--- /dev/null
+<?php
+
+namespace Drupal\Core\Entity\Sql;
+
+use Drupal\Core\Entity\EntityStorageInterface;
+
+/**
+ * A common interface for SQL-based entity storage implementations.
+ */
+interface SqlEntityStorageInterface extends EntityStorageInterface {
+
+ /**
+ * Gets a table mapping for the entity's SQL tables.
+ *
+ * @param \Drupal\Core\Field\FieldStorageDefinitionInterface[] $storage_definitions
+ * (optional) An array of field storage definitions to be used to compute
+ * the table mapping. Defaults to the ones provided by the entity manager.
+ *
+ * @return \Drupal\Core\Entity\Sql\TableMappingInterface
+ * A table mapping object for the entity's tables.
+ */
+ public function getTableMapping(array $storage_definitions = NULL);
+
+}