diff --git a/core/lib/Drupal/Core/Field/ConfigEntityReferenceItemBase.php b/core/lib/Drupal/Core/Field/ConfigEntityReferenceItemBase.php
index b4c6720..8ff5913 100644
--- a/core/lib/Drupal/Core/Field/ConfigEntityReferenceItemBase.php
+++ b/core/lib/Drupal/Core/Field/ConfigEntityReferenceItemBase.php
@@ -78,13 +78,13 @@ public function getPropertyDefinitions() {
    * Copied from \Drupal\field\Plugin\Field\FieldType\LegacyConfigFieldItem,
    * since we cannot extend it.
    */
-  public static function schema(FieldInterface $field) {
-    $definition = \Drupal::service('plugin.manager.field.field_type')->getDefinition($field->type);
+  public static function schema(FieldDefinitionInterface $field_definition) {
+    $definition = \Drupal::service('plugin.manager.field.field_type')->getDefinition($field_definition->type);
     $module = $definition['provider'];
     module_load_install($module);
     $callback = "{$module}_field_schema";
     if (function_exists($callback)) {
-      return $callback($field);
+      return $callback($field_definition);
     }
   }
 
diff --git a/core/lib/Drupal/Core/Field/ConfigFieldItemInterface.php b/core/lib/Drupal/Core/Field/ConfigFieldItemInterface.php
index 555070a..3feb103 100644
--- a/core/lib/Drupal/Core/Field/ConfigFieldItemInterface.php
+++ b/core/lib/Drupal/Core/Field/ConfigFieldItemInterface.php
@@ -15,40 +15,6 @@
 interface ConfigFieldItemInterface extends FieldItemInterface {
 
   /**
-   * Returns the schema for the field.
-   *
-   * This method is static, because the field schema information is needed on
-   * creation of the field. No field instances exist by then, and it is not
-   * possible to instantiate a FieldItemInterface object yet.
-   *
-   * @param \Drupal\field\FieldInterface $field
-   *   The field definition.
-   *
-   * @return array
-   *   An associative array with the following key/value pairs:
-   *   - columns: An array of Schema API column specifications, keyed by column
-   *     name. This specifies what comprises a value for a given field. For
-   *     example, a value for a number field is simply 'value', while a value
-   *     for a formatted text field is the combination of 'value' and 'format'.
-   *     It is recommended to avoid having the column definitions depend on
-   *     field settings when possible. No assumptions should be made on how
-   *     storage engines internally use the original column name to structure
-   *     their storage.
-   *   - indexes: (optional) An array of Schema API index definitions. Only
-   *     columns that appear in the 'columns' array are allowed. Those indexes
-   *     will be used as default indexes. Callers of field_create_field() can
-   *     specify additional indexes or, at their own risk, modify the default
-   *     indexes specified by the field-type module. Some storage engines might
-   *     not support indexes.
-   *   - foreign keys: (optional) An array of Schema API foreign key
-   *     definitions. Note, however, that the field data is not necessarily
-   *     stored in SQL. Also, the possible usage is limited, as you cannot
-   *     specify another field as related, only existing SQL tables,
-   *     such as {taxonomy_term_data}.
-   */
-  public static function schema(FieldInterface $field);
-
-  /**
    * Returns a form for the field-level settings.
    *
    * Invoked from \Drupal\field_ui\Form\FieldEditForm to allow administrators to
diff --git a/core/lib/Drupal/Core/Field/FieldDefinition.php b/core/lib/Drupal/Core/Field/FieldDefinition.php
index 6294067..5ebf789 100644
--- a/core/lib/Drupal/Core/Field/FieldDefinition.php
+++ b/core/lib/Drupal/Core/Field/FieldDefinition.php
@@ -338,4 +338,46 @@ public function offsetSet($offset, $value) {
       $this->definition[$offset] = $value;
     }
   }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getSchema() {
+    if (!isset($this->schema)) {
+      // Get the schema from the field item class.
+      $definition = \Drupal::service('plugin.manager.field.field_type')->getDefinition($this->type);
+      $class = $definition['class'];
+      $schema = $class::schema($this);
+      // Fill in default values for optional entries.
+      $schema += array('indexes' => array(), 'foreign keys' => array());
+
+      // Check that the schema does not include forbidden column names.
+      if (array_intersect(array_keys($schema['columns']), static::getReservedColumns())) {
+        throw new FieldException('Illegal field type columns.');
+      }
+
+      // Merge custom indexes with those specified by the field type. Custom
+      // indexes prevail.
+      $schema['indexes'] = $this->indexes + $schema['indexes'];
+
+      $this->schema = $schema;
+    }
+
+    return $this->schema;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getColumns() {
+    $schema = $this->getSchema();
+    // A typical use case for the method is to iterate on the columns, while
+    // some other use cases rely on identifying the first column with the key()
+    // function. Since the schema is persisted in the Field object, we take care
+    // of resetting the array pointer so that the former does not interfere with
+    // the latter.
+    reset($schema['columns']);
+    return $schema['columns'];
+  }
+
 }
diff --git a/core/lib/Drupal/Core/Field/FieldDefinitionInterface.php b/core/lib/Drupal/Core/Field/FieldDefinitionInterface.php
index 4dca17a..274f61c 100644
--- a/core/lib/Drupal/Core/Field/FieldDefinitionInterface.php
+++ b/core/lib/Drupal/Core/Field/FieldDefinitionInterface.php
@@ -209,4 +209,33 @@ public function isFieldMultiple();
    */
   public function getFieldDefaultValue(EntityInterface $entity);
 
