Automattic / jetpack

				// Only include title if not empty.

				/** This filter is documented in wp-includes/feed.php */

				if ( $attachment_title = apply_filters( 'the_title_rss', $attachment->post_title ) ) {

					$url['image:image']['title'] = html_entity_decode( esc_html( $attachment_title ), ENT_XML1 );

				}

				// Only include caption if not empty.

				/** This filter is documented in wp-includes/feed.php */

				// Only include caption if not empty.

				/** This filter is documented in wp-includes/feed.php */

				if ( $attachment_caption = apply_filters( 'the_excerpt_rss', $attachment->post_excerpt ) ) {

					$url['image:image']['caption'] = html_entity_decode( esc_html( $attachment_caption ), ENT_XML1 );

				}

			}

		}