public function createPostType()
{
   register_post_type('ta_single', array(
      'rewrite'       => array('slug' => 'base/%name_of_the_taxonomy%/', 'with_front' => false),
   ));

   register_taxonomy('ta_category', 'ta_single', array(
      'hierarchical'     => true,
      'rewrite'      => array(
         'slug'          => 'base',
     'with_front'=> false,
      ),
      'show_in_nav_menus'  => true,
   ));
}