+  /**
+   * Returns the field schema.
+   *
+   * @return array
+   *   The field schema, as an array of key/value pairs in the format returned
+   *   by hook_field_schema():
+   *   - columns: An array of Schema API column specifications, keyed by column
+   *     name. This specifies what comprises a single value for a given field.
+   *     No assumptions should be made on how storage backends internally use
+   *     the original column name to structure their storage.
+   *   - indexes: An array of Schema API index definitions. Some storage
+   *     backends might not support indexes.
+   *   - foreign keys: An array of Schema API foreign key definitions. Note,
+   *     however, that depending on the storage backend specified for the field,
+   *     the field data is not necessarily stored in SQL.
+   */
+  public function getSchema();
+
+  /**
+   * Returns the field columns, as defined in the field schema.
+   *
+   * @return array
+   *   The array of field columns, keyed by column name, in the same format
+   *   returned by getSchema().
+   *
+   * @see \Drupal\field\Entity\FieldInterface::getSchema()
+   */
+  public function getColumns();
+
 }
diff --git a/core/lib/Drupal/Core/Field/FieldItemBase.php b/core/lib/Drupal/Core/Field/FieldItemBase.php
index 4645936..857c056 100644
--- a/core/lib/Drupal/Core/Field/FieldItemBase.php
+++ b/core/lib/Drupal/Core/Field/FieldItemBase.php
@@ -39,6 +39,16 @@ public function __construct($definition, $name = NULL, TypedDataInterface $paren
   /**
    * {@inheritdoc}
    */
+  public static function schema(FieldDefinitionInterface $field_definition) {
+    // @todo Remove when all field types will declare their schema.
+    return array(
+      'columns' => array(),
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
   public function getEntity() {
     return $this->getParent()->getEntity();
   }
diff --git a/core/lib/Drupal/Core/Field/FieldItemInterface.php b/core/lib/Drupal/Core/Field/FieldItemInterface.php
index 5524cb4..4b40668 100644
--- a/core/lib/Drupal/Core/Field/FieldItemInterface.php
+++ b/core/lib/Drupal/Core/Field/FieldItemInterface.php
@@ -24,6 +24,40 @@
 interface FieldItemInterface extends ComplexDataInterface {
 
