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AMR: https://github.com/nschneid/amr-tutorial

UCCA: https://aclanthology.org/P13-1023.pdf

And yeah, you could consider UMR an improved version of AMR. AMR is often lampooned with the false name "American Meaning Representation", referring to its unapologetic focus on English only. UMR tries to undo this sin and has a lot of the same people behind it, as well as some new features such as document-level context.

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Would you be willing to add those references to https://meta.wikimedia.org/wiki/Abstract_Wikipedia/Related_a... (creating a new section for UMR) and perhaps https://meta.wikimedia.org/wiki/Abstract_Wikipedia/Related_a... if you're aware of any references that talk about "creating complex, non-trivial text starting from an abstract meaning representation"? That would be the best way of making this discussion useful for what Wikipedia is apparently trying to do.

It's been a while since I worked with any of them so it'd take some review form me to even write a blurb confidently. Sorry! On your latter point though, NLG from AMR is a topic that's been studied since its inception. See the AMR bibliography[1] and CTRL+F "generat".

[1]: https://nert-nlp.github.io/AMR-Bibliography/

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