diff --git a/core/attributedef.class.inc.php b/core/attributedef.class.inc.php
index 438ec07e8..580bab4f4 100644
--- a/core/attributedef.class.inc.php
+++ b/core/attributedef.class.inc.php
@@ -279,7 +279,7 @@ abstract class AttributeDefinition
 	 */
 	public function CheckValue(DBObject $oHostObject, $value)
 	{
-		// todo: factorize here the cases implemented into DBObject
+		// later: factorize here the cases implemented into DBObject
 		return true;
 	}
 
@@ -5898,8 +5898,10 @@ class AttributeExternalField extends AttributeDefinition
  * @see TagSetFieldData
  * @since 2.6 N°931 tag fields
  */
-class AttributeTagSet extends AttributeString
+class AttributeTagSet extends AttributeDBField
 {
+    const SEARCH_WIDGET_TYPE = self::SEARCH_WIDGET_TYPE_STRING;
+
     public function GetEditClass() {
         return "String";
     }
@@ -5920,11 +5922,16 @@ class AttributeTagSet extends AttributeString
 
     protected function GetSQLCol($bFullSpec = false)
     {
-        return 'VARCHAR(1024)'
+        return 'VARCHAR(255)'
             .CMDBSource::GetSqlStringColumnDefinition()
             .($bFullSpec ? $this->GetSQLColSpec() : '');
     }
 
+    public function GetMaxSize()
+    {
+        return 255;
+    }
+
     public function RequiresIndex() {return true;}
 
 	public function RequiresFullTextIndex() {return true;}
@@ -5937,16 +5944,6 @@ class AttributeTagSet extends AttributeString
         return ($val1 == $val2);
     }
 
-    public function GetType()
-    {
-        return Dict::S('Core:TagSetFieldData');
-    }
-
-    public function GetTypeDesc()
-    {
-        return Dict::S('Core:TagSetFieldData+');
-    }
-
     /**
      * force an allowed value (type conversion and possibly forces a value as mySQL would do upon writing!
      *
@@ -5964,9 +5961,43 @@ class AttributeTagSet extends AttributeString
             $aTagCodes = explode(' ', "$proposedValue");
             $oTagSet->SetValue($aTagCodes);
         }
+        elseif ($proposedValue instanceof ormTagSet)
+        {
+            $oTagSet = $proposedValue;
+        }
         return $oTagSet;
     }
 
+
+    public function GetNullValue() {
+        return new ormTagSet(MetaModel::GetAttributeOrigin($this->GetHostClass(), $this->GetCode()), $this->GetCode());
+    }
+
+    public function IsNull($proposedValue)
+    {
+        /** @var \ormTagSet $proposedValue */
+        return count($proposedValue->GetValue()) == 0;
+    }
+
+    /**
+     * To be overloaded for localized enums
+     *
+     * @param $sValue
+     *
+     * @return string label corresponding to the given value (in plain text)
+     */
+    public function GetValueLabel($sValue)
+    {
+        // TODO
+        return $sValue;
+    }
+
+    /**
+     * @param $value
+     *
+     * @return string
+     * @throws \CoreWarning
+     */
     public function ScalarToSQL($value)
     {
         if (empty($value))
@@ -5992,6 +6023,7 @@ class AttributeTagSet extends AttributeString
      */
     public function GetAsHTML($value, $oHostObject = null, $bLocalize = true)
     {
+        // TODO $bLocalize = true
         if (is_object($value) && ($value instanceof ormTagSet))
         {
             $aValues = $value->GetValue();
@@ -6010,6 +6042,7 @@ class AttributeTagSet extends AttributeString
      */
     public function GetAsXML($value, $oHostObject = null, $bLocalize = true)
     {
+        // TODO $bLocalize = true
         if (is_object($value) && ($value instanceof ormTagSet))
         {
             $sRes = "<Set>\n";
@@ -6040,19 +6073,16 @@ class AttributeTagSet extends AttributeString
      */
     public function GetAsCSV($value, $sSeparator = ',', $sTextQualifier = '"', $oHostObject = null, $bLocalize = true, $bConvertToPlainText = false)
     {
-        $sSepItem = MetaModel::GetConfig()->Get('link_set_item_separator');
-
+        // TODO $bLocalize = true
         if (is_object($value) && ($value instanceof ormTagSet))
         {
             $aValues = $value->GetValue();
-            $sRes = implode($sSepItem, $aValues);
+            $sRes = implode(' ', $aValues);
         }
         else
         {
             $sRes = '';
         }
-        $sRes = str_replace($sTextQualifier, $sTextQualifier.$sTextQualifier, $sRes);
-        $sRes = $sTextQualifier.$sRes.$sTextQualifier;
         return $sRes;
     }
 
@@ -6080,6 +6110,7 @@ class AttributeTagSet extends AttributeString
      */
     public function GetForTemplate($value, $sVerb, $oHostObject = null, $bLocalize = true)
     {
+        // TODO $bLocalize = true
         if (is_object($value) && ($value instanceof ormTagSet))
         {
             $aValues = $value->GetValue();
@@ -6087,7 +6118,7 @@ class AttributeTagSet extends AttributeString
             switch ($sVerb)
             {
                 case '':
-                    return implode("\n", $aValues);
+                    return implode(' ', $aValues);
 
                 case 'html':
                     return '<ul><li>'.implode("</li><li>", $aValues).'</li></ul>';
diff --git a/dictionaries/en.dictionary.itop.core.php b/dictionaries/en.dictionary.itop.core.php
index 3664f03bc..a46a8c531 100644
--- a/dictionaries/en.dictionary.itop.core.php
+++ b/dictionaries/en.dictionary.itop.core.php
@@ -37,6 +37,12 @@ Dict::Add('EN US', 'English', 'English', array(
     'Core:AttributeTagSet' => 'List of tags',
     'Core:AttributeTagSet+' => '',
 
