parent_post_rel_link filter-hook . WP 1.0

Usage

add_filter( 'parent_post_rel_link', 'filter_function_name_4000' );
function filter_function_name_4000( $link ){
	// filter...

	return $link;
}

$link

-

Where the hook is called

return apply_filters( "parent_post_rel_link", $link );

Where in WP core the hook is used