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| class-term_names |
<-_arg
to return the nth (1-based) argument of the term-description.
If element <n> of this vector has value <selector>, the
class must define <-<selector> and the nth (1-based) result of object<-_arg
is the result of <-<selector> on the object.
For example, class point
defined class<-term_functor: point and class<-term_vector
vector(x,y). Therefore the term has the form:
point(`point<-x`, `point<-y`)
<-_arg