New ask Hacker News story: Ask HN: Is there prior art for this rich text data model?

Ask HN: Is there prior art for this rich text data model?
2 by chrisecker | 1 comments on Hacker News.
I've built a rich text data model for a desktop word processor in Python, based on a persistent balanced n-ary tree with cached weights for O(log n) index translation. The document model uses only four element types: Text, Container, Single, and Group — where Group is purely structural (for balancing) and has no semantic meaning in the document. Individual elements are immutable; insert and takeout return new trees rather than mutating the old one. This guarantees that old indices remain valid as long as the old tree exists. I'm aware of Ropes, Finger Trees, and ProseMirror's flat index model. Is there prior art I should know about — specifically for rich text document models with these properties?

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