diff --git a/resources/sql/20230427.semistructured.1.objecttype.sql b/resources/sql/20230427.semistructured.1.objecttype.sql
new file mode 100644
index 0000000..6e9fbc0
--- /dev/null
+++ b/resources/sql/20230427.semistructured.1.objecttype.sql
@@ -0,0 +1,24 @@
+CREATE TABLE {$NAMESPACE}_semistructured.semistructured_objecttype (
+  id INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
+  phid VARBINARY(64) NOT NULL,
+  dateCreated INT UNSIGNED NOT NULL,
+  dateModified INT UNSIGNED NOT NULL,
+
+  name VARCHAR(255) NOT NULL COLLATE {$COLLATE_SORT},
+  description LONGTEXT NOT NULL COLLATE {$COLLATE_TEXT},
+  status VARCHAR(32) NOT NULL COLLATE {$COLLATE_TEXT},
+
+  UNIQUE KEY `key_phid` (phid)
+) ENGINE=InnoDB, COLLATE {$COLLATE_TEXT};
+
+-- CREATE TABLE {$NAMESPACE}_semistructured.semistructured_objecttypetransaction
+--   LIKE {$NAMESPACE}_file.file_transaction;
+
+CREATE TABLE {$NAMESPACE}_semistructured.semistructured_objecttype_ffield
+  LIKE {$NAMESPACE}_dashboard.dashboard_dashboard_ffield;
+CREATE TABLE {$NAMESPACE}_semistructured.semistructured_objecttype_fdocument
+  LIKE {$NAMESPACE}_dashboard.dashboard_dashboard_fdocument;
+CREATE TABLE {$NAMESPACE}_semistructured.semistructured_objecttype_fngrams
+  LIKE {$NAMESPACE}_dashboard.dashboard_dashboard_fngrams;
+CREATE TABLE {$NAMESPACE}_semistructured.semistructured_objecttype_fngrams_common
+  LIKE {$NAMESPACE}_dashboard.dashboard_dashboard_fngrams_common;
diff --git a/resources/sql/20230427.semistructured.1.objectinstance.sql b/resources/sql/20230427.semistructured.2.objectinstance.sql
similarity index 78%
rename from resources/sql/20230427.semistructured.1.objectinstance.sql
rename to resources/sql/20230427.semistructured.2.objectinstance.sql
index c3ada15..f935943 100644
--- a/resources/sql/20230427.semistructured.1.objectinstance.sql
+++ b/resources/sql/20230427.semistructured.2.objectinstance.sql
@@ -1,16 +1,16 @@
 CREATE TABLE {$NAMESPACE}_semistructured.semistructured_objectinstance (
   id INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
   phid VARBINARY(64) NOT NULL,
   dateCreated INT UNSIGNED NOT NULL,
   dateModified INT UNSIGNED NOT NULL,
 
   classPHID VARBINARY(64) NOT NULL,
   status VARCHAR(32) NOT NULL COLLATE {$COLLATE_TEXT},
   rawData LONGTEXT NOT NULL COLLATE {$COLLATE_TEXT},
 
   UNIQUE KEY `key_phid` (phid),
   KEY `classPHID` (classPHID)
 ) ENGINE=InnoDB, COLLATE {$COLLATE_TEXT};
 
