The temperature of a fluid stream, the tensile strength of a bolt, the length of a pipeline, the colour of a surface coating, the familiarity of a specialist with a modification procedure, the quality of a window of being open or closed.
Qualities are in general subject to change over the lifetime of the bearer. The main IDO device for representing quality changes is through 'datum' individuals: see lis:qualityQuantifiedAs.
Qualities should only be used for root properties such as voltage, pressure, etc. Where there are variants such as nominal, rated, actual voltage, modellers should use lis:Quality for voltage and use a subclass of lis:QualityDatum for the moderator ("nominal", etc.)
