# `Diffo.Provider.Instance.Extension`
[🔗](https://github.com/diffo-dev/diffo/blob/v0.9.0/lib/diffo/provider/components/instance/extension.ex#L5)

Marker extension — identifies BaseInstance-derived resources. DSL is in `Diffo.Provider.Extension`.

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