Major Description
Sequence (1)
Sequence is a syntactic operator to ease the definition of simple flows. Since the vast majority of operators are single input operators, sequence allows one to define a 1:1:1...1 flow without having to specifically define input and definition references. All elements beyond the first element in a sequence must be single input operators. The first element must either be a source operator or a single input operator. The last element of a sequence will can be a sink. The sequence will be a sink if and only if the last element of the sequence is a sink.
{ @id: <opref>, op: “sequence”, input: <input>, do: [ <operator>, <operator>, ... <operator> ] }