-CREATE TABLE {$NAMESPACE}_semistructured.semistructured_objectinstancetransaction
-  LIKE {$NAMESPACE}_file.file_transaction;
+-- CREATE TABLE {$NAMESPACE}_semistructured.semistructured_objectinstancetransaction
+--   LIKE {$NAMESPACE}_file.file_transaction;
diff --git a/resources/sql/20230427.semistructured.2.objecttype.sql b/resources/sql/20230427.semistructured.2.objecttype.sql
deleted file mode 100644
index 232ec94..0000000
--- a/resources/sql/20230427.semistructured.2.objecttype.sql
+++ /dev/null
@@ -1,15 +0,0 @@
-CREATE TABLE {$NAMESPACE}_semistructured.semistructured_objecttype (
-  id INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
-  phid VARBINARY(64) NOT NULL,
-  dateCreated INT UNSIGNED NOT NULL,
-  dateModified INT UNSIGNED NOT NULL,
-
-  name VARCHAR(255) NOT NULL COLLATE {$COLLATE_SORT},
-  description LONGTEXT NOT NULL COLLATE {$COLLATE_TEXT},
-  status VARCHAR(32) NOT NULL COLLATE {$COLLATE_TEXT},
-
-  UNIQUE KEY `key_phid` (phid)
-) ENGINE=InnoDB, COLLATE {$COLLATE_TEXT};
-
-CREATE TABLE {$NAMESPACE}_semistructured.semistructured_objecttypetransaction
-  LIKE {$NAMESPACE}_file.file_transaction;
diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
index 0baa48d..872b200 100644
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -1,44 +1,55 @@
 <?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',
     'SemiStructuredObjectInstance' => 'applications/semistruct/storage/SemiStructuredObjectInstance.php',
     'SemiStructuredObjectInstancePHIDType' => 'applications/semistruct/phid/SemiStructuredObjectInstancePHIDType.php',
+    'SemiStructuredObjectInstanceQuery' => 'applications/semistruct/query/SemiStructuredObjectInstanceQuery.php',
     'SemiStructuredObjectType' => 'applications/semistruct/storage/SemiStructuredObjectType.php',
+    'SemiStructuredObjectTypeFerretEngine' => 'applications/semistruct/engine/SemiStructuredObjectTypeFerretEngine.php',
+    'SemiStructuredObjectTypeListController' => 'applications/semistruct/controller/SemiStructuredObjectTypeListController.php',
     'SemiStructuredObjectTypePHIDType' => 'applications/semistruct/phid/SemiStructuredObjectTypePHIDType.php',
+    'SemiStructuredObjectTypeQuery' => 'applications/semistruct/query/SemiStructuredObjectTypeQuery.php',
+    'SemiStructuredObjectTypeSearchEngine' => 'applications/semistruct/query/SemiStructuredObjectTypeSearchEngine.php',
     'SemiStructuredPatchList' => 'applications/semistruct/storage/SemiStructuredPatchList.php',
   ),
   'function' => array(),
   'xmap' => array(
     'SemiStructuredBaseController' => 'PhabricatorController',
     'SemiStructuredDAO' => 'PhabricatorLiskDAO',
     'SemiStructuredDataApplication' => 'PhabricatorApplication',
     'SemiStructuredObjectInstance' => array(
       'SemiStructuredDAO',
       'PhabricatorPolicyInterface',
       'PhabricatorApplicationTransactionInterface',
       'PhabricatorFlaggableInterface',
       'PhabricatorDestructibleInterface',
     ),
     'SemiStructuredObjectInstancePHIDType' => 'PhabricatorPHIDType',
+    'SemiStructuredObjectInstanceQuery' => 'PhabricatorCursorPagedPolicyAwareQuery',
     'SemiStructuredObjectType' => array(
       'SemiStructuredDAO',
       'PhabricatorPolicyInterface',
       'PhabricatorApplicationTransactionInterface',
       'PhabricatorFlaggableInterface',
       'PhabricatorDestructibleInterface',
+      'PhabricatorFerretInterface',
     ),
+    'SemiStructuredObjectTypeFerretEngine' => 'PhabricatorFerretEngine',
+    'SemiStructuredObjectTypeListController' => 'SemiStructuredBaseController',
     'SemiStructuredObjectTypePHIDType' => 'PhabricatorPHIDType',
+    'SemiStructuredObjectTypeQuery' => 'PhabricatorCursorPagedPolicyAwareQuery',
+    'SemiStructuredObjectTypeSearchEngine' => 'PhabricatorApplicationSearchEngine',
     'SemiStructuredPatchList' => 'PhabricatorSQLPatchList',
   ),
 ));
diff --git a/src/application/SemiStructuredDataApplication.php b/src/application/SemiStructuredDataApplication.php
index 873b6b1..4c0022f 100644
--- a/src/application/SemiStructuredDataApplication.php
+++ b/src/application/SemiStructuredDataApplication.php
@@ -1,23 +1,25 @@
 <?php
 
