# `SBoM.CycloneDX.V17.ExternalReference`
[🔗](https://github.com/erlef/mix_sbom/blob/v0.10.0/lib/sbom/cyclonedx/v17/external_reference.pb.ex#L1)

External references provide a way to document systems, sites, and information that may be relevant but are not included with the BOM. They may also establish specific relationships within or external to the BOM.

# `t`

```elixir
@type t() :: %SBoM.CycloneDX.V17.ExternalReference{
  __unknown_fields__: [Protobuf.unknown_field()],
  comment: String.t() | nil,
  hashes: [SBoM.CycloneDX.V17.Hash.t()],
  properties: [SBoM.CycloneDX.V17.Property.t()],
  type: SBoM.CycloneDX.V17.ExternalReferenceType.t(),
  url: String.t()
}
```

---

*Consult [api-reference.md](api-reference.md) for complete listing*