NCollection_DataMap<TDF_Label, FeaturePtr>::Iterator aFIter(myObjs);
-  for(; aFIter.More(); aFIter.Next()) {
+  for (; aFIter.More(); aFIter.Next()) {
     if (aFIter.Value()->getKind() == theFeature->getKind())
       aNumObjects++;
   }
   // generate candidate name
   std::stringstream aNameStream;
-  aNameStream<<theFeature->getKind()<<"_"<<aNumObjects + 1;
+  aNameStream << theFeature->getKind() << "_" << aNumObjects + 1;
   aName = aNameStream.str();
   // check this is unique, if not, increase index by 1
-  for(aFIter.Initialize(myObjs); aFIter.More(); ) {
+  for (aFIter.Initialize(myObjs); aFIter.More();) {
     FeaturePtr aFeature = aFIter.Value();
-    bool isSameName = aFeature->isInHistory() && aFeature->data()->name() == aName;
-    if (!isSameName) { // check also results to avoid same results names (actual for Parts)
+    bool isSameName = aFeature->data()->name() == aName;
+    if (!isSameName) {  // check also results to avoid same results names (actual for Parts)
       const std::list<boost::shared_ptr<ModelAPI_Result> >& aResults = aFeature->results();
       std::list<boost::shared_ptr<ModelAPI_Result> >::const_iterator aRIter = aResults.begin();
-      for(; aRIter != aResults.cend(); aRIter++) {
-        isSameName = (*aRIter)->isInHistory() && (*aRIter)->data()->name() == aName;
+      for (; aRIter != aResults.cend(); aRIter++) {
+        isSameName = (*aRIter)->data()->name() == aName;
       }
     }
     if (isSameName) {
       aNumObjects++;
       std::stringstream aNameStream;
-      aNameStream<<theFeature->getKind()<<"_"<<aNumObjects + 1;
+      aNameStream << theFeature->getKind() << "_" << aNumObjects + 1;
       aName = aNameStream.str();
       // reinitialize iterator to make sure a new name is unique
       aFIter.Initialize(myObjs);
-    } else aFIter.Next();
+    } else
+      aFIter.Next();
   }
   theFeature->data()->setName(aName);
 }
 
-void Model_Document::initData(ObjectPtr theObj, TDF_Label theLab, const int theTag) {
-  boost::shared_ptr<ModelAPI_Document> aThis = 
-    Model_Application::getApplication()->getDocument(myID);
+void Model_Document::initData(ObjectPtr theObj, TDF_Label theLab, const int theTag)
+{
+  boost::shared_ptr<ModelAPI_Document> aThis = Model_Application::getApplication()->getDocument(
+      myID);
   boost::shared_ptr<Model_Data> aData(new Model_Data);
   aData->setLabel(theLab.FindChild(theTag));
   aData->setObject(theObj);
@@ -625,105 +683,191 @@ void Model_Document::initData(ObjectPtr theObj, TDF_Label theLab, const int theT
   theObj->setData(aData);
   FeaturePtr aFeature = boost::dynamic_pointer_cast<ModelAPI_Feature>(theObj);
   if (aFeature) {
-    setUniqueName(aFeature); // must be before "initAttributes" because duplicate part uses name
+    setUniqueName(aFeature);  // must be before "initAttributes" because duplicate part uses name
     aFeature->initAttributes();
   }
 }
 
