diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
index a7ab028..3d722a2 100644
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -1,129 +1,134 @@
 <?php
 
 /**
  * This file is automatically generated. Use 'arc liberate' to rebuild it.
  *
  * @generated
  * @phutil-library-version 2
  */
 phutil_register_library_map(array(
   '__library_version__' => 2,
   'class' => array(
     'SemiStructuredBaseController' => 'applications/semistruct/controller/SemiStructuredBaseController.php',
     'SemiStructuredDAO' => 'applications/semistruct/storage/SemiStructuredDAO.php',
     'SemiStructuredDataApplication' => 'applications/semistruct/application/SemiStructuredDataApplication.php',
     'SemiStructuredInstanceConfiguredCustomField' => 'applications/semistruct/customfield/SemiStructuredConfiguredCustomField.php',
     'SemiStructuredInstanceConfiguredCustomFieldStorage' => 'applications/semistruct/storage/SemiStructuredInstanceConfiguredCustomFieldStorage.php',
     'SemiStructuredInstanceCustomField' => 'applications/semistruct/customfield/SemiStructuredInstanceCustomField.php',
     'SemiStructuredInstanceCustomFieldNumericIndex' => 'applications/semistruct/storage/SemiStructuredInstanceCustomFieldNumericIndex.php',
     'SemiStructuredInstanceCustomFieldStringIndex' => 'applications/semistruct/storage/SemiStructuredInstanceCustomFieldStringIndex.php',
     'SemiStructuredObjectInstance' => 'applications/semistruct/storage/SemiStructuredObjectInstance.php',
     'SemiStructuredObjectInstanceClassTransaction' => 'applications/semistruct/xaction/instance/SemiStructuredObjectInstanceClassTransaction.php',
     'SemiStructuredObjectInstanceController' => 'applications/semistruct/controller/instance/SemiStructuredObjectInstanceController.php',
     'SemiStructuredObjectInstanceDescriptionTransaction' => 'applications/semistruct/xaction/instance/SemiStructuredObjectInstanceDescriptionTransaction.php',
     'SemiStructuredObjectInstanceEditController' => 'applications/semistruct/controller/instance/SemiStructuredObjectInstanceEditController.php',
     'SemiStructuredObjectInstanceEditEngine' => 'applications/semistruct/editor/SemiStructuredObjectInstanceEditEngine.php',
     'SemiStructuredObjectInstanceListController' => 'applications/semistruct/controller/instance/SemiStructuredObjectInstanceListController.php',
     'SemiStructuredObjectInstanceNameTransaction' => 'applications/semistruct/xaction/instance/SemiStructuredObjectInstanceNameTransaction.php',
     'SemiStructuredObjectInstancePHIDType' => 'applications/semistruct/phid/SemiStructuredObjectInstancePHIDType.php',
     'SemiStructuredObjectInstanceQuery' => 'applications/semistruct/query/SemiStructuredObjectInstanceQuery.php',
     'SemiStructuredObjectInstanceRawDataTransaction' => 'applications/semistruct/xaction/instance/SemiStructuredObjectInstanceRawDataTransaction.php',
     'SemiStructuredObjectInstanceSearchEngine' => 'applications/semistruct/query/SemiStructuredObjectInstanceSearchEngine.php',
     'SemiStructuredObjectInstanceTransaction' => 'applications/semistruct/storage/SemiStructuredObjectInstanceTransaction.php',
     'SemiStructuredObjectInstanceTransactionComment' => 'applications/semistruct/storage/SemiStructuredObjectInstanceTransactionComment.php',
     'SemiStructuredObjectInstanceTransactionEditor' => 'applications/semistruct/editor/SemiStructuredObjectInstanceTransactionEditor.php',
     'SemiStructuredObjectInstanceTransactionQuery' => 'applications/semistruct/query/SemiStructuredObjectInstanceTransactionQuery.php',
     'SemiStructuredObjectInstanceTransactionType' => 'applications/semistruct/xaction/instance/SemiStructuredObjectInstanceTransactionType.php',
     'SemiStructuredObjectInstanceViewController' => 'applications/semistruct/controller/instance/SemiStructuredObjectInstanceViewController.php',
     'SemiStructuredObjectNewInstanceController' => 'applications/semistruct/controller/class/SemiStructuredObjectNewInstanceController.php',
