tags
$tax_query = array( 'relation' => 'AND', array( 'terms' => array( 'x', 'y', 'z' ), 'field' => 'slug', 'operator' => 'IN', ), );
$tax_query = array( 'relation' => 'AND', array( 'terms' => array( 'x', 'y', 'z' ), 'field' => 'slug', 'operator' => 'IN', ), );