   /**
+   * Returns the schema for the field.
+   *
+   * This method is static, because the field schema information is needed on
+   * creation of the field. No field instances exist by then, and it is not
+   * possible to instantiate a FieldItemInterface object yet.
+   *
+   * @param \Drupal\Core\Field\FieldDefinitionInterface $field_definition
+   *   The field definition.
+   *
+   * @return array
+   *   An associative array with the following key/value pairs:
+   *   - columns: An array of Schema API column specifications, keyed by column
+   *     name. This specifies what comprises a value for a given field. For
+   *     example, a value for a number field is simply 'value', while a value
+   *     for a formatted text field is the combination of 'value' and 'format'.
+   *     It is recommended to avoid having the column definitions depend on
+   *     field settings when possible. No assumptions should be made on how
+   *     storage engines internally use the original column name to structure
+   *     their storage.
+   *   - indexes: (optional) An array of Schema API index definitions. Only
+   *     columns that appear in the 'columns' array are allowed. Those indexes
+   *     will be used as default indexes. Callers of field_create_field() can
+   *     specify additional indexes or, at their own risk, modify the default
+   *     indexes specified by the field-type module. Some storage engines might
+   *     not support indexes.
+   *   - foreign keys: (optional) An array of Schema API foreign key
+   *     definitions. Note, however, that the field data is not necessarily
+   *     stored in SQL. Also, the possible usage is limited, as you cannot
+   *     specify another field as related, only existing SQL tables,
+   *     such as {taxonomy_term_data}.
+   */
+  public static function schema(FieldDefinitionInterface $field_definition);
+
+  /**
    * Gets the entity that field belongs to.
    *
    * @return \Drupal\Core\Entity\EntityInterface
diff --git a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/LegacyConfigFieldItem.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/LegacyConfigFieldItem.php
index 336f0f8..dc73093 100644
--- a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/LegacyConfigFieldItem.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/LegacyConfigFieldItem.php
@@ -7,10 +7,10 @@
 
 namespace Drupal\Core\Field\Plugin\Field\FieldType;
 
+use Drupal\Core\Field\FieldDefinitionInterface;
 use Drupal\Core\Field\PrepareCacheInterface;
 use Drupal\Core\Entity\EntityStorageControllerInterface;
 use Drupal\Core\Field\ConfigFieldItemBase;
-use Drupal\field\FieldInterface;
 use Drupal\field\FieldInstanceInterface;
 
 /**
@@ -31,13 +31,13 @@
   /**
    * {@inheritdoc}
    */
-  public static function schema(FieldInterface $field) {
-    $definition = \Drupal::service('plugin.manager.field.field_type')->getDefinition($field->type);
+  public static function schema(FieldDefinitionInterface $field_definition) {
+    $definition = \Drupal::service('plugin.manager.field.field_type')->getDefinition($field_definition->type);
     $module = $definition['provider'];
     module_load_install($module);
     $callback = "{$module}_field_schema";
     if (function_exists($callback)) {
-      return $callback($field);
+      return $callback($field_definition);
     }
   }
 
diff --git a/core/modules/comment/lib/Drupal/comment/Plugin/Field/FieldType/CommentItem.php b/core/modules/comment/lib/Drupal/comment/Plugin/Field/FieldType/CommentItem.php
index c91f1bb..b3f16cc 100644
--- a/core/modules/comment/lib/Drupal/comment/Plugin/Field/FieldType/CommentItem.php
+++ b/core/modules/comment/lib/Drupal/comment/Plugin/Field/FieldType/CommentItem.php
@@ -7,7 +7,7 @@
 
 namespace Drupal\comment\Plugin\Field\FieldType;
 
-use Drupal\field\FieldInterface;
+use Drupal\Core\Field\FieldDefinitionInterface;
 use Drupal\Core\Field\ConfigFieldItemBase;
 
 /**
@@ -79,7 +79,7 @@ public function getPropertyDefinitions() {
   /**
    * {@inheritdoc}
    */
-  public static function schema(FieldInterface $field) {
+  public static function schema(FieldDefinitionInterface $field_definition) {
     return array(
       'columns' => array(
         'status' => array(
diff --git a/core/modules/datetime/lib/Drupal/datetime/Plugin/Field/FieldType/DateTimeItem.php b/core/modules/datetime/lib/Drupal/datetime/Plugin/Field/FieldType/DateTimeItem.php
index e4cad9a..a163f35 100644
--- a/core/modules/datetime/lib/Drupal/datetime/Plugin/Field/FieldType/DateTimeItem.php
+++ b/core/modules/datetime/lib/Drupal/datetime/Plugin/Field/FieldType/DateTimeItem.php
@@ -8,8 +8,8 @@
 namespace Drupal\datetime\Plugin\Field\FieldType;
 
 use Drupal\Core\Datetime\DrupalDateTime;
+use Drupal\Core\Field\FieldDefinitionInterface;
 use Drupal\Core\Field\PrepareCacheInterface;
-use Drupal\field\FieldInterface;
 use Drupal\Core\Field\ConfigFieldItemBase;
 
