-
-local node_type = node.type
-local node_new = node.new
-local node_prev = node.prev
-local node_next = node.next
-local has_attr = node.has_attribute
-local node_insert_before = node.insert_before
-local node_insert_after = node.insert_after
-local node_hpack = node.hpack
-
-local id_penalty = node.id('penalty')
-local id_glyph = node.id('glyph')
-local id_glue_spec = node.id('glue_spec')
-local id_glue = node.id('glue')
-local id_kern = node.id('kern')
-local id_hlist = node.id('hlist')
-local id_vlist = node.id('vlist')
-local id_rule = node.id('rule')
-local id_math = node.id('math')
-local id_whatsit = node.id('whatsit')
-local sid_user = node.subtype('user_defined')
-