YAML Ain't Markup Language, aka YAML Ain't Markup Language, is an actively used metalanguage created in 2001.

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Example code from Linguist:

--- 
name: R Console
fileTypes: []

scopeName: source.r-console
uuid: F629C7F3-823B-4A4C-8EEE-9971490C5710
patterns: 
- name: source.r.embedded.r-console
  begin: "^> "
  beginCaptures: 
    "0": 
      name: punctuation.section.embedded.r-console
  end: \n|\z
  patterns: 
  - include: source.r
keyEquivalent: ^~R

Example code from Wikipedia:

---
example: >
        HTML goes into YAML without modification
message: |

        <blockquote style="font: italic 12pt Times">
        <p>"Three is always greater than two,
           even for large values of two"</p>
        <p>--Author Unknown</p>
        </blockquote>
date: 2007-06-01
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Last updated February 11th, 2019