Many source instances maps to one target instance

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The Example below shows how to map many source instances to one target. Each combination of the source instance types source::sEntA, source::sEntB, and source::sEntB that evaluates the WHEN clause to TRUE will implicitly create a map instance of type target::targetEntity.
 
MAP many_to_one FOR t_e:target::targetEntity;
FROM (s_eA:source::sEntA, s_eB:source::sEntB, s_eC:source::sEntC)
WHEN ( . . .);
BEGIN_MAP
 (* Attribute mapping *)
 . . .
END_MAP;