/usr/lib/swipl/library/http/html_write.pl
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 html_quoted(Text)// is det
Quote the value for normal (CDATA) text. Note that text appearing in the document structure is normally quoted using these rules. I.e. the following emits properly quoted bold text regardless of the content of Text: 
        html(b(Text))
To be done
- Assumes UTF-8 encoding of the output.