-void Model_Document::synchronizeFeatures(const bool theMarkUpdated)
+void Model_Document::synchronizeFeatures(const bool theMarkUpdated, const bool theUpdateReferences)
 {
   boost::shared_ptr<ModelAPI_Document> aThis = 
     Model_Application::getApplication()->getDocument(myID);
+  // after all updates, sends a message that groups of features were created or updated
+  boost::static_pointer_cast<Model_Session>(Model_Session::get())
+    ->setCheckTransactions(false);
+  Events_Loop* aLoop = Events_Loop::loop();
+  aLoop->activateFlushes(false);
+
   // update all objects by checking are they of labels or not
   std::set<FeaturePtr> aNewFeatures, aKeptFeatures;
   TDF_ChildIDIterator aLabIter(featuresLabel(), TDataStd_Comment::GetID());
-  for(; aLabIter.More(); aLabIter.Next()) {
+  for (; aLabIter.More(); aLabIter.Next()) {
     TDF_Label aFeatureLabel = aLabIter.Value()->Label();
-    if (!myObjs.IsBound(aFeatureLabel)) { // a new feature is inserted
+    FeaturePtr aFeature;
+    if (!myObjs.IsBound(aFeatureLabel)) {  // a new feature is inserted
       // create a feature
-      FeaturePtr aNewObj = ModelAPI_PluginManager::get()->createFeature(
-        TCollection_AsciiString(Handle(TDataStd_Comment)::DownCast(aLabIter.Value())->Get())
-        .ToCString());
+      aFeature = ModelAPI_Session::get()->createFeature(
+          TCollection_AsciiString(Handle(TDataStd_Comment)::DownCast(aLabIter.Value())->Get())
+              .ToCString());
+      if (!aFeature) {  // somethig is wrong, most probably, the opened document has invalid structure
+        Events_Error::send("Invalid type of object in the document");
+        aLabIter.Value()->Label().ForgetAllAttributes();
+        continue;
+      }
       // this must be before "setData" to redo the sketch line correctly
-      myObjs.Bind(aFeatureLabel, aNewObj);
-      aNewFeatures.insert(aNewObj);
-      initData(aNewObj, aFeatureLabel, TAG_FEATURE_ARGUMENTS);
+      myObjs.Bind(aFeatureLabel, aFeature);
+      aNewFeatures.insert(aFeature);
+      initData(aFeature, aFeatureLabel, TAG_FEATURE_ARGUMENTS);
 
       // event: model is updated
       static Events_ID anEvent = Events_Loop::eventByName(EVENT_OBJECT_CREATED);
-      ModelAPI_EventCreator::get()->sendUpdated(aNewObj, anEvent);
-      // feature for this label is added, so go to the next label
-    } else { // nothing is changed, both iterators are incremented
-      aKeptFeatures.insert(myObjs.Find(aFeatureLabel));
+      ModelAPI_EventCreator::get()->sendUpdated(aFeature, anEvent);
+
+      // update results of the appeared feature
+      updateResults(aFeature);
+    } else {  // nothing is changed, both iterators are incremented