 final class SemiStructuredDataApplication extends PhabricatorApplication {
   public function getName() {
     return pht('Semi-Structured');
   }
 
   public function getShortDescription() {
-    return 'TBD';
+    return pht('Work with evolving data sets.');
   }
 
   public function getBaseURI() {
     return '/semistruct/';
   }
 
   public function getRoutes() {
     return array(
         '/semistruct/' => array(
+          '(?:query/(?P<queryKey>[^/]+)/)?' =>
+            'SemiStructuredObjectTypeListController',
       ),
     );
   }
 
 }
diff --git a/src/controller/SemiStructuredBaseController.php b/src/controller/SemiStructuredBaseController.php
index 4ad8018..ab83928 100644
--- a/src/controller/SemiStructuredBaseController.php
+++ b/src/controller/SemiStructuredBaseController.php
@@ -1,11 +1,16 @@
 <?php
 
 abstract class SemiStructuredBaseController extends PhabricatorController {
 
   public function buildApplicationMenu() {
     return $this->newApplicationMenu()
       // ->setSearchEngine(new PhabricatorBadgesSearchEngine());
       ;
   }
 
+  public function shouldAllowPublic() {
+    return true;
+  }
+
+
 }
diff --git a/src/controller/SemiStructuredObjectTypeListController.php b/src/controller/SemiStructuredObjectTypeListController.php
new file mode 100644
index 0000000..f9d30fa
--- /dev/null
+++ b/src/controller/SemiStructuredObjectTypeListController.php
@@ -0,0 +1,41 @@
+<?php
+
+final class SemiStructuredObjectTypeListController
+  extends SemiStructuredBaseController {
+
+  public function handleRequest(AphrontRequest $request) {
+    $viewer = $request->getViewer();
+    $query_key = $request->getURIData('queryKey');
+
+    $controller = id(new PhabricatorApplicationSearchController())
+      ->setQueryKey($query_key)
+      ->setSearchEngine(new SemiStructuredObjectTypeSearchEngine())
+      ->setNavigation($this->buildSideNavView());
+    return $this->delegateToController($controller);
+  }
+
+  public function buildSideNavView() {
+    $user = $this->getRequest()->getUser();
+
+    $nav = new AphrontSideNavFilterView();
+    $nav->setBaseURI(new PhutilURI($this->getApplicationURI()));
+
+    id(new SemiStructuredObjectTypeSearchEngine())
+      ->setViewer($user)
+      ->addNavigationItems($nav->getMenu());
+
+    $nav->selectFilter(null);
+
+    return $nav;
+  }
+
+  protected function buildApplicationCrumbs() {
+    $crumbs = parent::buildApplicationCrumbs();
+
+//    id(new SemiStructuredObjectTypeEditEngine()) // TODO
+  //    ->setViewer($this->getViewer())
+    //  ->addActionToCrumbs($crumbs);
+
+    return $crumbs;
+  }
+}
diff --git a/src/engine/SemiStructuredObjectTypeFerretEngine.php b/src/engine/SemiStructuredObjectTypeFerretEngine.php
new file mode 100644
index 0000000..20510df
--- /dev/null
+++ b/src/engine/SemiStructuredObjectTypeFerretEngine.php
@@ -0,0 +1,18 @@
+<?php
+
+final class SemiStructuredObjectTypeFerretEngine
+  extends PhabricatorFerretEngine {
+
+  public function getApplicationName() {
+    return 'semistructured';
+  }
+
+  public function getScopeName() {
+    return 'objecttype';
+  }
+
+  public function newSearchEngine() {
+    return new SemiStructuredObjectTypeSearchEngine();
+  }
+
+}
diff --git a/src/query/SemiStructuredObjectInstanceQuery.php b/src/query/SemiStructuredObjectInstanceQuery.php
new file mode 100644
index 0000000..233322e
--- /dev/null
+++ b/src/query/SemiStructuredObjectInstanceQuery.php
@@ -0,0 +1,100 @@
+<?php
+
+final class SemiStructuredObjectInstanceQuery
+  extends PhabricatorCursorPagedPolicyAwareQuery {
+
+  private $ids;
+  private $phids;
+  private $classPHIDs;
+  private $statuses;
+  private $canEdit;
+
+  public function withIDs(array $ids) {
+    $this->ids = $ids;
+    return $this;
+  }
+
+  public function withPHIDs(array $phids) {
+    $this->phids = $phids;
+    return $this;
+  }
+
+  public function withClassPHIDs(array $classPHIDs) {
+    $this->classPHIDs = $classPHIDs;
+    return $this;
+  }
+
+  public function withStatuses(array $statuses) {