     'SemiStructuredObjectType' => 'applications/semistruct/storage/SemiStructuredObjectType.php',
     'SemiStructuredObjectTypeArchiveController' => 'applications/semistruct/controller/class/SemiStructuredObjectTypeArchiveController.php',
     'SemiStructuredObjectTypeController' => 'applications/semistruct/controller/class/SemiStructuredObjectTypeController.php',
     'SemiStructuredObjectTypeCustomFieldsTransaction' => 'applications/semistruct/xaction/class/SemiStructuredObjectTypeCustomFieldsTransaction.php',
     'SemiStructuredObjectTypeDescriptionTransaction' => 'applications/semistruct/xaction/class/SemiStructuredObjectTypeDescriptionTransaction.php',
     'SemiStructuredObjectTypeEditController' => 'applications/semistruct/controller/class/SemiStructuredObjectTypeEditController.php',
     'SemiStructuredObjectTypeEditEngine' => 'applications/semistruct/editor/SemiStructuredObjectTypeEditEngine.php',
     'SemiStructuredObjectTypeFerretEngine' => 'applications/semistruct/engine/SemiStructuredObjectTypeFerretEngine.php',
     'SemiStructuredObjectTypeListController' => 'applications/semistruct/controller/class/SemiStructuredObjectTypeListController.php',
+    'SemiStructuredObjectTypeMailReceiver' => 'applications/semistruct/mail/SemiStructuredObjectTypeMailReceiver.php',
     'SemiStructuredObjectTypeNameTransaction' => 'applications/semistruct/xaction/class/SemiStructuredObjectTypeNameTransaction.php',
     'SemiStructuredObjectTypePHIDType' => 'applications/semistruct/phid/SemiStructuredObjectTypePHIDType.php',
     'SemiStructuredObjectTypeQuery' => 'applications/semistruct/query/SemiStructuredObjectTypeQuery.php',
+    'SemiStructuredObjectTypeReplyHandler' => 'applications/semistruct/mail/SemiStructuredObjectTypeReplyHandler.php',
     'SemiStructuredObjectTypeSearchEngine' => 'applications/semistruct/query/SemiStructuredObjectTypeSearchEngine.php',
     'SemiStructuredObjectTypeStatusTransaction' => 'applications/semistruct/xaction/class/SemiStructuredObjectTypeStatusTransaction.php',
     'SemiStructuredObjectTypeTransaction' => 'applications/semistruct/storage/SemiStructuredObjectTypeTransaction.php',
     'SemiStructuredObjectTypeTransactionComment' => 'applications/semistruct/storage/SemiStructuredObjectTypeTransactionComment.php',
     'SemiStructuredObjectTypeTransactionEditor' => 'applications/semistruct/editor/SemiStructuredObjectTypeTransactionEditor.php',
     'SemiStructuredObjectTypeTransactionQuery' => 'applications/semistruct/query/SemiStructuredObjectTypeTransactionQuery.php',
     'SemiStructuredObjectTypeTransactionType' => 'applications/semistruct/xaction/class/SemiStructuredObjectTypeTransactionType.php',
     'SemiStructuredObjectTypeViewController' => 'applications/semistruct/controller/class/SemiStructuredObjectTypeViewController.php',
     'SemiStructuredPatchList' => 'applications/semistruct/storage/SemiStructuredPatchList.php',
   ),
   'function' => array(),
   'xmap' => array(
     'SemiStructuredBaseController' => 'PhabricatorController',
     'SemiStructuredDAO' => 'PhabricatorLiskDAO',
     'SemiStructuredDataApplication' => 'PhabricatorApplication',
     'SemiStructuredInstanceConfiguredCustomField' => array(
       'SemiStructuredInstanceCustomField',
       'PhabricatorStandardCustomFieldInterface',
     ),
     'SemiStructuredInstanceConfiguredCustomFieldStorage' => 'PhabricatorCustomFieldStorage',
     'SemiStructuredInstanceCustomField' => 'PhabricatorCustomField',
     'SemiStructuredInstanceCustomFieldNumericIndex' => 'PhabricatorCustomFieldNumericIndexStorage',
     'SemiStructuredInstanceCustomFieldStringIndex' => 'PhabricatorCustomFieldStringIndexStorage',
     'SemiStructuredObjectInstance' => array(
       'SemiStructuredDAO',
       'PhabricatorPolicyInterface',
       'PhabricatorApplicationTransactionInterface',
       'PhabricatorFlaggableInterface',
       'PhabricatorCustomFieldInterface',
       'PhabricatorDestructibleInterface',
     ),
     'SemiStructuredObjectInstanceClassTransaction' => 'SemiStructuredObjectInstanceTransactionType',
