This brochure specifies principles for establishing the use of units in a digitalised communication of machine-readable data. These principles are the basis for all applications that transfer or require measurement data according to the specifications of the Système International d’Unités (SI). Fundamental principles for a harmonised, unambiguous, easy-to-understand and safe digital communication of metrological data are specified for real quantities and quantities related to constants. The principles consider a broad scope of requirements from a metrological and information and communications technology (ICT) point of view. The version of the metadata model which is described in this document is D-SI v1.3.0. This brochure is deliverable D2 of the EURAMET EMPIR project 17IND02 (SmartCom, WP1).

The development of the unified meta data format for the exchange of measurement data in ICT applications and its implementation is part of the research project EMPIR 17IND02 (title: SmartCom). This project has received funding from the EMPIR programme co-financed by the Participating States and from the European Union's Horizon 2020 research and innovation programme.

{"references": ["EMPIR 17IND02 (SmartCom): Website of the research project, https://www.ptb.de/empir2018/smartcom/home/ (accessed November 2019)"]}