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Mermaid is a “Markdown for diagrams” that seems to use a more semantic markup instead of ASCII art: https://github.com/knsv/mermaid

Would probably work nice as a plugin for a wiki.

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I've been using Mermaid with MediaWiki and it has a lot of promise. Since Mermaid lets me generate diagrams from text and MediaWiki lets me store and modify structured data, I can have MediaWiki pass Mermaid data to generate graphs/diagrams that stay up-to-date as the wiki changes.

I would like to see Mermaid be able to group sibling nodes[0] though, once I can do that, I can autocreate really nice organizational charts :)

[0] https://github.com/knsv/mermaid/issues/637

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