Looking at XML::Twig's source, you can apparently pass subroutine references, regular expressions, or plain strings (which can themselves be used in various ways to express different things). Take a look at the _install_cond subroutine.

In reply to Re: XML::Twig how to find a parent's attribute by AppleFritter
in thread XML::Twig how to find a parent's attribute by slugger415

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