What is basic structure of xml for importing a page in wordpress?

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WordPress has a full load of Importer Plugins that you can install from the ~/wp-admin/tools/import screen. They will serve as nice reference.

Then there’s Ralf Alberts @Ralf912 Importer skeleton on GitHub/Gist which you can take as reference. Please note that this skeleton uses namespaces and therefore requires PHP 5.3+, or a rewrite.

The main/important parts are the following:

  1. Check if the request comes from admin.php?import=...

    if ( ! defined( 'WP_LOAD_IMPORTERS' ) )
    return;

  2. Load Importer API (Importer API = Backendpage admin.php?import=...)

    require_once ABSPATH . 'wp-admin/includes/import.php';

  3. Load the importer base class

    if ( ! class_exists( 'WP_Importer' ) ) {
    $class_wp_importer = ABSPATH . 'wp-admin/includes/class-wp-importer.php';
    if ( file_exists( $class_wp_importer ) )
        require $class_wp_importer;
}

  4. Register your Custom Importer to WordPress by using register_importer() – Codex explanation

    register_importer(
    'custom',
    'CustomPress',
    __('Import <strong>posts</strong> or not.', 'custom-importer'),
    array(
        new Custom_Import(),
        'dispatch'
        )
);