 /**
@@ -65,7 +65,7 @@ public function getPropertyDefinitions() {
   /**
    * {@inheritdoc}
    */
-  public static function schema(FieldInterface $field) {
+  public static function schema(FieldDefinitionInterface $field_definition) {
     return array(
       'columns' => array(
         'value' => array(
diff --git a/core/modules/email/lib/Drupal/email/ConfigurableEmailItem.php b/core/modules/email/lib/Drupal/email/ConfigurableEmailItem.php
index 5b0ff24..3701b0c 100644
--- a/core/modules/email/lib/Drupal/email/ConfigurableEmailItem.php
+++ b/core/modules/email/lib/Drupal/email/ConfigurableEmailItem.php
@@ -7,6 +7,7 @@
 
 namespace Drupal\email;
 
+use Drupal\Core\Field\FieldDefinitionInterface;
 use Drupal\Core\Field\Plugin\Field\FieldType\EmailItem;
 use Drupal\field\FieldInterface;
 use Drupal\Core\Field\ConfigFieldItemInterface;
@@ -33,7 +34,7 @@ class ConfigurableEmailItem extends EmailItem implements ConfigFieldItemInterfac
   /**
    * {@inheritdoc}
    */
-  public static function schema(FieldInterface $field) {
+  public static function schema(FieldDefinitionInterface $field_definition) {
     return array(
       'columns' => array(
         'value' => array(
diff --git a/core/modules/entity_reference/lib/Drupal/entity_reference/ConfigurableEntityReferenceItem.php b/core/modules/entity_reference/lib/Drupal/entity_reference/ConfigurableEntityReferenceItem.php
index bf58a7f..fd93f8d 100644
--- a/core/modules/entity_reference/lib/Drupal/entity_reference/ConfigurableEntityReferenceItem.php
+++ b/core/modules/entity_reference/lib/Drupal/entity_reference/ConfigurableEntityReferenceItem.php
@@ -7,6 +7,7 @@
 
 namespace Drupal\entity_reference;
 
+use Drupal\Core\Field\FieldDefinitionInterface;
 use Drupal\field\FieldInterface;
 use Drupal\Core\Field\ConfigEntityReferenceItemBase;
 use Drupal\Core\Field\ConfigFieldItemInterface;
@@ -25,8 +26,8 @@ class ConfigurableEntityReferenceItem extends ConfigEntityReferenceItemBase impl
   /**
    * {@inheritdoc}
    */
-  public static function schema(FieldInterface $field) {
-    $target_type = $field->getFieldSetting('target_type');
+  public static function schema(FieldDefinitionInterface $field_definition) {
+    $target_type = $field_definition->getFieldSetting('target_type');
     $target_type_info = \Drupal::entityManager()->getDefinition($target_type);
 
