Online validation service available at
mod_validator is an Apache module to validate markup.
It now offers a choice of parsers:
OpenSP, the library that
powers services such as Page Valet, Code Valet,
the WDG Validator
and the W3C Validator.
- Xerces, the Apache Group's
validating XML parser, used for WebÞing's older XML Validation
Compared to the W3C Validator it offers several advantages:
- Features: better and more complete XML support offered by Xerces
- Performance - no CGI overhead
- Performance - no Perl overhead
- Performance - no nsgmls overhead
- Flexibility - generates results as XML
- Accuracy - direct application of the parser, with minimal document
sniffing applied only to support Appendix C XHTML.
- Accuracy - no imprecise
parsing of data from an external program.
- Simplicity - the overall system size and complexity is much reduced.
- Helpfulness - friendly error messages optimised for validation
As against that, by using XML it introduces an XSLT overhead (the cost
of the additional flexibility), no effort has (yet) been made to make it
easy to install, there are various things hardcoded in the source that
shouldn't be, and the prerequisites are possibly more demanding:
- Apache 2.0 (a port for Apache 1.3 should be very straightforward,
but then browser support would be much more limited due to the absence
of an XSLT Filter module).
- OpenSP from current CVS (release 1.5 isn't quite enough).
- Xerces-C 2.2
- an SGML library and catalogue files for HTML and XML.
- XSLT stylesheets, and to support a broad range of browsers
an appropriate server-side processor such as
May 1st. Although there are outstanding feature requests,
it is three weeks since the last problem report was fixed. We are
declaring this to be the first stable release.
mod_validator source code is
available here under the
GNU General Public License (GPL).