+      aFeature = myObjs.Find(aFeatureLabel);
+      aKeptFeatures.insert(aFeature);
       if (theMarkUpdated) {
         static Events_ID anEvent = Events_Loop::eventByName(EVENT_OBJECT_UPDATED);
-        ModelAPI_EventCreator::get()->sendUpdated(myObjs.Find(aFeatureLabel), anEvent);
+        ModelAPI_EventCreator::get()->sendUpdated(aFeature, anEvent);
       }
+      updateResults(aFeature);
     }
   }
-  // execute new features to restore results: after features creation to make all references valid
-  /*std::set<FeaturePtr>::iterator aNewIter = aNewFeatures.begin();
-  for(; aNewIter != aNewFeatures.end(); aNewIter++) {
-      (*aNewIter)->execute();
-  }*/
   // check all features are checked: if not => it was removed
   NCollection_DataMap<TDF_Label, FeaturePtr>::Iterator aFIter(myObjs);
-  while(aFIter.More()) {
-    if (aKeptFeatures.find(aFIter.Value()) == aKeptFeatures.end() &&
-        aNewFeatures.find(aFIter.Value()) == aNewFeatures.end()) {
+  while (aFIter.More()) {
+    if (aKeptFeatures.find(aFIter.Value()) == aKeptFeatures.end()
+        && aNewFeatures.find(aFIter.Value()) == aNewFeatures.end()) {
       FeaturePtr aFeature = aFIter.Value();
-      TDF_Label aLab = aFIter.Key();
-      aFIter.Next();
-      myObjs.UnBind(aLab);
       // event: model is updated
-      if (aFeature->isInHistory()) {
+      //if (aFeature->isInHistory()) {
         ModelAPI_EventCreator::get()->sendDeleted(aThis, ModelAPI_Feature::group());
-      }
+      //}
       // results of this feature must be redisplayed (hided)
-      static Events_ID EVENT_DISP = Events_Loop::loop()->eventByName(EVENT_OBJECT_TO_REDISPLAY);
+      static Events_ID EVENT_DISP = aLoop->eventByName(EVENT_OBJECT_TO_REDISPLAY);
       const std::list<boost::shared_ptr<ModelAPI_Result> >& aResults = aFeature->results();
       std::list<boost::shared_ptr<ModelAPI_Result> >::const_iterator aRIter = aResults.begin();
-      for(; aRIter != aResults.cend(); aRIter++) {
-        boost::shared_ptr<ModelAPI_Result> aRes = *aRIter;
-        //aRes->setData(boost::shared_ptr<ModelAPI_Data>()); // deleted flag
-        ModelAPI_EventCreator::get()->sendUpdated(aRes, EVENT_DISP);
-        ModelAPI_EventCreator::get()->sendDeleted(aThis, aRes->groupName());
-      }
       // redisplay also removed feature (used for sketch and AISObject)
       ModelAPI_EventCreator::get()->sendUpdated(aFeature, EVENT_DISP);
-    } else aFIter.Next();
+      aFeature->erase();
+      // unbind after the "erase" call: on abort sketch is removes sub-objects that corrupts aFIter
+      TDF_Label aLab = aFIter.Key();
+      aFIter.Next();
+      myObjs.UnBind(aLab);
+    } else
+      aFIter.Next();
   }
 
