ratio
A ratio literal consisting of two quantity values separated by a colon. Represents a proportional relationship between two measured quantities, such as 1 'mg' : 2 'mL'.
Examples
Dosage ratio
1 'mg' : 2 'mL'
Rate ratio
5 'mg' : 100 'mL'
Used as a literal value
define "DosageRatio": 1 'mg' : 2 'mL'
EBNF
ratio : quantity ':' quantity ;