---
name: "PPI::Structure::Unknown"
section: "3pm"
platform: "linux"
package: "perl-ppi"
version: "1.291-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/PPI::Structure::Unknown"
---

# PPI::Structure::Unknown(3pm)

An unknown or unresolved brace structure

## NAME

PPI::Structure::Unknown - An unknown or unresolved brace structure

## INHERITANCE

```
  PPI::Structure::Unknown
  isa PPI::Structure
      isa PPI::Node
          isa PPI::Element
```

## DESCRIPTION

`"PPI::Structure::Unknown"` is class for braces whose type is unknown, or temporarily unknown.

It primarily exists temporarily inside the lexer. Although some types of braces can be determined immediately at opening, there are a number of different brace types that can only be correctly identified after the braces are closed.

A structure is typed as unknown during this period it is indeterminate.

A `"PPI::Structure::Unknown"` object should not **ever** make it out of the lexer without being converted to its final type. Any time you encounter this class in a PDOM tree it should be considered a bug and reported accordingly.

## METHODS

`"PPI::Structure::Unknown"` has no methods beyond those provided by the standard PPI::Structure, PPI::Node and PPI::Element methods.

## SUPPORT

See the support section in the main module.

## AUTHOR

Adam Kennedy \<adamk@cpan.org\>

## COPYRIGHT

Copyright 2001 - 2011 Adam Kennedy.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

The full text of the license can be found in the LICENSE file included with this module.