type Event struct {
	// Name is the name of this event
	Name string

	// Attributes describe the aspects of the event.
	Attributes []label.KeyValue

	// Time is the time at which this event was recorded.
	Time time.Time
}

type SpanData struct {
	SpanContext  trace.SpanContext
	ParentSpanID trace.SpanID
	SpanKind     trace.SpanKind
	Name         string
	StartTime    time.Time
	// The wall clock time of EndTime will be adjusted to always be offset
	// from StartTime by the duration of the span.
	EndTime                  time.Time
	Attributes               []label.KeyValue
	MessageEvents            []Event
	Links                    []trace.Link
	StatusCode               codes.Code
	StatusMessage            string
	HasRemoteParent          bool
	DroppedAttributeCount    int
	DroppedMessageEventCount int
	DroppedLinkCount         int

	// ChildSpanCount holds the number of child span created for this span.
	ChildSpanCount int

	// Resource contains attributes representing an entity that produced this span.
	Resource *resource.Resource

	// InstrumentationLibrary defines the instrumentation library used to
	// provide instrumentation.
	InstrumentationLibrary instrumentation.Library
}

type SpanExporter interface {
	// ExportSpans exports a batch of SpanData.
	//
	// This function is called synchronously, so there is no concurrency
	// safety requirement. However, due to the synchronous calling pattern,
	// it is critical that all timeouts and cancellations contained in the
	// passed context must be honored.
	//
	// Any retry logic must be contained in this function. The SDK that
	// calls this function will not implement any retry logic. All errors
	// returned by this function are considered unrecoverable and will be
	// reported to a configured error Handler.
	ExportSpans(ctx context.Context, spanData []*SpanData) error
	// Shutdown notifies the exporter of a pending halt to operations. The
	// exporter is expected to preform any cleanup or synchronization it
	// requires while honoring all timeouts and cancellations contained in
	// the passed context.
	Shutdown(ctx context.Context) error
}