gistfile1.php

<?php
/**
 * @package Custom post type relation test
 * @version 0.1
 */
/*
Plugin Name: Custom post type relation test
Plugin URI: http://wordpress.org/#
Description: Custom post type relation test
Author: Laurent Dinclaux <lox.dev@knc.nc>
Version: 0.1
Author URI: http://www.knc.nc
*/

/* registers post type */
$args = new ArrayObject(array(), ArrayObject::ARRAY_AS_PROPS);

$args->label = 'Movie';
$args->public = true;
$args->supports = explode(',', 'title,editor,excerpt,page-attributes');
register_post_type( 'movie', (array)$args );

$args->label = 'Actor';
register_post_type( 'actor', (array)$args );

/* registers taxonomy */
$args = new ArrayObject(array(), ArrayObject::ARRAY_AS_PROPS);
$args->label = 'Actors';

register_taxonomy('actors',array('movie', 'actor'), (array)$args );

function cptr_transition_post_status ($new_status, $old_status, $post) {
	
	if($post->post_type === 'actor') {
		
		// status changes
		if($new_status !== $old_status) {
			if($new_status === 'publish') {
				wp_set_object_terms($post->ID, $post->post_name, 'actors');
			}
			else {

				if($term =  get_term_by( 'name', $post->post_name, 'actors' ) ) {
					wp_delete_term($term->term_id, 'actors');
				}
					
			}
		}
		
		// no status change and status is publish
		if( $new_status === $old_status && $new_status === 'publish') {
			
			// updates the taxonomy name if needed
			
		}
	}

}
add_action('transition_post_status', 'cptr_transition_post_status', 10,3);

?>