islandora/plugins/islandora_newspaper/islandora_newspaper.module

<?php

/**
 * Implementation of hook_requried_fedora_objects()
 */
function islandora_newspaper_required_fedora_objects() {
  // array( 'path-to-foxml-file', 'pid', 'dsid', 'path-to-datastream-file', int dsversion, boolean required)
  $module_path = drupal_get_path('module', 'islandora_newspaper');
  return array(
    'Islandora Newspapers' => array(
      array(
        'foxml_file' => "$module_path/newspapers_issueCModel.xml", 
        'pid' => 'newspapers:issueCModel',
        'dsid' => NULL,
        'datastream_file' => NULL,
        'dsversion' => NULL,
      ),
      array(
        'foxml_file' => "$module_path/newspapers_pageCModel.xml",
        'pid' => 'newspapers:pageCModel',
        'dsid' => NULL,
        'datastream_file' => NULL,
        'dsversion' => NULL,
      ),
      array(
        'foxml_file' => "$module_path/newspapers_viewerSdep-issueCModel.xml",
        'pid' => 'newspapers:viewerSdep-issueCModel',
        'dsid' => NULL,
        'datastream_file' => NULL,
        'dsversion' => NULL,
      ),
      array(
        'foxml_file' => "$module_path/newspapers_viewerSdep-pageCModel.xml",
        'pid' => 'newspapers:viewerSdep-pageCModel',
        'dsid' => NULL,
        'datastream_file' => NULL,
        'dsversion' => NULL,
      ),
    ),
  );
}