diff --git a/resources/sql/20230427.semistructured.1.objectinstance.sql b/resources/sql/20230427.semistructured.1.objectinstance.sql
new file mode 100644
index 0000000..c3ada15
--- /dev/null
+++ b/resources/sql/20230427.semistructured.1.objectinstance.sql
@@ -0,0 +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;
diff --git a/resources/sql/20230427.semistructured.2.objecttype.sql b/resources/sql/20230427.semistructured.2.objecttype.sql
new file mode 100644
index 0000000..232ec94
--- /dev/null
+++ b/resources/sql/20230427.semistructured.2.objecttype.sql
@@ -0,0 +1,15 @@
+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 cb669a2..0baa48d 100644
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -1,18 +1,44 @@
 <?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',
+    'SemiStructuredObjectType' => 'applications/semistruct/storage/SemiStructuredObjectType.php',
+    'SemiStructuredObjectTypePHIDType' => 'applications/semistruct/phid/SemiStructuredObjectTypePHIDType.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',
+    'SemiStructuredObjectType' => array(
+      'SemiStructuredDAO',
+      'PhabricatorPolicyInterface',
+      'PhabricatorApplicationTransactionInterface',
+      'PhabricatorFlaggableInterface',
+      'PhabricatorDestructibleInterface',
+    ),
+    'SemiStructuredObjectTypePHIDType' => 'PhabricatorPHIDType',
+    'SemiStructuredPatchList' => 'PhabricatorSQLPatchList',
   ),
 ));
diff --git a/src/application/SemiStructuredDataApplication.php b/src/application/SemiStructuredDataApplication.php
index 8e14cbf..873b6b1 100644
--- a/src/application/SemiStructuredDataApplication.php
+++ b/src/application/SemiStructuredDataApplication.php
@@ -1,23 +1,23 @@
 <?php
 
 final class SemiStructuredDataApplication extends PhabricatorApplication {
   public function getName() {
-    return 'Semi-Structured';
+    return pht('Semi-Structured');
   }
 
   public function getShortDescription() {
-    return "TBD";
+    return 'TBD';
   }
 
   public function getBaseURI() {
     return '/semistruct/';
   }
 
   public function getRoutes() {
     return array(
         '/semistruct/' => array(
       ),
     );
   }
 
