Kategorien (IN) nach ID
$tax_query = array( 'relation' => 'OR', array( 'taxonomy' => 'category', 'terms' => array( 'term_ID1', 'term_ID2' ), 'field' => 'term_id', 'operator' => 'IN', 'include_children' => true, ), );
$tax_query = array( 'relation' => 'OR', array( 'taxonomy' => 'category', 'terms' => array( 'term_ID1', 'term_ID2' ), 'field' => 'term_id', 'operator' => 'IN', 'include_children' => true, ), );