diff --git a/Description/Descriptor.php b/Description/Descriptor.php
index 9b0e2b1..28955ee 100644
--- a/Description/Descriptor.php
+++ b/Description/Descriptor.php
@@ -19,21 +19,25 @@ final class Descriptor
 {
     /**
      * Alias for the resource type for example `app.page`.
+     * Value should be a scalar string.
      */
     const TYPE_ALIAS = 'type.alias';
 
     /**
      * Humanized representation of the resource type.
+     * Value should be a scalar string.
      */
     const TYPE_TITLE = 'type.title';
 
     /**
      * Title of the actual payload, e.g. "My Blog Post".
+     * Value should be a scalar string.
      */
     const PAYLOAD_TITLE = 'title';
 
     /**
      * Descriptors for HTML links.
+     * Values should be either a valid URI.
      */
     const LINK_EDIT_HTML = 'link.edit.html';
     const LINK_CREATE_HTML = 'link.create.html';
@@ -44,6 +48,7 @@ final class Descriptor
 
     /**
      * Descriptors for REST links.
+     * Values should be either a valid URI.
      */
     const LINK_EDIT_REST = 'link.edit.rest';
     const LINK_CREATE_REST = 'link.create.rest';
@@ -54,8 +59,16 @@ final class Descriptor
 
     /**
      * Permitted children types for this resource.
-     * Value is an array.
+     * Value should be a scalar array, e.g. [ `stdClass`, `FooClass` ]
+     *
+     * NOTE: This should be an explicit list of types and should not include
+     *       interfaces are abstract class names.
      */
     const CHILDREN_TYPES = 'children.types';
+
+    /**
+     * If children are allowed to be added to this resource.
+     * Value should be a boolean.
+     */
     const CHILDREN_ALLOW = 'children.allow';
 }
diff --git a/Description/Enhancer/Doctrine/PhpcrOdm/PhpcrOdmEnhancer.php b/Description/Enhancer/Doctrine/PhpcrOdm/PhpcrOdmEnhancer.php
index ece297b..6e2ed94 100644
--- a/Description/Enhancer/Doctrine/PhpcrOdm/PhpcrOdmEnhancer.php
+++ b/Description/Enhancer/Doctrine/PhpcrOdm/PhpcrOdmEnhancer.php
@@ -39,9 +39,20 @@ public function __construct(ClassMetadataFactory $metadataFactory)
     public function enhance(Description $description)
     {
         $metadata = $this->metadataFactory->getMetadataFor($description->getResource()->getPayloadType());
+        $childClasses = $metadata->getChildClasses();
+        $childTypes = [];
+
+        // explode the allowed types into concrete classes
+        foreach ($this->metadataFactory->getAllMetadata() as $childMetadata) {
+            foreach ($childClasses as $childClass) {
+                if ($childClass == $childMetadata->name || $childMetadata->getReflectionClass()->isSubclassOf($childClass)) {
+                    $childTypes[] = $childMetadata->name;
+                }
+            }
+        }
 
         $description->set(Descriptor::CHILDREN_ALLOW, !$metadata->isLeaf());
-        $description->set(Descriptor::CHILDREN_TYPES, $metadata->getChildClasses());
+        $description->set(Descriptor::CHILDREN_TYPES, $childTypes);
     }
 
     /**
diff --git a/Tests/Unit/Description/Enhancer/Doctrine/PhpcrOdm/PhpcrOdmEnhancerTest.php b/Tests/Unit/Description/Enhancer/Doctrine/PhpcrOdm/PhpcrOdmEnhancerTest.php
index a230f21..a3c5793 100644
--- a/Tests/Unit/Description/Enhancer/Doctrine/PhpcrOdm/PhpcrOdmEnhancerTest.php
+++ b/Tests/Unit/Description/Enhancer/Doctrine/PhpcrOdm/PhpcrOdmEnhancerTest.php
@@ -18,6 +18,7 @@
 use Symfony\Cmf\Component\Resource\Description\Enhancer\Doctrine\PhpcrOdm\PhpcrOdmEnhancer;
 use Puli\Repository\Api\Resource\PuliResource;
 use Doctrine\ODM\PHPCR\Mapping\ClassMetadata;
+use Symfony\Cmf\Component\Resource\Repository\Resource\PhpcrResource;
 
