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PSGML can not validate an SGML document (see below what it can
and can’t do). If you have a validating SGML parser, like
sgmls, you can run the parser on your file with the
command C-c C-v (sgml-validate).
Some variables control this function:
The shell command to validate an SGML document.
This is a format control string that by default should contain two
%s conversion specifications: the first will be replaced by the
value of sgml-declaration (or the empty string, if nil); the
second will be replaced by the current buffer’s file name (or the
empty string, if nil).
If sgml-validate-files is non-nil, the format string should contain
one %s conversion specification for each element of its result.
If sgml-validate-command is a list, then every element should be a string. The strings will be tried in order and ‘%’-sequences in the string will be replaced according to the list below, if the string contains ‘%’-sequences with no replacement value the next string will be tried.
%bmeans the visited file of the current buffer
%smeans the SGML declaration specified in the sgml-declaration variable
%dmeans the file containing the DOCTYPE declaration, if not in the buffer
The default value is nsgmls -s %s %s.
If non-nil, a function of no arguments that returns a list of
file names. These file names will serve as the arguments to the
sgml-validate-command format control string instead of
the defaults.
The name of the SGML declaration file.
If non-nil, C-c C-v (sgml-validate) will ask about
saving modified buffers before running the validate command.
The default value is t.
The built-in parser can find some markup errors. The command C-c
C-o (sgml-next-trouble-spot) is the best way to use the built-in
parser for this. To check the whole file go to the beginning of the
buffer and use C-c C-o.
Some of the markup errors not found are:
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