+    $this->statuses = $statuses;
+    return $this;
+  }
+
+
+  public function withCanEdit($can_edit) {
+    $this->canEdit = $can_edit;
+    return $this;
+  }
+
+  public function newResultObject() {
+    return new SemiStructuredObjectInstance();
+  }
+
+  protected function didFilterPage(array $items) {
+
+    $phids = mpull($items, 'getPHID');
+
+    if ($this->canEdit) {
+      $items = id(new PhabricatorPolicyFilter())
+        ->setViewer($this->getViewer())
+        ->requireCapabilities(array(
+          PhabricatorPolicyCapability::CAN_EDIT,
+        ))
+        ->apply($items);
+    }
+
+    return $items;
+  }
+
+  protected function buildWhereClauseParts(AphrontDatabaseConnection $conn) {
+    $where = parent::buildWhereClauseParts($conn);
+
+    if ($this->ids !== null) {
+      $where[] = qsprintf(
+        $conn,
+        'instances.id IN (%Ld)',
+        $this->ids);
+    }
+
+    if ($this->phids !== null) {
+      $where[] = qsprintf(
+        $conn,
+        'instances.phid IN (%Ls)',
+        $this->phids);
+    }
+
+    if ($this->classPHIDs !== null) {
+      $where[] = qsprintf(
+        $conn,
+        'instances.classPHID IN (%Ls)',
+        $this->phids);
+    }
+
+    if ($this->statuses !== null) {
+      $where[] = qsprintf(
+        $conn,
+        'instances.status IN (%Ls)',
+        $this->statuses);
+    }
+
+    return $where;
+  }
+
+  public function getQueryApplicationClass() {
+    return 'SemiStructuredDataApplication';
+  }
+
+  protected function getPrimaryTableAlias() {
+    return 'instances';
+  }
+
+}
diff --git a/src/query/SemiStructuredObjectTypeQuery.php b/src/query/SemiStructuredObjectTypeQuery.php
new file mode 100644
index 0000000..4fade63
--- /dev/null
+++ b/src/query/SemiStructuredObjectTypeQuery.php
@@ -0,0 +1,87 @@
+<?php
+
+final class SemiStructuredObjectTypeQuery
+  extends PhabricatorCursorPagedPolicyAwareQuery {
+
+  private $ids;
+  private $phids;
+  private $statuses;
+  private $canEdit;
+
+  public function withIDs(array $ids) {
+    $this->ids = $ids;
+    return $this;
+  }
+
+  public function withPHIDs(array $phids) {
+    $this->phids = $phids;
+    return $this;
+  }
+
+  public function withStatuses(array $statuses) {
+    $this->statuses = $statuses;
+    return $this;
+  }
+
+
+  public function withCanEdit($can_edit) {
+    $this->canEdit = $can_edit;
+    return $this;
+  }
+
+  public function newResultObject() {
+    return new SemiStructuredObjectType();
+  }
+
+  protected function didFilterPage(array $items) {
+
+    $phids = mpull($items, 'getPHID');
+
+    if ($this->canEdit) {
+      $items = id(new PhabricatorPolicyFilter())
+        ->setViewer($this->getViewer())
+        ->requireCapabilities(array(
+          PhabricatorPolicyCapability::CAN_EDIT,
+        ))
+        ->apply($items);
+    }
+
+    return $items;
+  }
+
+  protected function buildWhereClauseParts(AphrontDatabaseConnection $conn) {
+    $where = parent::buildWhereClauseParts($conn);
+
+    if ($this->ids !== null) {
+      $where[] = qsprintf(
+        $conn,
+        'classes.id IN (%Ld)',
+        $this->ids);
+    }
+
+    if ($this->phids !== null) {
+      $where[] = qsprintf(
+        $conn,
+        'classes.phid IN (%Ls)',
+        $this->phids);
+    }
+
+    if ($this->statuses !== null) {
+      $where[] = qsprintf(
+        $conn,
+        'classes.status IN (%Ls)',
+        $this->statuses);
+    }
+
+    return $where;
+  }
+
+  public function getQueryApplicationClass() {
+    return 'SemiStructuredDataApplication';
+  }
+
+  protected function getPrimaryTableAlias() {
+    return 'classes';
+  }
+
+}
diff --git a/src/query/SemiStructuredObjectTypeSearchEngine.php b/src/query/SemiStructuredObjectTypeSearchEngine.php
new file mode 100644
index 0000000..82b09a9
--- /dev/null
+++ b/src/query/SemiStructuredObjectTypeSearchEngine.php
@@ -0,0 +1,153 @@
+<?php
+
+final class SemiStructuredObjectTypeSearchEngine
+  extends PhabricatorApplicationSearchEngine {
+
