> ## Documentation Index
> Fetch the complete documentation index at: https://docs.fiddler.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# SpanReference

> A span identified by trace and span ID.

## Attributes

<ResponseField name="trace_id">
  ID of the trace containing the span.
</ResponseField>

<ResponseField name="span_id">
  ID of the span within the trace.
</ResponseField>