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  $properties['hostname'] = array(

    'label' => t("IP Address"),

    'description' => t("The IP address of the computer the comment was posted from."),

    'schema field' => 'hostname',

  );

  $properties['name'] = array(

    'description' => t("The email address left by the comment author."),

    'getter callback' => 'entity_metadata_comment_get_properties',

    'setter callback' => 'entity_property_verbatim_set',

    'validation callback' => 'valid_email_address',

    'schema field' => 'mail',

  );

  $properties['homepage'] = array(

    'label' => t("Subject"),

    'description' => t("The subject of the comment."),

    'setter callback' => 'entity_property_verbatim_set',

    'sanitize' => 'filter_xss',

    'required' => TRUE,

    'schema field' => 'subject',

    'description' => t("The comment's parent, if comment threading is active."),

    'type' => 'comment',

    'getter callback' => 'entity_metadata_comment_get_properties',

    'schema field' => 'pid',

  );

  $properties['node'] = array(

    // it is an integer, so we follow the schema definition.

    'type' => 'integer',

    'options list' => 'entity_metadata_status_options_list',

    'schema field' => 'status',

  );

  return $info;