+    'Core:AttributeCaseLog' => 'Log',
+    'Core:AttributeCaseLog+' => '',
+
+    'Core:AttributeMetaEnum' => 'Computed enum',
+    'Core:AttributeMetaEnum+' => '',
+
     'Core:AttributeLinkedSetIndirect' => 'Array of objects (N-N)',
 	'Core:AttributeLinkedSetIndirect+' => 'Any kind of objects [subclass] of the same class',
 
@@ -620,7 +626,7 @@ Dict::Add('EN US', 'English', 'English', array(
 	'Class:SynchroDataSource/Attribute:name' => 'Name',
 	'Class:SynchroDataSource/Attribute:name+' => 'Name',
 	'Class:SynchroDataSource/Attribute:description' => 'Description',
-	'Class:SynchroDataSource/Attribute:status' => 'Status', //TODO: enum values
+	'Class:SynchroDataSource/Attribute:status' => 'Status',
 	'Class:SynchroDataSource/Attribute:scope_class' => 'Target class',
 	'Class:SynchroDataSource/Attribute:user_id' => 'User',
 	'Class:SynchroDataSource/Attribute:notify_contact_id' => 'Contact to notify',
@@ -629,7 +635,7 @@ Dict::Add('EN US', 'English', 'English', array(
 	'Class:SynchroDataSource/Attribute:url_icon+' => 'Hyperlink a (small) image representing the application with which iTop is synchronized',
 	'Class:SynchroDataSource/Attribute:url_application' => 'Application\'s hyperlink',
 	'Class:SynchroDataSource/Attribute:url_application+' => 'Hyperlink to the iTop object in the external application with which iTop is synchronized (if applicable). Possible placeholders: $this->attribute$ and $replica->primary_key$',
-	'Class:SynchroDataSource/Attribute:reconciliation_policy' => 'Reconciliation policy', //TODO enum values
+	'Class:SynchroDataSource/Attribute:reconciliation_policy' => 'Reconciliation policy',
 	'Class:SynchroDataSource/Attribute:full_load_periodicity' => 'Full load interval',
 	'Class:SynchroDataSource/Attribute:full_load_periodicity+' => 'A complete reload of all data must occur at least as often as specified here',
 	'Class:SynchroDataSource/Attribute:action_on_zero' => 'Action on zero',
@@ -640,7 +646,6 @@ Dict::Add('EN US', 'English', 'English', array(
 	'Class:SynchroDataSource/Attribute:action_on_multiple+' => 'Action taken when the search returns more than one object',
 	'Class:SynchroDataSource/Attribute:user_delete_policy' => 'Users allowed',
 	'Class:SynchroDataSource/Attribute:user_delete_policy+' => 'Who is allowed to delete synchronized objects',
-	'Class:SynchroDataSource/Attribute:user_delete_policy' => 'Users allowed',
 	'Class:SynchroDataSource/Attribute:delete_policy/Value:never' => 'Nobody',
 	'Class:SynchroDataSource/Attribute:delete_policy/Value:depends' => 'Administrators only',
 	'Class:SynchroDataSource/Attribute:delete_policy/Value:always' => 'All allowed users',
@@ -691,7 +696,6 @@ Dict::Add('EN US', 'English', 'English', array(
 	'Core:Synchro:label_obj_new_updated' => 'Updated (%1$s)',
 	'Core:Synchro:label_obj_created' => 'Created (%1$s)',
 	'Core:Synchro:label_obj_new_errors' => 'Errors (%1$s)',
-	'Core:Synchro:History' => 'Synchronization History',
 	'Core:SynchroLogTitle' => '%1$s - %2$s',
 	'Core:Synchro:Nb_Replica' => 'Replica processed: %1$s',
 	'Core:Synchro:Nb_Class:Objects' => '%1$s: %2$s',
@@ -905,3 +909,11 @@ Dict::Add('EN US', 'English', 'English', array(
 	'Core:Validator:MustBeInteger' => 'Must be an integer',
 	'Core:Validator:MustSelectOne' => 'Please, select one',
 ));
+
+//
+// Class: TagSetFieldData
+//
+Dict::Add('EN US', 'English', 'English', array(
+    'Class:TagSetFieldData' => 'List of tags',
+    'Class:TagSetFieldData+' => '',
+));
diff --git a/setup/compiler.class.inc.php b/setup/compiler.class.inc.php
index 1099bde05..e64074cb0 100644
--- a/setup/compiler.class.inc.php
+++ b/setup/compiler.class.inc.php
@@ -1395,7 +1395,7 @@ EOF
                     $aParameters['sql'] = $this->GetMandatoryPropString($oField, 'sql');
                     $aParameters['is_null_allowed'] = $this->GetPropBoolean($oField, 'is_null_allowed', false);
                     $aParameters['depends_on'] = $sDependencies;
-                    $aParameters['default_value'] = $this->GetPropString($oField, 'default_value', '');
+                    $aParameters['default_value'] = '';
                 }
                 else
 				{
@@ -1406,8 +1406,6 @@ EOF
                     $aParameters['depends_on'] = $sDependencies;
 				}
 
-
-
 				// Optional parameters (more for historical reasons)
 				// Added if present...
 				//