-  // after all updates, sends a message that groups of features were created or updated
-  boost::static_pointer_cast<Model_PluginManager>(Model_PluginManager::get())->
-    setCheckTransactions(false);
-  Events_Loop::loop()->flush(Events_Loop::eventByName(EVENT_OBJECT_CREATED));
-  if (theMarkUpdated)
-    Events_Loop::loop()->flush(Events_Loop::eventByName(EVENT_OBJECT_UPDATED));
-  Events_Loop::loop()->flush(Events_Loop::eventByName(EVENT_OBJECT_DELETED));
-  Events_Loop::loop()->flush(Events_Loop::eventByName(EVENT_OBJECT_TO_REDISPLAY));
-  boost::static_pointer_cast<Model_PluginManager>(Model_PluginManager::get())->
-    setCheckTransactions(true);
+  if (theUpdateReferences) {
+    synchronizeBackRefs();
+  }
+
+  myExecuteFeatures = false;
+  aLoop->activateFlushes(true);
+
+  aLoop->flush(Events_Loop::eventByName(EVENT_OBJECT_CREATED));
+  aLoop->flush(Events_Loop::eventByName(EVENT_OBJECT_DELETED));
+  if (theMarkUpdated) {
+    aLoop->flush(Events_Loop::eventByName(EVENT_OBJECT_UPDATED));
+  }
+  aLoop->flush(Events_Loop::eventByName(EVENT_OBJECT_TO_REDISPLAY));
+  aLoop->flush(Events_Loop::eventByName(EVENT_OBJECT_TOHIDE));
+  boost::static_pointer_cast<Model_Session>(Model_Session::get())
+    ->setCheckTransactions(true);
+  myExecuteFeatures = true;
+}
+
+void Model_Document::synchronizeBackRefs()
+{
+  boost::shared_ptr<ModelAPI_Document> aThis = 
+    Model_Application::getApplication()->getDocument(myID);
+  // keeps the concealed flags of result to catch the change and create created/deleted events
+  std::list<std::pair<ResultPtr, bool> > aConcealed;
+  // first cycle: erase all data about back-references
+  NCollection_DataMap<TDF_Label, FeaturePtr>::Iterator aFeatures(myObjs);
+  for(; aFeatures.More(); aFeatures.Next()) {
+    FeaturePtr aFeature = aFeatures.Value();
+    boost::shared_ptr<Model_Data> aFData = 
+      boost::dynamic_pointer_cast<Model_Data>(aFeature->data());
+    if (aFData) {
+      aFData->eraseBackReferences();
+    }
+    const std::list<boost::shared_ptr<ModelAPI_Result> >& aResults = aFeature->results();
+    std::list<boost::shared_ptr<ModelAPI_Result> >::const_iterator aRIter = aResults.begin();
+    for (; aRIter != aResults.cend(); aRIter++) {
+      boost::shared_ptr<Model_Data> aResData = 
+        boost::dynamic_pointer_cast<Model_Data>((*aRIter)->data());
+      if (aResData) {
+        aConcealed.push_back(std::pair<ResultPtr, bool>(*aRIter, (*aRIter)->isConcealed()));
+        aResData->eraseBackReferences();
+      }
+    }
+  }
+
+  // second cycle: set new back-references: only features may have reference, iterate only them
+  ModelAPI_ValidatorsFactory* aValidators = ModelAPI_Session::get()->validators();
+  for(aFeatures.Initialize(myObjs); aFeatures.More(); aFeatures.Next()) {
+    FeaturePtr aFeature = aFeatures.Value();
+    boost::shared_ptr<Model_Data> aFData = 
+      boost::dynamic_pointer_cast<Model_Data>(aFeature->data());
+    if (aFData) {
+      std::list<std::pair<std::string, std::list<ObjectPtr> > > aRefs;
+      aFData->referencesToObjects(aRefs);
+      std::list<std::pair<std::string, std::list<ObjectPtr> > >::iterator aRefsIter = aRefs.begin();
+      for(; aRefsIter != aRefs.end(); aRefsIter++) {
+        std::list<ObjectPtr>::iterator aRefTo = aRefsIter->second.begin();
+        for(; aRefTo != aRefsIter->second.end(); aRefTo++) {
+          if (*aRefTo) {
+            boost::shared_ptr<Model_Data> aRefData = 
+              boost::dynamic_pointer_cast<Model_Data>((*aRefTo)->data());
+            aRefData->addBackReference(aFeature, aRefsIter->first); // here the Concealed flag is updated
+          }
+        }
+      }
+    }
+  }
+  std::list<std::pair<ResultPtr, bool> >::iterator aCIter = aConcealed.begin();
+  for(; aCIter != aConcealed.end(); aCIter++) {
+    if (aCIter->first->isConcealed() != aCIter->second) { // somethign is changed => produce event
+      if (aCIter->second) { // was concealed become not => creation event
+        static Events_ID anEvent = Events_Loop::eventByName(EVENT_OBJECT_CREATED);
+        ModelAPI_EventCreator::get()->sendUpdated(aCIter->first, anEvent);
+      } else { // was not concealed become concealed => delete event
+        ModelAPI_EventCreator::get()->sendDeleted(aThis, aCIter->first->groupName());
+      }
+    }
+  }
+}
+
+TDF_Label Model_Document::resultLabel(
+  const boost::shared_ptr<ModelAPI_Data>& theFeatureData, const int theResultIndex) 
+{
+  const boost::shared_ptr<Model_Data>& aData = 
+    boost::dynamic_pointer_cast<Model_Data>(theFeatureData);
+  return aData->label().Father().FindChild(TAG_FEATURE_RESULTS).FindChild(theResultIndex + 1);
 }
 
