SYSML2 — Add capability to specify accuracy, uncertainty or tolerance for numerical values

The SysML v2 RFP included Requirement PRP 1.15 “Probabilistic Value Distributions", which stated:

Proposals for SysML v2 shall include a capability to represent the value of a quantity with a probabilistic value distribution, including an extensible mechanism to detail the kind of distribution, i.e. the probability density function for continuous random variables, or the probability mass function for discrete random variables.

This requirement was not satisfied in the SysML specification as submitted. A capability should be added that covers this requirement. It should at least be possible to represent a numerical value as a symmetric or asymmetric accuracy, uncertainty or tolerance, with a uniform (i.e., rectangular) distribution.