10. Substitution

Any expression, variable, or constant of one of the aforementioned data types, when enclosed by parentheses, constitutes a substitution statement. Example:

(eltype="Q4.S.MITC") (t1=2.5) (t2=1.5)
eltype (eltype) mid 1 thickness (t1+t2) eccent (t2/2)

is equivalent to

eltype "Q4.S.MITC" mid 1 thickness 4. eccent .75