Suppose a company owns several sales outlets linked to a central warehouse where stocks are maintained and deliveries start from. The company requires that its protocol have the following features:
- the orders are collected locally at the sales outlets ;
- they are transmitted to the warehouse, where the delivery procedure should be managed ;
- an account of the delivery must be sent back to the sales outlets for following through the client's order.
This protocol can be specified with the two following ASN.1 modules:
-- Module sample (sample:01/2014)
Module-order
DEFINITIONS
AUTOMATIC TAGS ::=
BEGIN
Order ::=
SEQUENCE {header
Order-header,
items
SEQUENCE
OF
Order-line
}
Order-header ::=
SEQUENCE {
number
Order-number,
date
Date,
client
Client,
payment
Payment-method
}
Order-number ::=
NumericString(SIZE
(12))
Date ::=
NumericString(SIZE
(8)) -- MMDDYYYY
Client ::=
SEQUENCE {
name
PrintableString(SIZE
(1..20)),
street
PrintableString(SIZE
(1..50))
OPTIONAL,
postcode
NumericString(SIZE
(5)),
town
PrintableString(SIZE
(1..30)),
country
PrintableString(SIZE
(1..20))
DEFAULT
default-country
}
default-country
PrintableString ::= "France"
Payment-method ::=
CHOICE {
check
NumericString(SIZE
(15)),
credit-card
Credit-card,
cash
NULL
}
Credit-card ::=
SEQUENCE {
type
Card-type,
number
NumericString(SIZE
(20)),
expiry-date
NumericString(SIZE
(6))-- MMYYYY --
}
Card-type ::=
ENUMERATED {
cb(0), visa(1), eurocard(2), diners(3), american-express(4)}
Order-line ::=
SEQUENCE {
item-code
Item-code,
label
Label,
quantity
Quantity,
price
Cents
}
Item-code ::=
NumericString(SIZE
(7))
Label ::=
PrintableString(SIZE
(1..30))
Quantity ::=
CHOICE {
unites
INTEGER,
millimetres
INTEGER,
milligrammes
INTEGER
}
Cents ::=
INTEGER
Delivery-report ::=
SEQUENCE {
order-code
Order-number,
delivery
SEQUENCE
OF
Delivery-line
}
Delivery-line ::=
SEQUENCE {item
Item-code,
quantity
Quantity
}
END
Protocol
DEFINITIONS
AUTOMATIC TAGS ::=
BEGIN
IMPORTS
Order, Delivery-report, Item-code, Quantity, Order-number
FROM Module-order;
PDU ::=
CHOICE {
question
CHOICE {question1
Order,
question2
Item-code,
question3
Order-number,
...},
answer
CHOICE {answer1
Delivery-report,
answer2
Quantity,
answer3
Delivery-report,
...}
}
END
