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. 2015 Jun 1;6:26. doi: 10.1186/s13326-015-0020-6

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© Christen et al.; licensee BioMed Central. 2015

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. 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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Three-layered architecture of REX. The figure shows the architecture of REX consisting of three layers: (1) knowledge base layer, (2) server layer, (3) presentation layer.