--- /dev/null
+<?php
+
+namespace Drupal\entity_embed;
+
+use Drupal\Core\Entity\EntityInterface;
+
+/**
+ * Defines services that are responsible for building of embedded entities.
+ *
+ * @internal
+ */
+interface EntityEmbedBuilderInterface {
+
+ /**
+ * Builds the render array for an embedded entity.
+ *
+ * @param \Drupal\Core\Entity\EntityInterface $entity
+ * The entity to be rendered.
+ * @param array $context
+ * (optional) Array of context values, corresponding to the attributes on
+ * the embed HTML tag.
+ *
+ * @return array
+ * A render array.
+ *
+ * @todo improve documentation
+ */
+ public function buildEntityEmbed(EntityInterface $entity, array $context = []);
+
+}