See JetBrains MPS: https://www.jetbrains.com/mps/
The "Projectional Editor" might be the kind of thing you're talking about. The meta language is stored as syntax trees rather than text and can be rendered in different ways.
The "Projectional Editor" might be the kind of thing you're talking about. The meta language is stored as syntax trees rather than text and can be rendered in different ways.
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