     'SemiStructuredObjectInstanceController' => 'SemiStructuredBaseController',
     'SemiStructuredObjectInstanceDescriptionTransaction' => 'SemiStructuredObjectInstanceTransactionType',
     'SemiStructuredObjectInstanceEditController' => 'SemiStructuredBaseController',
     'SemiStructuredObjectInstanceEditEngine' => 'PhabricatorEditEngine',
     'SemiStructuredObjectInstanceListController' => 'SemiStructuredObjectTypeController',
     'SemiStructuredObjectInstanceNameTransaction' => 'SemiStructuredObjectInstanceTransactionType',
     'SemiStructuredObjectInstancePHIDType' => 'PhabricatorPHIDType',
     'SemiStructuredObjectInstanceQuery' => 'PhabricatorCursorPagedPolicyAwareQuery',
     'SemiStructuredObjectInstanceRawDataTransaction' => 'SemiStructuredObjectInstanceTransactionType',
     'SemiStructuredObjectInstanceSearchEngine' => 'PhabricatorApplicationSearchEngine',
     'SemiStructuredObjectInstanceTransaction' => 'PhabricatorModularTransaction',
     'SemiStructuredObjectInstanceTransactionComment' => 'PhabricatorApplicationTransactionComment',
     'SemiStructuredObjectInstanceTransactionEditor' => 'PhabricatorApplicationTransactionEditor',
     'SemiStructuredObjectInstanceTransactionQuery' => 'PhabricatorApplicationTransactionQuery',
     'SemiStructuredObjectInstanceTransactionType' => 'PhabricatorModularTransactionType',
     'SemiStructuredObjectInstanceViewController' => 'SemiStructuredObjectInstanceController',
     'SemiStructuredObjectNewInstanceController' => 'SemiStructuredObjectTypeController',
     'SemiStructuredObjectType' => array(
       'SemiStructuredDAO',
       'PhabricatorPolicyInterface',
       'PhabricatorApplicationTransactionInterface',
+      'PhabricatorSubscribableInterface',
       'PhabricatorFlaggableInterface',
       'PhabricatorDestructibleInterface',
       'PhabricatorFerretInterface',
     ),
     'SemiStructuredObjectTypeArchiveController' => 'SemiStructuredBaseController',
     'SemiStructuredObjectTypeController' => 'SemiStructuredBaseController',
     'SemiStructuredObjectTypeCustomFieldsTransaction' => 'SemiStructuredObjectTypeTransactionType',
     'SemiStructuredObjectTypeDescriptionTransaction' => 'SemiStructuredObjectTypeTransactionType',
     'SemiStructuredObjectTypeEditController' => 'SemiStructuredBaseController',
     'SemiStructuredObjectTypeEditEngine' => 'PhabricatorEditEngine',
     'SemiStructuredObjectTypeFerretEngine' => 'PhabricatorFerretEngine',
     'SemiStructuredObjectTypeListController' => 'SemiStructuredBaseController',
+    'SemiStructuredObjectTypeMailReceiver' => 'PhabricatorObjectMailReceiver',
     'SemiStructuredObjectTypeNameTransaction' => 'SemiStructuredObjectTypeTransactionType',
     'SemiStructuredObjectTypePHIDType' => 'PhabricatorPHIDType',
     'SemiStructuredObjectTypeQuery' => 'PhabricatorCursorPagedPolicyAwareQuery',
+    'SemiStructuredObjectTypeReplyHandler' => 'PhabricatorApplicationTransactionReplyHandler',
     'SemiStructuredObjectTypeSearchEngine' => 'PhabricatorApplicationSearchEngine',
     'SemiStructuredObjectTypeStatusTransaction' => 'SemiStructuredObjectTypeTransactionType',
     'SemiStructuredObjectTypeTransaction' => 'PhabricatorModularTransaction',
     'SemiStructuredObjectTypeTransactionComment' => 'PhabricatorApplicationTransactionComment',
     'SemiStructuredObjectTypeTransactionEditor' => 'PhabricatorApplicationTransactionEditor',
     'SemiStructuredObjectTypeTransactionQuery' => 'PhabricatorApplicationTransactionQuery',
     'SemiStructuredObjectTypeTransactionType' => 'PhabricatorModularTransactionType',
     'SemiStructuredObjectTypeViewController' => 'SemiStructuredObjectTypeController',
     'SemiStructuredPatchList' => 'PhabricatorSQLPatchList',
   ),
 ));
diff --git a/src/editor/SemiStructuredObjectTypeTransactionEditor.php b/src/editor/SemiStructuredObjectTypeTransactionEditor.php
index 05c241d..5dd0921 100644
--- a/src/editor/SemiStructuredObjectTypeTransactionEditor.php
+++ b/src/editor/SemiStructuredObjectTypeTransactionEditor.php
@@ -1,28 +1,76 @@
 <?php
 
