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wp-content/plugins/jetpack/modules/sitemaps/sitemap-buffer-master-xmlwriter.php

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+<?php // phpcs:ignore WordPress.Files.FileName.InvalidClassFileName
+/**
+ * XMLWriter implementation of the master sitemap buffer.
+ *
+ * @since 14.6
+ * @package automattic/jetpack
+ */
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit( 0 );
+}
+
+/**
+ * A buffer for constructing master sitemap xml files using XMLWriter.
+ *
+ * @since 14.6
+ */
+class Jetpack_Sitemap_Buffer_Master_XMLWriter extends Jetpack_Sitemap_Buffer_XMLWriter {
+
+	/**
+	 * Initialize the buffer with required headers (no root element here).
+	 */
+	protected function initialize_buffer() {
+		// Add generator comment
+		$this->writer->writeComment( "generator='jetpack-" . JETPACK__VERSION . "'" );
+		$this->writer->writeComment( 'Jetpack_Sitemap_Buffer_Master_XMLWriter' );
+
+		// Add stylesheet
+		$this->writer->writePi(
+			'xml-stylesheet',
+			'type="text/xsl" href="' . $this->finder->construct_sitemap_url( 'sitemap-index.xsl' ) . '"'
+		);
+	}
+
+	/**
+	 * Start the root element and write its namespaces.
+	 */
+	protected function start_root() {
+		$this->writer->startElement( 'sitemapindex' );
+		$this->writer->writeAttribute( 'xmlns', 'http://www.sitemaps.org/schemas/sitemap/0.9' );
+	}
+
+	/**
+	 * Append a sitemap entry to the master sitemap.
+	 *
+	 * @param array $array The sitemap item to append.
+	 */
+	protected function append_item( $array ) {
+		if ( ! empty( $array['sitemap'] ) ) {
+			$this->array_to_xml( $array );
+		}
+	}
+}