postgres/doc/src/sgml

<!-- doc/src/sgml/README.non-ASCII -->

Representation of non-ASCII characters
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Find non-ASCII characters using:

        grep --recursive --color='auto' -P '[\x80-\xFF]' .

Convert to HTML4 named entity (&) escapes
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We support several output formats:

*  html (supports all Unicode characters)
*  man (supports all Unicode characters)
*  pdf (supports only Latin-1 characters)
*  info

While some output formatting tools support all Unicode characters,
others only support Latin-1 characters.  Specifically, the PDF rendering
engine can only display Latin-1 characters;  non-Latin-1 Unicode
characters are displayed as "###".

Therefore, in the SGML files, we only use Latin-1 characters.  We
typically encode these characters as HTML entities, e.g., &Aacute;lvaro.
It is also possible to safely represent Latin-1 characters in UTF8
encoding for all output formats.

Do not use UTF numeric character escapes (&#nnn;).

HTML entities
        official:      http://www.w3.org/TR/html4/sgml/entities.html
        one page:      http://www.zipcon.net/~swhite/docs/computers/browsers/entities_page.html
        other lists:   http://www.zipcon.net/~swhite/docs/computers/browsers/entities.html
                       http://www.zipcon.net/~swhite/docs/computers/browsers/entities_page.html
                       https://en.wikipedia.org/wiki/List_of_XML_and_HTML_character_entity_references