 final class SemiStructuredObjectTypeTransactionEditor
   extends PhabricatorApplicationTransactionEditor {
 
   public function getEditorApplicationClass() {
     return 'SemiStructuredDataApplication';
   }
 
   public function getEditorObjectsDescription() {
     return pht('Object Types');
   }
 
   public function getTransactionTypes() {
     $types = parent::getTransactionTypes();
 
     $types[] = PhabricatorTransactions::TYPE_VIEW_POLICY;
     $types[] = PhabricatorTransactions::TYPE_EDIT_POLICY;
     $types[] = PhabricatorTransactions::TYPE_EDGE;
 
     return $types;
   }
 
   protected function supportsSearch() {
     return true;
   }
 
+
+  protected function shouldPublishFeedStory(
+    PhabricatorLiskDAO $object,
+    array $xactions) {
+    return true;
+  }
+
+  protected function shouldSendMail(
+    PhabricatorLiskDAO $object,
+    array $xactions) {
+    return true;
+  }
+
+
+  protected function buildMailTemplate(PhabricatorLiskDAO $object) {
+    $name = $object->getName();
+    $id = $object->getID();
+    $subject = pht('Object Type %d: %s', $id, $name);
+
+    return id(new PhabricatorMetaMTAMail())
+      ->setSubject($subject);
+  }
+
+  protected function buildReplyHandler(PhabricatorLiskDAO $object) {
+    return id(new SemiStructuredObjectTypeReplyHandler())
+      ->setMailReceiver($object);
+  }
+
+  protected function getMailTo(PhabricatorLiskDAO $object) {
+    return array(
+      $this->requireActor()->getPHID(),
+    );
+  }
+
+  protected function buildMailBody(
+    PhabricatorLiskDAO $object,
+    array $xactions) {
+
+    $body = parent::buildMailBody($object, $xactions);
+
+    $body->addLinkSection(pht('OBJECT TYPE DETAIL'), $object->getURI());
+    return $body;
+  }
+
+  protected function getMailSubjectPrefix() {
+    return pht('[Semi-Structured]');
+  }
+
 }
diff --git a/src/mail/SemiStructuredObjectTypeMailReceiver.php b/src/mail/SemiStructuredObjectTypeMailReceiver.php
new file mode 100644
index 0000000..8f8077a
--- /dev/null
+++ b/src/mail/SemiStructuredObjectTypeMailReceiver.php
@@ -0,0 +1,28 @@
+<?php
+
+final class SemiStructuredObjectTypeMailReceiver
+  extends PhabricatorObjectMailReceiver {
+
+  public function isEnabled() {
+    return PhabricatorApplication::isClassInstalled(
+      'SemiStructuredDataApplication');
+  }
+
+  protected function getObjectPattern() {
+    return 'SSCL[1-9]\d*';
+  }
+
+  protected function loadObject($pattern, PhabricatorUser $viewer) {
+    $id = (int)substr($pattern, 4);
+
+    return id(new SemiStructuredObjectTypeQuery())
+      ->setViewer($viewer)
+      ->withIDs(array($id))
+      ->executeOne();
+  }
+
+  protected function getTransactionReplyHandler() {
+    return new SemiStructuredObjectTypeReplyHandler();
+  }
+
+}
diff --git a/src/mail/SemiStructuredObjectTypeReplyHandler.php b/src/mail/SemiStructuredObjectTypeReplyHandler.php
new file mode 100644
index 0000000..0473cbe
--- /dev/null
+++ b/src/mail/SemiStructuredObjectTypeReplyHandler.php
@@ -0,0 +1,16 @@
+<?php
+
+final class SemiStructuredObjectTypeReplyHandler
+  extends PhabricatorApplicationTransactionReplyHandler {
+
+  public function validateMailReceiver($mail_receiver) {
+    if (!($mail_receiver instanceof SemiStructuredObjectType)) {
+      throw new Exception(pht('Mail receiver is not a %s!', 'SemiStructuredObjectType'));
+    }
+  }
+
+  public function getObjectPrefix() {
+    return 'SSCL';
+  }
+
+}
diff --git a/src/storage/SemiStructuredObjectType.php b/src/storage/SemiStructuredObjectType.php
index e557c9a..9d92635 100644
--- a/src/storage/SemiStructuredObjectType.php
+++ b/src/storage/SemiStructuredObjectType.php
@@ -1,145 +1,153 @@
 <?php
 
