ASN.1 - Interface design language

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...

ASN.1 Wikipedia page
There are at least 0 ASN.1 repos on GitHub
ASN.1 first developed in International Telecommunication Union and International Electrotechnical Commission
file extensions for ASN.1 include asn and asn1
ASN.1 on HOPL
CodeMirror package for syntax highlighting ASN.1
GitHub supports syntax highlighting for ASN.1
See also: (5 related languages)Protocol Buffers, Thrift, ASCII, JSON, XML

Example from the web:

FooProtocol DEFINITIONS ::= BEGIN

    FooQuestion ::= SEQUENCE {
        trackingNumber INTEGER,
        question       IA5String
    }

    FooAnswer ::= SEQUENCE {
        questionNumber INTEGER,
        answer         BOOLEAN
    }

END

Example from Linguist:

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

Example from Wikipedia:

<FooQuestion>
    <trackingNumber>5</trackingNumber>
    <question>Anybody there?</question>
</FooQuestion>