root ::= ws "{" ws id-field "," ws kind-field "," ws items-field "," ws alt-field "," ws flags-field "," ws meta-field "," ws priority-field ws "}" ws

id-field ::= "\"id\"" ws ":" ws uuid
kind-field ::= "\"kind\"" ws ":" ws kind
items-field ::= "\"items\"" ws ":" ws items
alt-field ::= "\"alt\"" ws ":" ws alt
flags-field ::= "\"flags\"" ws ":" ws flags
meta-field ::= "\"meta\"" ws ":" ws meta
priority-field ::= "\"priority\"" ws ":" ws int

kind ::= "\"order\"" | "\"invoice\"" | "\"shipment\""
status ::= "\"new\"" | "\"backorder\"" | "\"shipped\""
flag ::= "\"fragile\"" | "\"gift\"" | "\"priority\"" | "\"insured\""
source ::= "\"api\"" | "\"batch\"" | "\"import\""

items ::= "[" ws item ( "," ws item )? ( "," ws item )? ws "]"
flags ::= "[" ws "]" | "[" ws flag ( "," ws flag )? ( "," ws flag )? ( "," ws flag )? ws "]"

item ::= "{" ws item-sku "," ws item-qty "," ws item-status "," ws item-notes ws "}"
item-sku ::= "\"sku\"" ws ":" ws string
item-qty ::= "\"qty\"" ws ":" ws int
item-status ::= "\"status\"" ws ":" ws status
item-notes ::= "\"notes\"" ws ":" ws string

meta ::= "{" ws meta-created "," ws meta-source "," ws meta-ip ws "}"
meta-created ::= "\"created\"" ws ":" ws date-time
meta-source ::= "\"source\"" ws ":" ws source
meta-ip ::= "\"ip\"" ws ":" ws ipv4

alt ::= string | int | "null"

uuid ::= "\"" hex hex hex hex hex hex hex hex "-" hex hex hex hex "-" hex hex hex hex "-" hex hex hex hex "-" hex hex hex hex hex hex hex hex hex hex hex hex "\""
date-time ::= "\"" digit digit digit digit "-" digit digit "-" digit digit "T" digit digit ":" digit digit ":" digit digit ( "Z" | ( "+" | "-" ) digit digit ":" digit digit ) "\""
ipv4 ::= "\"" digit+ "." digit+ "." digit+ "." digit+ "\""

string ::= "\"" characters "\""
characters ::= character*
character ::= [^"\\] | "\\" escape
escape ::= ["\\bfnrt]

int ::= "-"? digit+
digit ::= [0-9]
hex ::= [0-9a-fA-F]

ws ::= [ \t\n\r]*