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. 2017 Aug 1;8:26. doi: 10.1186/s13326-017-0133-1

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© The Author(s) 2017

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver(http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Modeling of the datamodel ontology. Excerpt of ontology classes and the relations between these. The classes on the left of the diagram are kinds of FormStructure, such as Question, which generate instances of the corresponding Data classes on the right (e.g., an answer to a question generates an instance of Observation)