+  public function getResultTypeDescription() {
+    return pht('Object Types');
+  }
+
+  public function getApplicationClassName() {
+    return 'SemiStructuredDataApplication';
+  }
+
+  public function newQuery() {
+    return id(new SemiStructuredObjectTypeQuery());
+  }
+
+  protected function buildCustomSearchFields() {
+    return array(
+      id(new PhabricatorSearchCheckboxesField())
+        ->setKey('statuses')
+        ->setLabel(pht('Status'))
+        ->setOptions(PhabricatorDashboard::getStatusNameMap()),
+      id(new PhabricatorSearchCheckboxesField())
+        ->setKey('editable')
+        ->setLabel(pht('Editable'))
+        ->setOptions(array('editable' => null)),
+    );
+  }
+
+  protected function getURI($path) {
+    return '/semistruct/'.$path;
+  }
+
+  protected function getBuiltinQueryNames() {
+    $names = array();
+
+    $names['all'] = pht('All Types');
+    $names['open'] = pht('Active Types');
+
+    return $names;
+  }
+
+  public function buildSavedQueryFromBuiltin($query_key) {
+    $query = $this->newSavedQuery();
+    $query->setQueryKey($query_key);
+    $viewer = $this->requireViewer();
+
+    switch ($query_key) {
+      case 'all':
+        return $query;
+      case 'open':
+        return $query->setParameter(
+          'statuses',
+          array(
+            SemiStructuredObjectType::STATUS_ACTIVE,
+          ));
+    }
+
+    return parent::buildSavedQueryFromBuiltin($query_key);
+  }
+
+
+  protected function buildQueryFromParameters(array $map) {
+    $query = $this->newQuery();
+
+    if ($map['statuses']) {
+      $query->withStatuses($map['statuses']);
+    }
+
+    if ($map['editable'] !== null) {
+      $query->withCanEdit($map['editable']);
+    }
+
+    return $query;
+  }
+
+  protected function renderResultList(
+    array $items,
+    PhabricatorSavedQuery $query,
+    array $handles) {
+
+    $viewer = $this->requireViewer();
+
+    $phids = array();
+    foreach ($items as $item) {
+      // $author_phid = $dashboard->getAuthorPHID();
+      // if ($author_phid) {
+      //   $phids[] = $author_phid;
+      // }
+    }
+
+    $handles = $viewer->loadHandles($phids);
+
+    if ($items) {
+      $edge_query = id(new PhabricatorEdgeQuery())
+        ->withSourcePHIDs(mpull($items, 'getPHID'))
+        ->withEdgeTypes(
+          array(
+            PhabricatorProjectObjectHasProjectEdgeType::EDGECONST,
+          ));
+
+      $edge_query->execute();
+    }
+
+    $list = id(new PHUIObjectItemListView())
+      ->setViewer($viewer);
+
+    foreach ($items as $item) {
+      $item = id(new PHUIObjectItemView())
+        ->setViewer($viewer)
+        ->setObjectName($item->getObjectName())
+        ->setHeader($item->getName())
+        ->setHref($item->getURI())
+        ->setObject($item);
+
+      if ($item->isArchived()) {
+        $item->setDisabled(true);
+        $bg_color = 'bg-grey';
+      } else {
+        $bg_color = 'bg-dark';
+      }
+
+      $icon = id(new PHUIIconView())
+        ->setIcon($item->getIcon())
+        ->setBackground($bg_color);
+      $item->setImageIcon($icon);
+      $item->setEpoch($item->getDateModified());
+
+
+      $phid = $item->getPHID();
+      $project_phids = $edge_query->getDestinationPHIDs(array($phid));
+      $project_handles = $viewer->loadHandles($project_phids);
+
+      $item->addAttribute(
+        id(new PHUIHandleTagListView())
+          ->setLimit(4)
+          ->setNoDataString(pht('No Tags'))
+          ->setSlim(true)
+          ->setHandles($project_handles));
+
+      $list->addItem($item);
+    }
+
+    $result = new PhabricatorApplicationSearchResultView();
+    $result->setObjectList($list);
+    $result->setNoDataString(pht('No object types found.'));
+
+    return $result;
+  }
+
+
+}
diff --git a/src/storage/SemiStructuredObjectType.php b/src/storage/SemiStructuredObjectType.php
index 356e0ba..fcf849d 100644
--- a/src/storage/SemiStructuredObjectType.php
+++ b/src/storage/SemiStructuredObjectType.php
@@ -1,99 +1,106 @@
 <?php
 
