GML - Programming language

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GML, aka IBM Generalised Markup Language, is a programming language created in 1969 by Charles Goldfarb and Edward Mosher and Raymond Lorie.

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Wikipedia

Generalized Markup Language (GML) is a set of macros that implement intent-based (procedural) markup tags for the IBM text formatter, SCRIPT. SCRIPT/VS is the main component of IBM's Document Composition Facility (DCF). A starter set of tags in GML is provided with the DCF product.. Read more on Wikipedia...

Tags: programming language
Early development of GML happened in IBM
GML on HOPL
ANTLR grammar for GML
See also: (4 related languages) SCRIPT markup, SGML, XML, Information Presentation Facility

Example from hello-world:

draw_text(1, 1, "Hello World");

Language features

Feature	Supported	Example	Token
Strings	✓	"Hello world"	"
Print() Debugging	✓		draw_text