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


  isa PPI::Structure
      isa PPI::Node
          isa PPI::Element


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.


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


See the support section in the main module.


Adam Kennedy <>


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.