Zend FR

set_include_path('.' 
  . PATH_SEPARATOR . APP_PATH_ROOT . 'library' 
  . PATH_SEPARATOR . APP_PATH_ROOT . 'application/models' 
  . PATH_SEPARATOR . APP_PATH_ROOT . 'application/controllers' 
  . PATH_SEPARATOR . get_include_path()
);

<?php
class CustomerType extends MyBaseModel
{
  protected $_name = "customertypes";

  public function getName ()
  {
    return $this->_name;
  }
}
?>

<?php
require_once ('Zend/Db/Table.php');
class MyBaseModel extends Zend_Db_Table
{
  protected $_schema = "workflow";
  protected $_name = "";

  public function getName ()
  {
    return $this->_name;
  }
}
?>