This paper defines the syntax and semantics of the input language of the ASP grounder GRINGO. The definition covers several constructs that were not discussed in earlier work on the semantics of that language, including intervals, pools, division of integers, aggregates with non-numeric values, and lparse-style aggregate expressions. The definition is abstract in the sense that it disregards some details related to representing programs by strings of ASCII characters. It serves as a specification for GRINGO from Version 4.5 on.

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Theory and Practice of Logic Programming, Vol. 15, 4-5 (2015).

@article{gebser:unpub14, title={Abstract Gringo}, author={Martin Gebser and Amelia Harrison and Roland Kaminski and Vladimir Lifschitz and Torsten Schaub}, booktitle={Proceedings of 31st International Conference on Logic Programming, ICLP}, volume={15}, journal={Theory and Practice of Logic Programming}, number={4-5}, url="http://www.cs.utexas.edu/users/ai-lab?AG", year={2015} }