diff --git a/core/modules/rdf/lib/Drupal/rdf/Tests/Field/FieldRdfaDatatypeCallbackTest.php b/core/modules/rdf/lib/Drupal/rdf/Tests/Field/FieldRdfaDatatypeCallbackTest.php
index fb51ea7..a7f6ebb 100644
--- a/core/modules/rdf/lib/Drupal/rdf/Tests/Field/FieldRdfaDatatypeCallbackTest.php
+++ b/core/modules/rdf/lib/Drupal/rdf/Tests/Field/FieldRdfaDatatypeCallbackTest.php
@@ -37,17 +37,14 @@ public function setUp() {
     $mapping->setFieldMapping($this->fieldName, array(
       'properties' => array('schema:interactionCount'),
       'datatype_callback' => array(
-        'callable' => 'Drupal\rdf\SchemaOrgDataConverter::interactionCount',
-        'arguments' => array(
-          'interaction_type' => 'UserComments',
-        ),
+        'callable' => 'Drupal\rdf\Tests\Field\TestDataConverter::convertFoo',
       ),
     ))->save();
 
     // Set up test values.
-    $this->number_test = '5';
+    $this->test_value = $this->randomName();
     $this->entity = entity_create('entity_test_render', array());
-    $this->entity->{$this->fieldName}->value = $this->number_test;
+    $this->entity->{$this->fieldName}->value = $this->test_value;
     $this->entity->save();
 
     $this->uri = $this->getAbsoluteUri($this->entity);
@@ -58,7 +55,7 @@ public function setUp() {
    */
   public function testDefaultFormatter() {
     // Expected value is the output of the datatype callback, not the raw value.
-    $this->assertFormatterRdfa('text_default', 'http://schema.org/interactionCount', 'UserComments:' . $this->number_test);
+    $this->assertFormatterRdfa('text_default', 'http://schema.org/interactionCount', 'foo' . $this->test_value);
   }
 }
 
diff --git a/core/modules/rdf/lib/Drupal/rdf/Tests/Field/TestDataConverter.php b/core/modules/rdf/lib/Drupal/rdf/Tests/Field/TestDataConverter.php
new file mode 100644
index 0000000..63dbc65
--- /dev/null
+++ b/core/modules/rdf/lib/Drupal/rdf/Tests/Field/TestDataConverter.php
@@ -0,0 +1,26 @@
+<?php
+/**
+ * @file
+ * Contains \Drupal\rdf\Tests\Field\TestDataConverter.
+ */
+
+namespace Drupal\rdf\Tests\Field;
+
+
+/**
+ * Contains methods for test data conversions.
+ */
+class TestDataConverter {
+  /**
+   * Provides a passthrough to place unformatted values in content attributes.
+   *
+   * @param mixed $data
+   *   The data to be placed in the content attribute.
+   *
+   * @return mixed
+   *   Returns the data.
+   */
+  static function convertFoo($data) {
+    return 'foo' . $data['value'];
+  }
+}
diff --git a/core/modules/rdf/rdf.module b/core/modules/rdf/rdf.module
index 07abb29..379d4be 100644
--- a/core/modules/rdf/rdf.module
+++ b/core/modules/rdf/rdf.module
@@ -210,7 +210,7 @@ function rdf_entity_prepare_view($entity_type, array $entities, array $displays)
       $field_mapping = $mapping->getPreparedFieldMapping($name);
       if ($field_mapping['properties']) {
         foreach ($entity->get($name) as $item) {
-          $item->html_data_attributes = rdf_rdfa_attributes($field_mapping, $item->getString());
+          $item->html_data_attributes = rdf_rdfa_attributes($field_mapping, $item->getValue());
         }
       }
     }