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# SecExternalItemType.itemTypeAggregate

Indicates a set of certificates or certificates and private keys.

```
case itemTypeAggregate
```

## Discussion

Possible values include [`SecExternalFormat.formatPKCS7`](/documentation/Security/SecExternalFormat/formatPKCS7), [`SecExternalFormat.formatPKCS12`](/documentation/Security/SecExternalFormat/formatPKCS12), or [`SecExternalFormat.formatPEMSequence`](/documentation/Security/SecExternalFormat/formatPEMSequence) formats (see [`SecExternalFormat`](/documentation/Security/SecExternalFormat)).

---

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