     if (is_subclass_of($target_type_info['class'], '\Drupal\Core\Entity\ContentEntityInterface')) {
diff --git a/core/modules/field/lib/Drupal/field/Entity/Field.php b/core/modules/field/lib/Drupal/field/Entity/Field.php
index 9a032df..29ff0d0 100644
--- a/core/modules/field/lib/Drupal/field/Entity/Field.php
+++ b/core/modules/field/lib/Drupal/field/Entity/Field.php
@@ -460,47 +460,6 @@ public function delete() {
   /**
    * {@inheritdoc}
    */
-  public function getSchema() {
-    if (!isset($this->schema)) {
-      // Get the schema from the field item class.
-      $definition = \Drupal::service('plugin.manager.field.field_type')->getDefinition($this->type);
-      $class = $definition['class'];
-      $schema = $class::schema($this);
-      // Fill in default values for optional entries.
-      $schema += array('indexes' => array(), 'foreign keys' => array());
-
-      // Check that the schema does not include forbidden column names.
-      if (array_intersect(array_keys($schema['columns']), static::getReservedColumns())) {
-        throw new FieldException('Illegal field type columns.');
-      }
-
-      // Merge custom indexes with those specified by the field type. Custom
-      // indexes prevail.
-      $schema['indexes'] = $this->indexes + $schema['indexes'];
-
-      $this->schema = $schema;
-    }
-
-    return $this->schema;
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function getColumns() {
-    $schema = $this->getSchema();
-    // A typical use case for the method is to iterate on the columns, while
-    // some other use cases rely on identifying the first column with the key()
-    // function. Since the schema is persisted in the Field object, we take care
-    // of resetting the array pointer so that the former does not interfere with
-    // the latter.
-    reset($schema['columns']);
-    return $schema['columns'];
-  }
-
-  /**
-   * {@inheritdoc}
-   */
   public function getBundles() {
     if (empty($this->deleted)) {
       $map = field_info_field_map();
diff --git a/core/modules/field/lib/Drupal/field/FieldInterface.php b/core/modules/field/lib/Drupal/field/FieldInterface.php
index 78de421..ed2658c 100644
--- a/core/modules/field/lib/Drupal/field/FieldInterface.php
+++ b/core/modules/field/lib/Drupal/field/FieldInterface.php
@@ -16,35 +16,6 @@
 interface FieldInterface extends ConfigEntityInterface, FieldDefinitionInterface {
 
   /**
-   * Returns the field schema.
-   *
-   * @return array
-   *   The field schema, as an array of key/value pairs in the format returned
-   *   by hook_field_schema():
-   *   - columns: An array of Schema API column specifications, keyed by column
-   *     name. This specifies what comprises a single value for a given field.
-   *     No assumptions should be made on how storage backends internally use
-   *     the original column name to structure their storage.
-   *   - indexes: An array of Schema API index definitions. Some storage
-   *     backends might not support indexes.
-   *   - foreign keys: An array of Schema API foreign key definitions. Note,
-   *     however, that depending on the storage backend specified for the field,
-   *     the field data is not necessarily stored in SQL.
-   */
-  public function getSchema();
-
-  /**
-   * Returns the field columns, as defined in the field schema.
-   *
-   * @return array
-   *   The array of field columns, keyed by column name, in the same format
-   *   returned by getSchema().
-   *
-   * @see \Drupal\field\Entity\FieldInterface::getSchema()
-   */
-  public function getColumns();
-
-  /**
    * Returns the list of bundles where the field has instances.
    *
    * @return array
diff --git a/core/modules/field/tests/modules/field_test/lib/Drupal/field_test/Plugin/Field/FieldType/ShapeItem.php b/core/modules/field/tests/modules/field_test/lib/Drupal/field_test/Plugin/Field/FieldType/ShapeItem.php
index 32dedba..543169d 100644
--- a/core/modules/field/tests/modules/field_test/lib/Drupal/field_test/Plugin/Field/FieldType/ShapeItem.php
+++ b/core/modules/field/tests/modules/field_test/lib/Drupal/field_test/Plugin/Field/FieldType/ShapeItem.php
@@ -7,6 +7,7 @@
 
 namespace Drupal\field_test\Plugin\Field\FieldType;
 
+use Drupal\Core\Field\FieldDefinitionInterface;
 use Drupal\field\FieldInterface;
 use Drupal\Core\Field\ConfigFieldItemBase;
 
