@InProceedings{HPlan2019paper2,
  author    = {Daniel H\"{o}ller and Gregor Behnke and Pascal Bercher and Susanne Biundo and Humbert Fiorino Fiorino and Damien Pellier, and Ron Alford},
  title     = {HDDL -- A Language to Describe Hierarchical Planning Problems},
  booktitle = {Proceedings of the 2nd ICAPS Workshop on Hierarchical Planning (HPlan 2019)},
  year      = {2019},
  pages     = {6--14},
  abstract  = {The research in hierarchical planning has made considerable progress in the last few years. Many recent systems do not rely on hand-tailored advice anymore to find solutions, but are supposed to be domain-independent systems that come with sophisticated solving techniques. In principle, this development would make the comparison between systems easier (because the domains are not tailored to a single system anymore) and -- much more important – also the integration into other systems, because the modeling process is less tedious (due to the lack of advice) and there is no (or less) commitment to a certain planning system the model is created for. However, these advantages are destroyed by the lack of a common input language and feature set supported by the different systems. In this paper, we propose an extension to PDDL, the description language used in non-hierarchical planning, to the needs of hierarchical planning systems. We restrict our language to a basic feature set shared by many recent systems, give an extension of PDDL’s EBNF syntax definition, and discuss our extensions, especially with respect to planner-specific input languages from related work.},
  url_paper = {https://openreview.net/pdf?id=HJeT8HBbt4},
  note      = {A follow-up paper was later accepted at AAAI 2020.}
}

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