Jeffrey Kintscher <websur...@surf2c.net> added the comment:

Which characters would you escape in a processing instruction? The XML spec 
says not to escape '<' and '&', but doesn't say what should be escaped. It 
seems to me that escaping '?' when followed by '>' should be sufficient since 
the character sequence "?>" is the closing delimiter.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue33303>
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