 class PhpcrOdmEnhancerTest extends \PHPUnit_Framework_TestCAse
 {
@@ -77,20 +78,65 @@ public function testNotSupportsNotSupportedByPhpcrOdm()
      */
     public function testEnhanceDescription()
     {
+        // object the implements an allowed interface
+        $mappedObject1 = $this->prophesize();
+        $mappedObject1->willImplement(FooInterface::class);
+        $metadata1 = $this->prophesize(ClassMetadata::class);
+        $metadata1->name = get_class($mappedObject1->reveal());
+        $metadata1->getReflectionClass()->willReturn(new \ReflectionClass($metadata1->name));
+
+        // object the extends an allowed class
+        $mappedObject2 = $this->prophesize();
+        $mappedObject2->willExtend(AbstractFoo::class);
+        $metadata2 = $this->prophesize(ClassMetadata::class);
+        $metadata2->name = get_class($mappedObject2->reveal());
+        $metadata2->getReflectionClass()->willReturn(new \ReflectionClass($metadata2->name));
+
+        // object of exact type that is allowed
+        $mappedObject3 = $this->prophesize();
+        $metadata3 = $this->prophesize(ClassMetadata::class);
+        $metadata3->name = get_class($mappedObject3->reveal());
+        $metadata3->getReflectionClass()->willReturn(new \ReflectionClass($metadata3->reveal()));
+
+        // object that is not permitted
+        $metadata4 = $this->prophesize(ClassMetadata::class);
+        $metadata4->name = NotAllowedFoo::class;
+        $metadata4->getReflectionClass()->willReturn(new \ReflectionClass($metadata4->reveal()));
+
         $this->description->getResource()->willReturn($this->cmfResource->reveal());
         $this->cmfResource->getPayloadType()->willReturn('payload_type');
         $this->metadataFactory->getMetadataFor('payload_type')->willReturn($this->odmMetadata->reveal());
+        $this->metadataFactory->getAllMetadata()->willReturn([
+            $metadata1->reveal(),
+            $metadata2->reveal(),
+            $metadata3->reveal(),
+        ]);
+
         $this->odmMetadata->isLeaf()->willReturn(false);
         $this->odmMetadata->getChildClasses()->willReturn([
-            'class_1',
-            'class_2',
+            FooInterface::class,
+            AbstractFoo::class,
+            $metadata3->name,
         ]);
 
         $this->description->set(Descriptor::CHILDREN_ALLOW, true)->shouldBeCalled();
         $this->description->set(Descriptor::CHILDREN_TYPES, [
-            'class_1',
-            'class_2',
+            $metadata1->name,
+            $metadata2->name,
+            $metadata3->name,
         ])->shouldBeCalled();
         $this->enhancer->enhance($this->description->reveal());
     }
 }
+
+interface FooInterface
+{
+}
+
+class AbstractFoo
+{
+}
+
+class NotAllowedFoo
+{
+}
diff --git a/composer.json b/composer.json
index e330b34..26bb0af 100644
--- a/composer.json
+++ b/composer.json
@@ -18,10 +18,10 @@
     },
     "require-dev": {
         "phpspec/prophecy-phpunit": "~1.0.0",
-        "doctrine/phpcr-odm": "~1.2",
         "jackalope/jackalope-fs": "dev-master",
         "sonata-project/admin-bundle": "^3.1",
-        "sylius/resource-bundle": "0.18"
+        "sylius/resource-bundle": "0.18",
+        "doctrine/phpcr-odm": "^1.4"
     },
     "suggest": {
         "doctrine/phpcr-odm": "To enable support for the PHPCR ODM documents",