 final class SemiStructuredObjectType extends SemiStructuredDAO
   implements
     PhabricatorPolicyInterface,
     PhabricatorApplicationTransactionInterface,
     // PhabricatorSubscribableInterface,
     PhabricatorFlaggableInterface,
-    PhabricatorDestructibleInterface
+    PhabricatorDestructibleInterface,
+    PhabricatorFerretInterface
     // PhabricatorConduitResultInterface
      {
 
 
   protected $name;
   protected $status;
   protected $description;
 
 
 
   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())  // TODO config for deflt
       ->setStatus(self::STATUS_ACTIVE);
   }
 
   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_COLUMN_SCHEMA => array(
         'name' => 'sort255',
         'status' => 'text32',
         'description' => 'text',
       ),
     ) + parent::getConfiguration();
   }
 
 
 
 /* -(  PhabricatorApplicationTransactionInterface  )------------------------- */
 
 
   public function getApplicationTransactionEditor() {
     return new PhabricatorDashboardPanelTransactionEditor();
   }
 
   public function getApplicationTransactionTemplate() {
     return new PhabricatorDashboardPanelTransaction();
   }
 
 
 /* -(  PhabricatorPolicyInterface  )----------------------------------------- */
 
 
   public function getCapabilities() {
     return array(
       PhabricatorPolicyCapability::CAN_VIEW,
       PhabricatorPolicyCapability::CAN_EDIT,
     );
   }
 
   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();
   }
 
+/* -(  PhabricatorFerretInterface  )----------------------------------------- */
+
+  public function newFerretEngine() {
+    return new SemiStructuredObjectTypeFerretEngine();
+  }
+
 }