 void Model_Document::storeResult(boost::shared_ptr<ModelAPI_Data> theFeatureData,
-  boost::shared_ptr<ModelAPI_Result> theResult, const int theResultIndex)
+                                 boost::shared_ptr<ModelAPI_Result> theResult,
+                                 const int theResultIndex)
 {
   boost::shared_ptr<ModelAPI_Document> aThis = 
     Model_Application::getApplication()->getDocument(myID);
   theResult->setDoc(aThis);
-  initData(theResult, boost::dynamic_pointer_cast<Model_Data>(theFeatureData)->label().
-    Father().FindChild(TAG_FEATURE_RESULTS).FindChild(theResultIndex + 1), TAG_FEATURE_ARGUMENTS);
-  if (theResult->data()->name().empty()) { // if was not initialized, generate event and set a name
+  initData(theResult, resultLabel(theFeatureData, theResultIndex), TAG_FEATURE_ARGUMENTS);
+  if (theResult->data()->name().empty()) {  // if was not initialized, generate event and set a name
     theResult->data()->setName(theFeatureData->name());
   }
 }
 
 boost::shared_ptr<ModelAPI_ResultConstruction> Model_Document::createConstruction(
-  const boost::shared_ptr<ModelAPI_Data>& theFeatureData, const int theIndex)
+    const boost::shared_ptr<ModelAPI_Data>& theFeatureData, const int theIndex)
 {
-  ObjectPtr anOldObject = object(boost::dynamic_pointer_cast<Model_Data>(theFeatureData)->
-    label().Father().FindChild(TAG_FEATURE_RESULTS).FindChild(theIndex + 1));
+  TDF_Label aLab = resultLabel(theFeatureData, theIndex);
+  TDataStd_Comment::Set(aLab, ModelAPI_ResultConstruction::group().c_str());
+  ObjectPtr anOldObject = object(aLab);
   boost::shared_ptr<ModelAPI_ResultConstruction> aResult;
   if (anOldObject) {
     aResult = boost::dynamic_pointer_cast<ModelAPI_ResultConstruction>(anOldObject);
@@ -736,10 +880,11 @@ boost::shared_ptr<ModelAPI_ResultConstruction> Model_Document::createConstructio
 }
 
 boost::shared_ptr<ModelAPI_ResultBody> Model_Document::createBody(
-  const boost::shared_ptr<ModelAPI_Data>& theFeatureData, const int theIndex)
+    const boost::shared_ptr<ModelAPI_Data>& theFeatureData, const int theIndex)
 {
-  ObjectPtr anOldObject = object(boost::dynamic_pointer_cast<Model_Data>(theFeatureData)->
-    label().Father().FindChild(TAG_FEATURE_RESULTS).FindChild(theIndex + 1));
+  TDF_Label aLab = resultLabel(theFeatureData, theIndex);
+  TDataStd_Comment::Set(aLab, ModelAPI_ResultBody::group().c_str());
+  ObjectPtr anOldObject = object(aLab);
   boost::shared_ptr<ModelAPI_ResultBody> aResult;
   if (anOldObject) {
     aResult = boost::dynamic_pointer_cast<ModelAPI_ResultBody>(anOldObject);
@@ -752,10 +897,11 @@ boost::shared_ptr<ModelAPI_ResultBody> Model_Document::createBody(
 }
 
 boost::shared_ptr<ModelAPI_ResultPart> Model_Document::createPart(
-  const boost::shared_ptr<ModelAPI_Data>& theFeatureData, const int theIndex)
+    const boost::shared_ptr<ModelAPI_Data>& theFeatureData, const int theIndex)
 {
-  ObjectPtr anOldObject = object(boost::dynamic_pointer_cast<Model_Data>(theFeatureData)->
-    label().Father().FindChild(TAG_FEATURE_RESULTS).FindChild(theIndex + 1));
+  TDF_Label aLab = resultLabel(theFeatureData, theIndex);
+  TDataStd_Comment::Set(aLab, ModelAPI_ResultPart::group().c_str());
+  ObjectPtr anOldObject = object(aLab);
   boost::shared_ptr<ModelAPI_ResultPart> aResult;
   if (anOldObject) {
     aResult = boost::dynamic_pointer_cast<ModelAPI_ResultPart>(anOldObject);
@@ -767,8 +913,25 @@ boost::shared_ptr<ModelAPI_ResultPart> Model_Document::createPart(
   return aResult;
 }
 
