--- /dev/null
+<?php
+
+namespace Drupal\Component\Gettext;
+
+/**
+ * Shared interface definition for all Gettext PO Writers.
+ */
+interface PoWriterInterface extends PoMetadataInterface {
+
+ /**
+ * Writes the given item.
+ *
+ * @param PoItem $item
+ * One specific item to write.
+ */
+ public function writeItem(PoItem $item);
+
+ /**
+ * Writes all or the given amount of items.
+ *
+ * @param PoReaderInterface $reader
+ * Reader to read PoItems from.
+ * @param $count
+ * Amount of items to read from $reader to write. If -1, all items are
+ * read from $reader.
+ */
+ public function writeItems(PoReaderInterface $reader, $count = -1);
+
+}