@@ -56,16 +57,16 @@ public function getPropertyDefinitions() {
   /**
    * {@inheritdoc}
    */
-  public static function schema(FieldInterface $field) {
+  public static function schema(FieldDefinitionInterface $field_definition) {
     $foreign_keys = array();
     // The 'foreign keys' key is not always used in tests.
-    if ($field->getFieldSetting('foreign_key_name')) {
+    if ($field_definition->getFieldSetting('foreign_key_name')) {
       $foreign_keys['foreign keys'] = array(
         // This is a dummy foreign key definition, references a table that
         // doesn't exist, but that's not a problem.
-        $field->getFieldSetting('foreign_key_name') => array(
-          'table' => $field->getFieldSetting('foreign_key_name'),
-          'columns' => array($field->getFieldSetting('foreign_key_name') => 'id'),
+        $field_definition->getFieldSetting('foreign_key_name') => array(
+          'table' => $field_definition->getFieldSetting('foreign_key_name'),
+          'columns' => array($field_definition->getFieldSetting('foreign_key_name') => 'id'),
         ),
       );
     }
diff --git a/core/modules/field/tests/modules/field_test/lib/Drupal/field_test/Plugin/Field/FieldType/TestItem.php b/core/modules/field/tests/modules/field_test/lib/Drupal/field_test/Plugin/Field/FieldType/TestItem.php
index 79ac618..ba7f8a1 100644
--- a/core/modules/field/tests/modules/field_test/lib/Drupal/field_test/Plugin/Field/FieldType/TestItem.php
+++ b/core/modules/field/tests/modules/field_test/lib/Drupal/field_test/Plugin/Field/FieldType/TestItem.php
@@ -9,6 +9,7 @@
 
 use Drupal\Core\Entity\Annotation\FieldType;
 use Drupal\Core\Annotation\Translation;
+use Drupal\Core\Field\FieldDefinitionInterface;
 use Drupal\Core\Field\PrepareCacheInterface;
 use Drupal\field\FieldInterface;
 use Drupal\Core\Field\ConfigFieldItemBase;
@@ -61,7 +62,7 @@ public function getPropertyDefinitions() {
   /**
    * {@inheritdoc}
    */
-  public static function schema(FieldInterface $field) {
+  public static function schema(FieldDefinitionInterface $field_definition) {
     return array(
       'columns' => array(
         'value' => array(
diff --git a/core/modules/file/lib/Drupal/file/Plugin/Field/FieldType/FileItem.php b/core/modules/file/lib/Drupal/file/Plugin/Field/FieldType/FileItem.php
index 2173689..818262d 100644
--- a/core/modules/file/lib/Drupal/file/Plugin/Field/FieldType/FileItem.php
+++ b/core/modules/file/lib/Drupal/file/Plugin/Field/FieldType/FileItem.php
@@ -7,6 +7,7 @@
 
 namespace Drupal\file\Plugin\Field\FieldType;
 
+use Drupal\Core\Field\FieldDefinitionInterface;
 use Drupal\Core\Field\Plugin\Field\FieldType\EntityReferenceItem;
 use Drupal\field\FieldInterface;
 use Drupal\Core\Field\ConfigFieldItemInterface;
@@ -48,7 +49,7 @@ class FileItem extends EntityReferenceItem implements ConfigFieldItemInterface {
   /**
    * {@inheritdoc}
    */
-  public static function schema(FieldInterface $field) {
+  public static function schema(FieldDefinitionInterface $field_definition) {
     return array(
       'columns' => array(
         'target_id' => array(
diff --git a/core/modules/image/lib/Drupal/image/Plugin/Field/FieldType/ImageItem.php b/core/modules/image/lib/Drupal/image/Plugin/Field/FieldType/ImageItem.php
index b697465..ea490aa 100644
--- a/core/modules/image/lib/Drupal/image/Plugin/Field/FieldType/ImageItem.php
+++ b/core/modules/image/lib/Drupal/image/Plugin/Field/FieldType/ImageItem.php
@@ -7,6 +7,7 @@
 
 namespace Drupal\image\Plugin\Field\FieldType;
 
+use Drupal\Core\Field\FieldDefinitionInterface;
 use Drupal\field\FieldInterface;
 use Drupal\file\Plugin\Field\FieldType\FileItem;
 
@@ -69,7 +70,7 @@ class ImageItem extends FileItem {
   /**
    * {@inheritdoc}
    */
-  public static function schema(FieldInterface $field) {
+  public static function schema(FieldDefinitionInterface $field_definition) {
     return array(
       'columns' => array(
         'target_id' => array(
diff --git a/core/modules/link/lib/Drupal/link/Plugin/Field/FieldType/LinkItem.php b/core/modules/link/lib/Drupal/link/Plugin/Field/FieldType/LinkItem.php
index 55fcc38..60fd01a 100644
--- a/core/modules/link/lib/Drupal/link/Plugin/Field/FieldType/LinkItem.php
+++ b/core/modules/link/lib/Drupal/link/Plugin/Field/FieldType/LinkItem.php
@@ -8,6 +8,7 @@
 namespace Drupal\link\Plugin\Field\FieldType;
 
 use Drupal\Core\Field\ConfigFieldItemBase;
+use Drupal\Core\Field\FieldDefinitionInterface;
 use Drupal\field\FieldInterface;
 
