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The simple language provides various elementary expressions that return different parts
of a message exchange. For example, the expression, header.timeOfDay
,
would return the contents of a header called timeOfDay
from the incoming
message. You can also construct predicates by testing expressions for equality. For example,
the predicate, ${header.timeOfDay} == '14:30'
, tests whether the
timeOfDay
header in the incoming message is equal to 14:30
.