Description #Description

Args can have 3 elements:

$args = array(
    'taxonomies' => array( 'valid', 'taxonomies' ),
    'custom_fields' => array(
        'csv_key' => 'internal_key',
        'csv_key' => array(
            'internal_key' => 'key',
            'default' => 'value'
        )
    ),
    'tax_meta' => array( array( 'tax' => array( 'csv_key' => 'tax_key' ) ),
);