sgmlsasp translates the standard input using the specification in replacement_file... and writes the
result to the standard output. The standard input must be in the format output by sgmls. Each
replacement file must be in the format of an Amsterdam SGML parser (ASP) replacement file; this format is
described in the ASP documentation. Duplicate replacements are silently ignored. The -n option disables
upper-case substitution (folding) for names in replacement files; this option should be used with
concrete syntaxes that do not specify upper-case substitution for general names (that is, names that are
not entity names).