 /**
@@ -57,7 +58,7 @@ public function getPropertyDefinitions() {
   /**
    * {@inheritdoc}
    */
-  public static function schema(FieldInterface $field) {
+  public static function schema(FieldDefinitionInterface $field_definition) {
     return array(
       'columns' => array(
         'url' => array(
diff --git a/core/modules/number/lib/Drupal/number/Plugin/Field/FieldType/DecimalItem.php b/core/modules/number/lib/Drupal/number/Plugin/Field/FieldType/DecimalItem.php
index 6dbb3c4..7aedb0b 100644
--- a/core/modules/number/lib/Drupal/number/Plugin/Field/FieldType/DecimalItem.php
+++ b/core/modules/number/lib/Drupal/number/Plugin/Field/FieldType/DecimalItem.php
@@ -7,6 +7,7 @@
 
 namespace Drupal\number\Plugin\Field\FieldType;
 
+use Drupal\Core\Field\FieldDefinitionInterface;
 use Drupal\field\FieldInterface;
 use Drupal\Component\Utility\MapArray;
 
@@ -49,13 +50,13 @@ public function getPropertyDefinitions() {
   /**
    * {@inheritdoc}
    */
-  public static function schema(FieldInterface $field) {
+  public static function schema(FieldDefinitionInterface $field_definition) {
     return array(
       'columns' => array(
         'value' => array(
           'type' => 'numeric',
-          'precision' => $field->settings['precision'],
-          'scale' => $field->settings['scale'],
+          'precision' => $field_definition->settings['precision'],
+          'scale' => $field_definition->settings['scale'],
           'not null' => FALSE
         )
       ),
diff --git a/core/modules/number/lib/Drupal/number/Plugin/Field/FieldType/FloatItem.php b/core/modules/number/lib/Drupal/number/Plugin/Field/FieldType/FloatItem.php
index 3a58097..4090803 100644
--- a/core/modules/number/lib/Drupal/number/Plugin/Field/FieldType/FloatItem.php
+++ b/core/modules/number/lib/Drupal/number/Plugin/Field/FieldType/FloatItem.php
@@ -7,6 +7,7 @@
 
 namespace Drupal\number\Plugin\Field\FieldType;
 
+use Drupal\Core\Field\FieldDefinitionInterface;
 use Drupal\field\FieldInterface;
 
 /**
@@ -44,7 +45,7 @@ public function getPropertyDefinitions() {
   /**
    * {@inheritdoc}
    */
-  public static function schema(FieldInterface $field) {
+  public static function schema(FieldDefinitionInterface $field_definition) {
     return array(
       'columns' => array(
         'value' => array(
diff --git a/core/modules/number/lib/Drupal/number/Plugin/Field/FieldType/IntegerItem.php b/core/modules/number/lib/Drupal/number/Plugin/Field/FieldType/IntegerItem.php
index 52954df..a43a7cd 100644
--- a/core/modules/number/lib/Drupal/number/Plugin/Field/FieldType/IntegerItem.php
+++ b/core/modules/number/lib/Drupal/number/Plugin/Field/FieldType/IntegerItem.php
@@ -7,6 +7,7 @@
 
 namespace Drupal\number\Plugin\Field\FieldType;
 
+use Drupal\Core\Field\FieldDefinitionInterface;
 use Drupal\field\FieldInterface;
 
