---
title: SecExternalFormat.formatPEMSequence
framework: security
role: symbol
role_heading: Case
path: security/secexternalformat/formatpemsequence
---

# SecExternalFormat.formatPEMSequence

Sequence of certificates and keys with PEM armor. PEM armor refers to a way of expressing binary data as an ASCII string so that it can be transferred over text-only channels such as email. This is the default format for multiple items.

## Declaration

```swift
case formatPEMSequence
```