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plugin produces aXML code,
   parser takes that aXML code and produces HTML code,
      browser takes that HTML code and produces text.

text_to_aXML: The "escape" function I posted, renamed for clarity.
text_to_html: Converts & to &amp, < to &lt, etc.
...
   my $text = ...;
   return text_to_aXML(text_to_html($text));
}