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., Álvaro.
-It is also possible to safely represent Latin-1 characters in UTF8
-encoding for all output formats.
+Therefore, in the SGML files, we can only use Latin-1 characters. We
+can use UTF8 representations of Latin-1 characters, or HTML entities of
+Latin-1 characters, e.g., Álvaro.
Do not use UTF numeric character escapes (&#nnn;).
+When building the PDF docs, problem characters will appear as warnings.
+
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