WordPress at a glance
action is not described

parse_tax_query action-hook . WP 3.7.0

Fires after taxonomy-related query vars have been parsed.

Usage

add_action( 'parse_tax_query', 'action_function_name_9052' );
function action_function_name_9052( $this ){
	// action...
}
$this(WP_Query)
The WP_Query instance.

Where the hook is called

WP_Query::parse_tax_query()
parse_tax_query
wp-includes/class-wp-query.php 1235
do_action( 'parse_tax_query', $this );

Where the hook is used (in WP core)

Does not used.