--- /dev/null
+<?php
+
+namespace Drupal\views\Plugin\views\field;
+
+use Drupal\views\ResultRow;
+
+/**
+ * Defines a field hander which renders multiple items per row.
+ */
+interface MultiItemsFieldHandlerInterface extends FieldHandlerInterface {
+
+ /**
+ * Renders a single item of a row.
+ *
+ * @param int $count
+ * The index of the item inside the row.
+ * @param mixed $item
+ * The item for the field to render.
+ *
+ * @return string
+ * The rendered output.
+ */
+ public function render_item($count, $item);
+
+ /**
+ * Gets an array of items for the field.
+ *
+ * @param \Drupal\views\ResultRow $values
+ * The result row object containing the values.
+ *
+ * @return array
+ * An array of items for the field.
+ */
+ public function getItems(ResultRow $values);
+
+ /**
+ * Render all items in this field together.
+ *
+ * @param array $items
+ * The items provided by getItems for a single row.
+ *
+ * @return string
+ * The rendered items.
+ */
+ public function renderItems($items);
+
+}