semantic-conventions/docs/attributes-registry/opentracing.md

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# OpenTracing
## OpenTracing Attributes
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| Attribute | Type | Description | Examples | Stability |
|---|---|---|---|---|
| `opentracing.ref_type` | string | Parent-child Reference type [1] | `child_of` | ![Experimental](https://img.shields.io/badge/-experimental-blue) |
**[1]:** The causal relationship between a child Span and a parent Span.
`opentracing.ref_type` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.
| Value | Description | Stability |
|---|---|---|
| `child_of` | The parent Span depends on the child Span in some capacity | ![Experimental](https://img.shields.io/badge/-experimental-blue) |
| `follows_from` | The parent Span doesn't depend in any way on the result of the child Span | ![Experimental](https://img.shields.io/badge/-experimental-blue) |
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