ASN.1 is an interface design language created in 1984.
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Abstract Syntax Notation One (ASN.1) is an interface description language for defining data structures that can be serialized and deserialized in a standard, cross-platform way. It's broadly used in telecommunications and computer networking, and especially in cryptography. Protocol developers define data structures in ASN.1 modules, which are generally a section of a broader standards document written in the ASN.1 language. Read more on Wikipedia...
FooProtocol DEFINITIONS ::= BEGIN
FooQuestion ::= SEQUENCE {
trackingNumber INTEGER,
question IA5String
}
FooAnswer ::= SEQUENCE {
questionNumber INTEGER,
answer BOOLEAN
}
END
MyShopPurchaseOrders DEFINITIONS AUTOMATIC TAGS ::= BEGIN
PurchaseOrder ::= SEQUENCE {
dateOfOrder DATE,
customer CustomerInfo,
items ListOfItems
}
CustomerInfo ::= SEQUENCE {
companyName VisibleString (SIZE (3..50)),
billingAddress Address,
contactPhone NumericString (SIZE (7..12))
}
Address::= SEQUENCE {
street VisibleString (SIZE (5 .. 50)) OPTIONAL,
city VisibleString (SIZE (2..30)),
state VisibleString (SIZE(2) ^ FROM ("A".."Z")),
zipCode NumericString (SIZE(5 | 9))
}
ListOfItems ::= SEQUENCE (SIZE (1..100)) OF Item
Item ::= SEQUENCE {
itemCode INTEGER (1..99999),
color VisibleString ("Black" | "Blue" | "Brown"),
power INTEGER (110 | 220),
deliveryTime INTEGER (8..12 | 14..19),
quantity INTEGER (1..1000),
unitPrice REAL (1.00 .. 9999.00),
isTaxable BOOLEAN
}
END
<FooQuestion>
<trackingNumber>5</trackingNumber>
<question>Anybody there?</question>
</FooQuestion>