insomniax

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  • It’s probably JetPack. See jetpack/modules/enhanced-distribution.php

    
add_action( 'rss_head',  'jetpack_enhanced_distribution_feed_id' );
add_action( 'rss_item',  'jetpack_enhanced_distribution_post_id' );
add_action( 'rss2_head', 'jetpack_enhanced_distribution_feed_id' );
add_action( 'rss2_item', 'jetpack_enhanced_distribution_post_id' );

function jetpack_enhanced_distribution_feed_id(){
	(int) $id = Jetpack_Options::get_option( 'id' );
	if ( $id > 0 ) {
		$output = sprintf( '<site xmlns="com-wordpress:feed-additions:1">%d</site>', $id );
		echo $output;
	}
}

function jetpack_enhanced_distribution_post_id(){
	$id = get_the_ID();
	if ( $id ) {
		$output = sprintf( '<post-id xmlns="com-wordpress:feed-additions:1">%d</post-id>', $id );
		echo $output;
	}
}
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