WordPress-importer issue or wrong usage

Hi

I’m developping a theme. I wanted to programatically import some content using the WP_import class (wordpress-importer.php 0.6.4).
At the beginning of my functions.php I define WP_LOAD_IMPORTERS constant (it must be defined for the class to load).

if ( ! defined( 'WP_LOAD_IMPORTERS' ) ) {
    // define should be used outside class definition
    define( 'WP_LOAD_IMPORTERS', true );
}

In my theme import class I’m loading WP_Import class with a code similar to this one.

if ( ! class_exists( 'WP_Import' ) ) {
    $class_wp_import = ABSPATH . 'wp-content/plugins/wordpress-importer/wordpress-importer.php';
    if ( file_exists( $class_wp_import ) ) {
        require_once $class_wp_import;
    } else {
        // issue a message to tell the user to install wordpress-importer
    } 
}

This works if and only if : wordpress-importer.php has been previously installed and is unactivated

When wordpress-importer.php is installed and activated I get different errors:
-when using “require_once”:

• wordpress-importer.php was previously loading and is not loading again
• the WP_Import class was not loaded because WP_LOAD_IMPORTERS was not defined at the time of loading wordpress-importer.php

– when using “require” to load the WP_Import class:

• I get the error reported in some other messages “Fatal error: Cannot redeclare wordpress_importer_init()”

This results from the fact that when WP_LOAD_IMPORTERS is not defined, the WP_Import class is not loaded, but the wordpress_importer_init() function is loaded.

Simple Workaround:

• add “&import” to the admin page URL (in that case, WP_LOAD_IMPORTERS is defined in admin.php, line 31)

Questions:

• Is there a proper/better way to load WP_Import class ?
• Is this a wordpress-importer issue that can be solved be enclosing wordpress_importer_init() function inside and if (!function_exists('wordpress_importer_init')) {...}. In that case it could be possible to reload wordpress-importer.php.

Regards, Christophe