For entertainment, there has been MVR - My Virtual Rig - specification. The My Virtual Rig file format allows programs to share data and geometry of a scene for the entertainment industry.
GDTF has been created to be able to describe static or moving heads, trusses, distro boxes, lasers... in an open, license free yet DIN Spec certified format.
There are xsd and schematron schemas [1], see docs generated from the xsd [2]. The GDTF editor on https://gdtf-share.com [3] also has deeper internal validation some of the data logic.
BlenderDMX is an open source, Blender based tool to visualize DMX lights. The lights are defined via GDTF (an open format to describe these devices). It is exciting to see a free, GPL-3.0 licensed visualizer. It still leaves much to be desired, but it seems to be a good starting point for an open source solution to DMX visualization.
5.1 also includes improved DMX Plugin for proper lighting shows, the plugin adds support for DMX over Ethernet (sACN, Art-Net) and allows lighting fixtures based on devices imported via GDTF [1], [2].
Official repo: [1]
Current Spec: [2]
WIP for DIN Spec release: [3]
[1] https://github.com/mvrdevelopment/spec/
[2] https://github.com/mvrdevelopment/spec/blob/main/mvr-spec.md
[3] https://github.com/mvrdevelopment/spec/pull/153