# jetpack/16.3-a.1/modules/sitemaps/sitemap-buffer-master-xmlwriter.php

Jetpack – WP Security, Backup, Speed, & Growth, version 16.3-a.1. 54 lines.

- Page: https://pluginprobe.com/plugins/jetpack/16.3-a.1/code/modules/sitemaps/sitemap-buffer-master-xmlwriter.php
- Raw: https://pluginprobe.com/plugins/jetpack/16.3-a.1/raw/modules/sitemaps/sitemap-buffer-master-xmlwriter.php
- Modified: 2025-11-24T17:00:32+00:00

Line numbers below start at 1. Link to a line or a range by appending a fragment to the
page URL, for example `https://pluginprobe.com/plugins/jetpack/16.3-a.1/code/modules/sitemaps/sitemap-buffer-master-xmlwriter.php#L10-L20`.

```php
<?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 );
		}
	}
}

```