Sequence Start Event
class SequenceStartEvent @JvmOverloads constructor(val anchor: Anchor?, val tag: String?, val implicit: Boolean, val flowStyle: FlowStyle, val startMark: Mark? = null, val endMark: Mark? = null) : CollectionStartEvent
Marks the beginning of a sequence node.
This event is followed by the elements contained in the sequence, and a SequenceEndEvent.