Create several tables witch schema API

Hi people,

I have a doubt about the schema api. I've created a schema with a table called pois. This is the
code:

function pois_schema(){
$schema['pois'] = array(
'description' => t('Datos correspondientes al formulario de insercion de Pois'),
'fields' => array(
'vid' => array(
'type' => 'int',
'unsigned' => TRUE,
'not null' => TRUE,
'default' => 0,
),
'nid' => array(
'type' => 'int',
'unsigned' => TRUE,
'not null' => TRUE,
'default' => 0,
),
'nombre' => array(
'type' => 'varchar',
'not null' => TRUE,
'length' => 50,
'default' => '',
),
'descripcion' => array(
'type' => 'text',
'not null' => TRUE,
),
'longitud' => array(
'type' => 'float',
'unsigned' => FALSE,
'not null' => TRUE,
'default' => 0,
),
'latitud' => array(
'type' => 'float',
'unsigned' => FALSE,
'not null' => TRUE,
'default' => 0,
),
),
'indexes' => array('nid' => array('nid'),),
'primary key' => array('vid'),
);

return $schema;
}

That's ok. But, how can i create a second table? The following code is what i've tried just after the
definition of the 'pois' table:

$schema['pois_cat'] = array(
'description' => t(''),
'fields' => array(
'id' => array(
'type' => 'serial',
//'unsigned' => 'TRUE',
'not null' => 'TRUE',
'default' => 0,
),
'nombre' => array(
'type' => 'varchar',
'not null' => 'TRUE',
'length' => '25',
'default' => '',
),
),
'indexes' => array('id' => array('id'),),
'primary key' => array('id'),
);

Is this the rigth way??? Index and primary key can be the same field????

Thanks to everyone for any help.