drupal_install_schema not creating schema or not being called in .install

I trying to learn to write modules that have their own data tables. Initially the module had hard coded values, I disabled the module added the following .install file, and reenabled the module, but it doesn't seem to create the table. Am I misunderstanding the behavior of the system?

// set up tables for dac_appmenu

function dac_appmenu_install() {
  drupal_install_schema('dac_appmenu');
}

function dac_appmenu_uninstall() {
  drupal_uninstall_schema('dac_appmenu');
}

/**
 * Implementation of hook_schemea
 */
function dac_appmenu_schema() {
        $schema['dac_appmenu_apps'] = array(
                'description' => t('Table to list applications'),
                'fields' => array(
                        'dacappid' => array(
                                'description' => t('Primary key for this table'),
                                'type' => 'serial',
                                'unsigned' => TRUE,
                                'not null' => TRUE),
                        'dacappname' => array(
                                'description' => t('Human readable application name'),
                                'type' => 'varchar',
                                'length' => 120,
                                'not null' => TRUE,
                                'default' => ''),
                        'dacappurl' => array(
                                'description' => t('url or application'),
                                'type' => 'varchar',
                                'length' => 200,
                                'not null' => TRUE,
                                'default' => ''),
                        'dacappzone' => array(
                                'description' => t('security zone for application'),
                                'type' => 'varchar',
                                'length' => 30,
                                'not null' => TRUE,
                                'default' => '')
                        ),
                'primary key' => array('dacappid')
        );

        return $schema;
}

(in the actual file, the closing php tag is omitted.)

thanks,

Geof