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Expressing quantity values using the data models of the SI Reference Point #104

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@Crparedes

The SIRP is endorsed as the unit representation system for the digital products of the BIPM: mises en pratique, the KCDB and the JCTLM database (Decision CIPM/112-12 (2023)). Additionally, the updated grand vision of the CIPM for the SI Digital Framework states that its core layer should include a metadata model for quantity values and uncertainties. However, so far there is no BIPM-sanctioned exchange format for representing this information.

May the SIRP be the place to define the data model for this?

The BIPM-sanctioned data model will soon be required for communicating information, for example, in the CCT APIs for reference temperature scales and the mise en pratique of the Kelvin, for CMC entries, in the data model of key comparisons, and potentially among other reference datasets, like the values of the Recommended values of standard frequencies and mises en pratique for other CCs.

I argue that the SIRP could be a good place to define this data model because it contains the knowledge of the SI Brochure, and these specific topics are dealt with in sections 5.4.1 and 5.4.5 of the 9th edition v4.01 (Value and numerical value of a quantity [...] and expressing the measurement uncertainty in the value of a quantity, respectively).

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