The word "valid" in XML

David Megginson ak117 at
Thu Jan 1 22:18:08 GMT 1998

Sean Mc Grath writes:

 > As far as I know "valid" has no SGML genesis. Does anyone know
 > where it came from?

An SGML parser can be "validating" or "non-validating" --
non-validating parsers are not required to report any errors, but they
must still read the DATA and produce the same output as validating

XML does not allow conforming, non-validating parsers in the SGML
sense (any parser without full error reporting is non-conforming), but
the PR has used the term to mean something like "a DTD-driven parser
with additional error-reporting requirements."

All the best,


David Megginson                 ak117 at
Microstar Software Ltd.         dmeggins at

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