Index.php

<?php
class ZendDbSchema_Validate_Db_Schema_Table_Mysql_Column
    extends ZendDbSchema_Validate_Db_Schema_Chain
{
    public function __construct()
    {
        $this->addValidator(new ZendDbSchema_Validate_Db_Schema_Table_Mysql_Index_Name())
             ->addValidator(new ZendDbSchema_Validate_Db_Schema_Table_Mysql_Index_Type());
    }
}