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diff --git a/web/core/lib/Drupal/Core/Config/Schema/SequenceDataDefinition.php b/web/core/lib/Drupal/Core/Config/Schema/SequenceDataDefinition.php
new file mode 100644
index 000000000..c317e29e0
--- /dev/null
+++ b/web/core/lib/Drupal/Core/Config/Schema/SequenceDataDefinition.php
@@ -0,0 +1,28 @@
+<?php
+
+namespace Drupal\Core\Config\Schema;
+
+use Drupal\Core\TypedData\ListDataDefinition;
+
+/**
+ * A typed data definition class for defining sequences in configuration.
+ */
+class SequenceDataDefinition extends ListDataDefinition {
+
+  /**
+   * Gets the description of how the sequence should be sorted.
+   *
+   * Only the top level of the array should be sorted. Top-level keys should be
+   * discarded when using 'value' sorting. If the sequence is an associative
+   * array 'key' sorting is recommended, if not 'value' sorting is recommended.
+   *
+   * @return string|null
+   *   May be 'key' (to sort by key), 'value' (to sort by value, discarding
+   *   keys), or NULL (if the schema does not describe how the sequence should
+   *   be sorted).
+   */
+  public function getOrderBy() {
+    return isset($this->definition['orderby']) ? $this->definition['orderby'] : NULL;
+  }
+
+}