diff --git a/apps/opencs/view/world/genericcreator.cpp b/apps/opencs/view/world/genericcreator.cpp
index d23fc2803..bbdf2f67b 100644
--- a/apps/opencs/view/world/genericcreator.cpp
+++ b/apps/opencs/view/world/genericcreator.cpp
@@ -10,6 +10,8 @@
 #include <QLabel>
 #include <QComboBox>
 
+#include <components/misc/stringops.hpp>
+
 #include "../../model/world/commands.hpp"
 #include "../../model/world/data.hpp"
 #include "../../model/world/idtable.hpp"
@@ -24,9 +26,6 @@ void CSVWorld::GenericCreator::update()
     mId->setToolTip (QString::fromUtf8 (mErrors.c_str()));
 
     mCreate->setEnabled (mErrors.empty() && !mLocked);
-
-    if (mNamespace)
-        mNamespace->setText (QString::fromUtf8 (getNamespace().c_str()));
 }
 
 void CSVWorld::GenericCreator::setManualEditing (bool enabled)
@@ -87,17 +86,40 @@ std::string CSVWorld::GenericCreator::getNamespace() const
     return "";
 }
 
+void CSVWorld::GenericCreator::updateNamespace()
+{
+    std::string namespace_ = getNamespace();
+
+    mValidator->setNamespace (namespace_);
+
+    int index = mId->text().indexOf ("::");
+
+    if (index==-1)
+    {
+        // no namespace in old text
+        mId->setText (QString::fromUtf8 (namespace_.c_str()) + mId->text());
+    }
+    else
+    {
+        std::string oldNamespace =
+            Misc::StringUtils::lowerCase (mId->text().left (index).toUtf8().constData());
+
+        if (oldNamespace=="project" || oldNamespace=="session")
+            mId->setText (QString::fromUtf8 (namespace_.c_str()) + mId->text().mid (index+2));
+    }
+}
+
 CSVWorld::GenericCreator::GenericCreator (CSMWorld::Data& data, QUndoStack& undoStack,
     const CSMWorld::UniversalId& id, bool relaxedIdRules)
 : mData (data), mUndoStack (undoStack), mListId (id), mLocked (false), mCloneMode (false),
   mClonedType (CSMWorld::UniversalId::Type_None), mScopes (CSMWorld::Scope_Content), mScope (0),
-  mScopeLabel (0), mNamespace (0)
+  mScopeLabel (0)
 {
     mLayout = new QHBoxLayout;
     mLayout->setContentsMargins (0, 0, 0, 0);
 
     mId = new QLineEdit;
-    mId->setValidator (new IdValidator (relaxedIdRules, this));
+    mId->setValidator (mValidator = new IdValidator (relaxedIdRules, this));
     mLayout->addWidget (mId, 1);
 
     mCreate = new QPushButton ("Create");
@@ -125,6 +147,7 @@ void CSVWorld::GenericCreator::reset()
     mCloneMode = false;
     mId->setText ("");
     update();
+    updateNamespace();
 }
 
 std::string CSVWorld::GenericCreator::getErrors() const
@@ -197,21 +220,6 @@ void CSVWorld::GenericCreator::setScope (unsigned int scope)
     int count = (mScopes & CSMWorld::Scope_Content) + (mScopes & CSMWorld::Scope_Project) +
         (mScopes & CSMWorld::Scope_Session);
 
-    // namespace widget
-    if (count>1 || (count>0 && !(mScopes & CSMWorld::Scope_Content)))
-    {
-        if (!mNamespace)
-        {
-            mNamespace = new QLabel ("::", this);
-            insertAtBeginning (mNamespace, false);
-        }
-    }
-    else
-    {
-        delete mNamespace;
-        mNamespace = 0;
-    }
-
     // scope selector widget
     if (count>1)
     {
@@ -242,9 +250,12 @@ void CSVWorld::GenericCreator::setScope (unsigned int scope)
         delete mScopeLabel;
         mScopeLabel = 0;
     }
+
+    updateNamespace();
 }
 
 void CSVWorld::GenericCreator::scopeChanged (int index)
 {
     update();
+    updateNamespace();
 }
\ No newline at end of file
diff --git a/apps/opencs/view/world/genericcreator.hpp b/apps/opencs/view/world/genericcreator.hpp
index fdd743489..ea099248e 100644
--- a/apps/opencs/view/world/genericcreator.hpp
+++ b/apps/opencs/view/world/genericcreator.hpp
@@ -19,6 +19,8 @@ namespace CSMWorld
 
 namespace CSVWorld
 {
+    class IdValidator;
+
     class GenericCreator : public Creator
     {
             Q_OBJECT
@@ -36,7 +38,7 @@ namespace CSVWorld
             unsigned int mScopes;
             QComboBox *mScope;
             QLabel *mScopeLabel;
-            QLabel *mNamespace;
+            IdValidator *mValidator;
 
         protected:
             bool mCloneMode;
@@ -62,6 +64,10 @@ namespace CSVWorld
 
             std::string getNamespace() const;
 
