[racket] Help with sockets.

From: antoine (antoine.brand at sfr.fr)
Date: Thu May 1 07:21:33 EDT 2014

http://www.w3.org/TR/xml/#sec-cdata-sect
http://www.w3.org/TR/xml/#NT-Char

Skimming the documentation, CDATA didn't help at all, nor escaping
http://www.w3.org/TR/xml/#dt-charref.

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