+NODE_SEL := [NODE_SEL#](DIR|CYCLE_DIR|PATH|last|
+ older|newer|focused|pointed|
+ biggest|<node_id>)[.[!]focused][.[!]automatic][.[!]local][.[!]active]
+ [.[!]leaf][.[!]window][.[!]STATE][.[!]FLAG][.[!]LAYER]
+ [.[!]same_class][.[!]descendant_of][.[!]ancestor_of]