 final class SemiStructuredObjectType extends SemiStructuredDAO
   implements
     PhabricatorPolicyInterface,
     PhabricatorApplicationTransactionInterface,
     // PhabricatorMarkupInterface, ?
-    // PhabricatorSubscribableInterface,
+    PhabricatorSubscribableInterface,
     // PhabricatorConduitResultInterface
     PhabricatorFlaggableInterface,
     PhabricatorDestructibleInterface,
     PhabricatorFerretInterface {
 
 
   protected $viewPolicy;
   protected $editPolicy;
 
   protected $name;
   protected $status;
   protected $description;
 
   protected $customFieldsConfig = array();
 // icon/logo
 
 
 
   const STATUS_ACTIVE = 'active';
   const STATUS_ARCHIVED = 'archived';
 
 
   public static function initializeNewObjectType(PhabricatorUser $actor) {
     return id(new self())
       ->setName('')
       ->setViewPolicy(PhabricatorPolicies::getMostOpenPolicy())
       ->setEditPolicy($actor->getPHID())
       ->setStatus(self::STATUS_ACTIVE);
   }
 
 
   public function getCustomFieldsConfig() {
     if (!$this->customFieldsConfig) {
       return array();
     }
     return $this->customFieldsConfig;
   }
 
   public static function getStatusNameMap() {
     return array(
       self::STATUS_ACTIVE => pht('Active'),
       self::STATUS_ARCHIVED => pht('Archived'),
     );
   }
 
   protected function getConfiguration() {
     return array(
       self::CONFIG_AUX_PHID => true,
       self::CONFIG_SERIALIZATION => array(
         'customFieldsConfig' => self::SERIALIZATION_JSON,
       ),
       self::CONFIG_COLUMN_SCHEMA => array(
         'name' => 'sort255',
         'status' => 'text32',
         'description' => 'text',
       ),
     ) + parent::getConfiguration();
   }
 
   public function getPHIDType() {
     return SemiStructuredObjectTypePHIDType::TYPECONST;
   }
 
   public function isArchived() {
     return ($this->getStatus() == self::STATUS_ARCHIVED);
   }
 
   public function getURI() {
     return urisprintf('/semistruct/type/%d/', $this->getID());
   }
 
   public function getObjectName() {
     return pht('Object Type %d', $this->getID());
   }
 
   public function getIcon() {
     // TODO copy the feature from Projects, where you can put a custom image
     // or select from a list.
     return 'fa-camera';
   }
 
 
 /* -(  PhabricatorApplicationTransactionInterface  )------------------------- */
 
 
   public function getApplicationTransactionEditor() {
     return new SemiStructuredObjectTypeTransactionEditor();
   }
 
   public function getApplicationTransactionTemplate() {
     return new SemiStructuredObjectTypeTransaction();
   }
 
 
 /* -(  PhabricatorPolicyInterface  )----------------------------------------- */
 
 
   public function getCapabilities() {
     return array(
       PhabricatorPolicyCapability::CAN_VIEW,
       PhabricatorPolicyCapability::CAN_EDIT,
       // TODO can-create-instances
     );
   }
 
   public function getPolicy($capability) {
     switch ($capability) {
       case PhabricatorPolicyCapability::CAN_VIEW:
         return $this->getViewPolicy();
       case PhabricatorPolicyCapability::CAN_EDIT:
         return $this->getEditPolicy();
     }
   }
 
   public function hasAutomaticCapability($capability, PhabricatorUser $viewer) {
     return false;
   }
 
 
 /* -(  PhabricatorDestructibleInterface  )----------------------------------- */
 
 
   public function destroyObjectPermanently(
     PhabricatorDestructionEngine $engine) {
 
     $this->openTransaction();
       $this->delete();
     $this->saveTransaction();
   }
 
+
+/* -(  PhabricatorSubscribableInterface  )----------------------------------- */
+
+  public function isAutomaticallySubscribed($phid) {
+    return false;
+  }
+
+
 /* -(  PhabricatorFerretInterface  )----------------------------------------- */
 
   public function newFerretEngine() {
     return new SemiStructuredObjectTypeFerretEngine();
   }
 
 }