Review Comment:
# outline
This paper outlines Ninai/Udiron, a natural language generation system, designed to generate text from abstract representations, based on Abstract Wikipedia.
Specifically, the proposed system consists of two subsystems:
* Ninai, which combines abstract concepts, creates a consolidated abstract representation, and processes it into a syntax tree.
* Udiron, which converts the syntax trees to natural language text. Udiron is in principle capable of generating text in multiple languages, in accordance with the overarching goal of Abstract Wikipedia.
The author describes a number of conceptual, linguistic, and technical choices that should be taken into account by a system like Ninai/Udiron.
# strengths
* The Abstract Wikipedia project is very interesting, and the proposed systems present material steps towards realising the potential of the idea behind Abstract Wikipedia.
* The submission includes a URL to the implementation of Ninai/Udiron, open-sourced and accessible to the community.
# weaknesses
* While I understand that this is a paper submitted as a "Tools and Systems report", a more elaborate background section would be immensely helpful to the interested reader. Specifically, it is not entirely clear why the proposed abstract representation is chosen, what are its advantages and disadvantages, and how it compares to other abstract representations, like, for example a grounded to wikidata Abstract Meaning Representation.
* The description of the systems is superficial, and at times, can be confusing. Specifically,
* it is not clear what parts of the description are conceptual abstractions and what parts are technical/implementation abstractions. While both can be important for readers to understand the inner workings of Ninai/Udiron, the latter are less important, since there can be potentially multiple implementations of the same concepts.
* the state of the project is not very clear. While the author provides a URL to a (current) implementation of Ninai/Udiron, based on the paper text, it is not very easy for readers to identify which parts of this project are implemented, tested, stable, and ready to be used. I understand that parts of the implementation might depend on external factors, but a clear description of the current state of the project would be really useful to the interested reader.
* to my mind, some examples would make the description of Ninai/Udiron much stronger than it currently is. Concrete examples would make subsections of Section 3 much clearer. The same holds for the example of Figure 4; not all details of its relationship with Table 1 are clear. On a related note, the linked implementation seems to have some examples; it would be great if some of those could be used in the paper.
* a clearer version of Figure 3 might help make some of the modules and the relationship between each other more apparent to the reader.
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