Technical Implementation
In 2009, Ziegler and Knopf published version 1.0 of the Rex format. They used anonymized analyses of productive CMS installations and presented their results on different occasions. For version 1.1 the schema definition was updated and the analysis program was further developed. By now, several CMS-specific implementations of key figures exist in individual systems.
The structure of the REx format is defined through two XML schemas (XSD files). Depending on the contained information the REx format is divided into two levels. On a basic level, a CMS can export reuse data as a report in the form of REx level 1. More detailed analyses and visualizations can then be created in cooperation as REx level 2.