+        private:
+
+            void updateNamespace();
+
         public:
 
             GenericCreator (CSMWorld::Data& data, QUndoStack& undoStack,
diff --git a/apps/opencs/view/world/idvalidator.cpp b/apps/opencs/view/world/idvalidator.cpp
index 7c210daae..5f4cd2194 100644
--- a/apps/opencs/view/world/idvalidator.cpp
+++ b/apps/opencs/view/world/idvalidator.cpp
@@ -1,6 +1,8 @@
 
 #include "idvalidator.hpp"
 
+#include <components/misc/stringops.hpp>
+
 bool CSVWorld::IdValidator::isValid (const QChar& c, bool first) const
 {
     if (c.isLetter() || c=='_')
@@ -26,11 +28,74 @@ QValidator::State CSVWorld::IdValidator::validate (QString& input, int& pos) con
     else
     {
         bool first = true;
+        bool scope = false;
+        bool prevScope = false;
 
-        for (QString::const_iterator iter (input.begin()); iter!=input.end(); ++iter, first = false)
-            if (!isValid (*iter, first))
-                return QValidator::Invalid;
+        QString::const_iterator iter = input.begin();
+
+        if (!mNamespace.empty())
+        {
+            std::string namespace_ = input.left (mNamespace.size()).toUtf8().constData();
+
+            if (Misc::StringUtils::lowerCase (namespace_)!=mNamespace)
+                return QValidator::Invalid; // incorrect namespace
+
+            iter += namespace_.size();
+            first = false;
+            prevScope = true;
+        }
+        else
+        {
+            int index = input.indexOf (":");
+
+            if (index!=-1)
+            {
+                QString namespace_ = input.left (index);
+
+                if (namespace_=="project" || namespace_=="session")
+                    return QValidator::Invalid; // reserved namespace
+            }
+        }
+
+        for (; iter!=input.end(); ++iter, first = false)
+        {
+            if (*iter==':')
+            {
+                if (first)
+                    return QValidator::Invalid; // scope operator at the beginning
+
+                if (scope)
+                {
+                    scope = false;
+                    prevScope = true;
+                }
+                else
+                {
+                    if (prevScope)
+                        return QValidator::Invalid; // sequence of two scope operators
+
+                    scope = true;
+                }
+            }
+            else if (scope)
+                return QValidator::Invalid; // incomplete scope operator
+            else
+            {
+                prevScope = false;
+
+                if (!isValid (*iter, first))
+                    return QValidator::Invalid;
+            }
+        }
+
+        if (prevScope)
+            return QValidator::Intermediate; // ending with scope operator
     }
 
     return QValidator::Acceptable;
+}
+
+void CSVWorld::IdValidator::setNamespace (const std::string& namespace_)
+{
+    mNamespace = Misc::StringUtils::lowerCase (namespace_);
 }
\ No newline at end of file
diff --git a/apps/opencs/view/world/idvalidator.hpp b/apps/opencs/view/world/idvalidator.hpp
index 8ca162440..4b3e6cf6a 100644
--- a/apps/opencs/view/world/idvalidator.hpp
+++ b/apps/opencs/view/world/idvalidator.hpp
@@ -1,6 +1,8 @@
 #ifndef CSV_WORLD_IDVALIDATOR_H
 #define CSV_WORLD_IDVALIDATOR_H
 
+#include <string>
+
 #include <QValidator>
 
 namespace CSVWorld
@@ -8,6 +10,7 @@ namespace CSVWorld
     class IdValidator : public QValidator
     {
             bool mRelaxed;
+            std::string mNamespace;
 
         private:
 
@@ -20,6 +23,8 @@ namespace CSVWorld
 
             virtual State validate (QString& input, int& pos) const;
 
+            void setNamespace (const std::string& namespace_);
+
     };
 }