 /**
@@ -44,7 +45,7 @@ public function getPropertyDefinitions() {
   /**
    * {@inheritdoc}
    */
-  public static function schema(FieldInterface $field) {
+  public static function schema(FieldDefinitionInterface $field_definition) {
     return array(
       'columns' => array(
         'value' => array(
diff --git a/core/modules/telephone/lib/Drupal/telephone/Plugin/Field/FieldType/TelephoneItem.php b/core/modules/telephone/lib/Drupal/telephone/Plugin/Field/FieldType/TelephoneItem.php
index 032da92..cdb2243 100644
--- a/core/modules/telephone/lib/Drupal/telephone/Plugin/Field/FieldType/TelephoneItem.php
+++ b/core/modules/telephone/lib/Drupal/telephone/Plugin/Field/FieldType/TelephoneItem.php
@@ -8,6 +8,7 @@
 namespace Drupal\telephone\Plugin\Field\FieldType;
 
 use Drupal\Core\Field\ConfigFieldItemBase;
+use Drupal\Core\Field\FieldDefinitionInterface;
 use Drupal\field\FieldInterface;
 
 /**
@@ -33,7 +34,7 @@ class TelephoneItem extends ConfigFieldItemBase {
   /**
    * {@inheritdoc}
    */
-  public static function schema(FieldInterface $field) {
+  public static function schema(FieldDefinitionInterface $field_definition) {
     return array(
       'columns' => array(
         'value' => array(
diff --git a/core/modules/text/lib/Drupal/text/Plugin/Field/FieldType/TextItem.php b/core/modules/text/lib/Drupal/text/Plugin/Field/FieldType/TextItem.php
index ec92b9d..bc0857f 100644
--- a/core/modules/text/lib/Drupal/text/Plugin/Field/FieldType/TextItem.php
+++ b/core/modules/text/lib/Drupal/text/Plugin/Field/FieldType/TextItem.php
@@ -7,6 +7,7 @@
 
 namespace Drupal\text\Plugin\Field\FieldType;
 
+use Drupal\Core\Field\FieldDefinitionInterface;
 use Drupal\field\FieldInterface;
 
 /**
@@ -31,12 +32,12 @@ class TextItem extends TextItemBase {
   /**
    * {@inheritdoc}
    */
-  public static function schema(FieldInterface $field) {
+  public static function schema(FieldDefinitionInterface $field_definition) {
     return array(
       'columns' => array(
         'value' => array(
           'type' => 'varchar',
-          'length' => $field->settings['max_length'],
+          'length' => $field_definition->settings['max_length'],
           'not null' => FALSE,
         ),
         'format' => array(
diff --git a/core/modules/text/lib/Drupal/text/Plugin/Field/FieldType/TextLongItem.php b/core/modules/text/lib/Drupal/text/Plugin/Field/FieldType/TextLongItem.php
index 37c4445..3bde39f 100644
--- a/core/modules/text/lib/Drupal/text/Plugin/Field/FieldType/TextLongItem.php
+++ b/core/modules/text/lib/Drupal/text/Plugin/Field/FieldType/TextLongItem.php
@@ -7,6 +7,7 @@
 
 namespace Drupal\text\Plugin\Field\FieldType;
 
+use Drupal\Core\Field\FieldDefinitionInterface;
 use Drupal\field\FieldInterface;
 
 /**
@@ -28,7 +29,7 @@ class TextLongItem extends TextItemBase {
   /**
    * {@inheritdoc}
    */
-  public static function schema(FieldInterface $field) {
+  public static function schema(FieldDefinitionInterface $field_definition) {
     return array(
       'columns' => array(
         'value' => array(
diff --git a/core/modules/text/lib/Drupal/text/Plugin/Field/FieldType/TextWithSummaryItem.php b/core/modules/text/lib/Drupal/text/Plugin/Field/FieldType/TextWithSummaryItem.php
index 0d3c138..a155a9b 100644
--- a/core/modules/text/lib/Drupal/text/Plugin/Field/FieldType/TextWithSummaryItem.php
+++ b/core/modules/text/lib/Drupal/text/Plugin/Field/FieldType/TextWithSummaryItem.php
@@ -7,6 +7,7 @@
 
 namespace Drupal\text\Plugin\Field\FieldType;
 
+use Drupal\Core\Field\FieldDefinitionInterface;
 use Drupal\field\FieldInterface;
 
 /**
@@ -61,7 +62,7 @@ public function getPropertyDefinitions() {
   /**
    * {@inheritdoc}
    */
-  public static function schema(FieldInterface $field) {
+  public static function schema(FieldDefinitionInterface $field_definition) {
     return array(
       'columns' => array(
         'value' => array(