 }
diff --git a/src/controller/SemiStructuredBaseController.php b/src/controller/SemiStructuredBaseController.php
new file mode 100644
index 0000000..4ad8018
--- /dev/null
+++ b/src/controller/SemiStructuredBaseController.php
@@ -0,0 +1,11 @@
+<?php
+
+abstract class SemiStructuredBaseController extends PhabricatorController {
+
+  public function buildApplicationMenu() {
+    return $this->newApplicationMenu()
+      // ->setSearchEngine(new PhabricatorBadgesSearchEngine());
+      ;
+  }
+
+}
diff --git a/src/phid/SemiStructuredObjectInstancePHIDType.php b/src/phid/SemiStructuredObjectInstancePHIDType.php
new file mode 100644
index 0000000..2ed055c
--- /dev/null
+++ b/src/phid/SemiStructuredObjectInstancePHIDType.php
@@ -0,0 +1,42 @@
+<?php
+
+final class SemiStructuredObjectInstancePHIDType extends PhabricatorPHIDType {
+
+  const TYPECONST = 'SSIN';
+
+  public function getTypeName() {
+    return pht('Object Instance');
+  }
+
+  public function newObject() {
+    return new SemiStructuredObjectInstance();
+  }
+
+  public function getPHIDTypeApplicationClass() {
+    return 'SemiStructuredDataApplication';
+  }
+
+  protected function buildQueryForObjects(
+    PhabricatorObjectQuery $query,
+    array $phids) {
+
+    return id(new SemiStructuredObjectInstanceQuery())
+      ->withPHIDs($phids);
+  }
+
+  public function loadHandles(
+    PhabricatorHandleQuery $query,
+    array $handles,
+    array $objects) {
+
+    foreach ($handles as $phid => $handle) {
+      $item = $objects[$phid];
+
+      $id = $item->getID();
+
+      $handle->setName($item->getName());
+      // TODO $handle->setURI("/semistruct/object/view/{$id}/");
+    }
+  }
+
+}
diff --git a/src/phid/SemiStructuredObjectTypePHIDType.php b/src/phid/SemiStructuredObjectTypePHIDType.php
new file mode 100644
index 0000000..2de90bf
--- /dev/null
+++ b/src/phid/SemiStructuredObjectTypePHIDType.php
@@ -0,0 +1,42 @@
+<?php
+
+final class SemiStructuredObjectTypePHIDType extends PhabricatorPHIDType {
+
+  const TYPECONST = 'SSCL';
+
+  public function getTypeName() {
+    return pht('Object Type');
+  }
+
+  public function newObject() {
+    return new SemiStructuredObjectType();
+  }
+
+  public function getPHIDTypeApplicationClass() {
+    return 'SemiStructuredDataApplication';
+  }
+
+  protected function buildQueryForObjects(
+    PhabricatorObjectQuery $query,
+    array $phids) {
+
+    return id(new SemiStructuredObjectTypeQuery())
+      ->withPHIDs($phids);
+  }
+
+  public function loadHandles(
+    PhabricatorHandleQuery $query,
+    array $handles,
+    array $objects) {
+
+    foreach ($handles as $phid => $handle) {
+      $item = $objects[$phid];
+
+      $id = $item->getID();
+
+      $handle->setName($item->getName());
+      $handle->setURI("/semistruct/types/view/{$id}/");
+    }
+  }
+
+}
diff --git a/src/storage/SemiStructuredDAO.php b/src/storage/SemiStructuredDAO.php
new file mode 100644
index 0000000..38c4bd2
--- /dev/null
+++ b/src/storage/SemiStructuredDAO.php
@@ -0,0 +1,9 @@
+<?php
+
+abstract class SemiStructuredDAO extends PhabricatorLiskDAO {
+
+  public function getApplicationName() {
+    return 'semistructured';
+  }
+
+}
diff --git a/src/storage/SemiStructuredObjectInstance.php b/src/storage/SemiStructuredObjectInstance.php
new file mode 100644
index 0000000..c8dc301
--- /dev/null
+++ b/src/storage/SemiStructuredObjectInstance.php
@@ -0,0 +1,107 @@
+<?php
+
+final class SemiStructuredObjectInstance extends SemiStructuredDAO
+  implements
+    PhabricatorPolicyInterface,
+    PhabricatorApplicationTransactionInterface,
+    // PhabricatorSubscribableInterface,
+    PhabricatorFlaggableInterface,
+    PhabricatorDestructibleInterface
+    // PhabricatorConduitResultInterface
+    {
+
+
+  protected $classPHID;
+  protected $status;
+  protected $rawData;
+
+
+
+  const STATUS_ACTIVE = 'active';
+  const STATUS_ARCHIVED = 'archived';
+
+
+  public static function initializeNewObjectInstance(
+      PhabricatorUser $actor,
+      SemiStructuredObjectType $object_class) {
+
+    return id(new self())
+      ->setClassPHID($object_class->getPHID())
+      ->setViewPolicy(PhabricatorPolicies::getMostOpenPolicy()) // TODO take policies from class?
+      ->setEditPolicy($actor->getPHID())
+      ->setStatus(self::STATUS_ACTIVE);
+  }
+
+  public static function getStatusNameMap() {
+    return array(
+      self::STATUS_ACTIVE => pht('Active'),
+      self::STATUS_ARCHIVED => pht('Archived'),
+    );
+  }
+
+  protected function getConfiguration() {
+    return array(
+      self::CONFIG_AUX_PHID => true,
+      self::CONFIG_COLUMN_SCHEMA => array(
+        'name' => 'sort255',
+        'status' => 'text32',
+        'classPHID' => 'phid',
+        'rawData' => 'text',
+      ),
+      self::CONFIG_KEY_SCHEMA => array(
+        'classPHID' => array(
+          'columns' => array('classPHID'),
+        ),
+      ),
+    ) + parent::getConfiguration();
+  }
+
+
+/* -(  PhabricatorApplicationTransactionInterface  )------------------------- */
+
+
+  public function getApplicationTransactionEditor() {
+    return new PhabricatorDashboardPanelTransactionEditor();
+  }
+
+  public function getApplicationTransactionTemplate() {
+    return new PhabricatorDashboardPanelTransaction();
+  }
+
+
+/* -(  PhabricatorPolicyInterface  )----------------------------------------- */
+
+
+  public function getCapabilities() {
+    return array(
+      PhabricatorPolicyCapability::CAN_VIEW,
+      PhabricatorPolicyCapability::CAN_EDIT,
+    );
+  }
+
+  public function getPolicy($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();
+  }
+
+}
diff --git a/src/storage/SemiStructuredObjectType.php b/src/storage/SemiStructuredObjectType.php
new file mode 100644
index 0000000..356e0ba
--- /dev/null
+++ b/src/storage/SemiStructuredObjectType.php
@@ -0,0 +1,99 @@
+<?php
+
+final class SemiStructuredObjectType extends SemiStructuredDAO
+  implements
+    PhabricatorPolicyInterface,
+    PhabricatorApplicationTransactionInterface,
+    // PhabricatorSubscribableInterface,
+    PhabricatorFlaggableInterface,
+    PhabricatorDestructibleInterface
+    // 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();
+  }
+
+}
diff --git a/src/storage/SemiStructuredPatchList.php b/src/storage/SemiStructuredPatchList.php
new file mode 100644
index 0000000..a993662
--- /dev/null
+++ b/src/storage/SemiStructuredPatchList.php
@@ -0,0 +1,27 @@
+<?php
+
+final class SemiStructuredPatchList extends PhabricatorSQLPatchList {
+
+  public function getNamespace() {
+    return 'semistructured';
+  }
+
+  public function getPatches() {
+    $root = dirname(phutil_get_library_root('semi-structured'));
+
+    $db_patches = array(
+      // First one is special.
+      'db.semistructured' => array(
+        'name' => 'semistructured',
+        'type' => 'db',
+        'after' => array(),
+      ),
+    );
+
+
+    $auto = $this->buildPatchesFromDirectory($root.'/resources/sql/');
+
+    return $db_patches + $auto;
+  }
+
+}