+boost::shared_ptr<ModelAPI_ResultGroup> Model_Document::createGroup(
+    const boost::shared_ptr<ModelAPI_Data>& theFeatureData, const int theIndex)
+{
+  TDF_Label aLab = resultLabel(theFeatureData, theIndex);
+  TDataStd_Comment::Set(aLab, ModelAPI_ResultGroup::group().c_str());
+  ObjectPtr anOldObject = object(aLab);
+  boost::shared_ptr<ModelAPI_ResultGroup> aResult;
+  if (anOldObject) {
+    aResult = boost::dynamic_pointer_cast<ModelAPI_ResultGroup>(anOldObject);
+  }
+  if (!aResult) {
+    aResult = boost::shared_ptr<ModelAPI_ResultGroup>(new Model_ResultGroup(theFeatureData));
+    storeResult(theFeatureData, aResult, theIndex);
+  }
+  return aResult;
+}
+
 boost::shared_ptr<ModelAPI_Feature> Model_Document::feature(
-  const boost::shared_ptr<ModelAPI_Result>& theResult)
+    const boost::shared_ptr<ModelAPI_Result>& theResult)
 {
   boost::shared_ptr<Model_Data> aData = boost::dynamic_pointer_cast<Model_Data>(theResult->data());
   if (aData) {
@@ -778,12 +941,59 @@ boost::shared_ptr<ModelAPI_Feature> Model_Document::feature(
   return FeaturePtr();
 }
 
-Standard_Integer HashCode(const TDF_Label& theLab,const Standard_Integer theUpper)
+void Model_Document::updateResults(FeaturePtr theFeature)
+{
+  // for not persistent is will be done by parametric updater automatically
+  if (!theFeature->isPersistentResult()) return;
+  // check the existing results and remove them if there is nothing on the label
+  std::list<ResultPtr>::const_iterator aResIter = theFeature->results().cbegin();
+  while(aResIter != theFeature->results().cend()) {
+    ResultBodyPtr aBody = boost::dynamic_pointer_cast<ModelAPI_ResultBody>(*aResIter);
+    if (aBody) {
+      if (!aBody->data()->isValid()) { 
+        // found a disappeared result => remove it
+        theFeature->removeResult(aBody);
+        // start iterate from beginning because iterator is corrupted by removing
+        aResIter = theFeature->results().cbegin();
+        continue;
+      }
+    }
+    aResIter++;
+  }
+  // check that results are presented on all labels
+  int aResSize = theFeature->results().size();
+  TDF_ChildIterator aLabIter(resultLabel(theFeature->data(), 0).Father());
+  for(; aLabIter.More(); aLabIter.Next()) {
+    // here must be GUID of the feature
+    int aResIndex = aLabIter.Value().Tag() - 1;
+    ResultPtr aNewBody;
+    if (aResSize <= aResIndex) {
+      TDF_Label anArgLab = aLabIter.Value();
+      Handle(TDataStd_Comment) aGroup;
+      if (anArgLab.FindAttribute(TDataStd_Comment::GetID(), aGroup)) {
+        if (aGroup->Get() == ModelAPI_ResultBody::group().c_str()) {
+          aNewBody = createBody(theFeature->data(), aResIndex);
+        } else if (aGroup->Get() == ModelAPI_ResultPart::group().c_str()) {
+          aNewBody = createPart(theFeature->data(), aResIndex);
+        } else if (aGroup->Get() != ModelAPI_ResultConstruction::group().c_str() &&
+          aGroup->Get() != ModelAPI_ResultGroup::group().c_str()) {
+          Events_Error::send(std::string("Unknown type of result is found in the document:") +
+            TCollection_AsciiString(aGroup->Get()).ToCString());
+        }
+      }
+      if (aNewBody) {
+        theFeature->setResult(aNewBody, aResIndex);
+      }
+    }
+  }
+}
+
+Standard_Integer HashCode(const TDF_Label& theLab, const Standard_Integer theUpper)
 {
   return TDF_LabelMapHasher::HashCode(theLab, theUpper);
 
 }
-Standard_Boolean IsEqual(const TDF_Label& theLab1,const TDF_Label& theLab2)
+Standard_Boolean IsEqual(const TDF_Label& theLab1, const TDF_Label& theLab2)
 {
   return TDF_LabelMapHasher::IsEqual(theLab1, theLab2);
 }