file       = _{ SOI ~ object ~ EOI }
WHITESPACE = _{ " " | "\t" | "\r" | "\n" }
node_value =  { (!"]" ~ ANY)+ }
node_item  = _{ "[" ~ node_value? ~ "]" }
node       =  { ";"* ~ node_type ~ node_item+ }
node_type  =  { LETTER+ }
value      = _{ object | node }
object     = {
    "(" ~ ")" |
    "(" ~ value* ~ ")"
}