Execute a subcommand with input from a file or URI, printing to stdout

XMLStarlet Toolkit: Query, edit, check, convert and transform XML documents.
This command also has documentation about its subcommands, e.g. `xml validate`.
More information: <http://xmlstar.sourceforge.net/docs.php>.
Trick copyright: tl;dr; <https://github.com/tldr-pages/tldr>

xml {{subcommand}} {{options}} {{path/to/input.xml|URI}}

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