W3C home > Mailing lists > Public > www-validator@w3.org > August 2005

Re: Relaxed - new HTML validation service based on RELAX NG + Schematron

From: Nick Kew <nick@webthing.com>
Date: Thu, 25 Aug 2005 23:50:52 +0100
To: Jirka Kosek <jirka@kosek.cz>, www-validator@w3.org
Message-Id: <200508252350.57312.nick@webthing.com>

On Monday 22 August 2005 14:04, you wrote:

> there is available a new validating service which is able to catch much
> more errors than W3C validator. Author of this service is my student
> Petr Nalevka.

Was this a student project?  If so, is it likely to have a future?

> "Relaxed" is an easy to use HTML validation application which is special
> in the sense it doesn't use the official W3C DTD's. It rather validates
> HTML documents using schema definitions written in Relax NG with
> embedded Schematron patterns.

It's already been pointed out that this is not HTML validation.  Neither is it
XHTML validation, as that is also expressed by the W3C DTD.  Nevertheless,
I can believe it's a useful tool and service.

> This is an extremely expressive 
> combination of languages which enables validation of additional
> restrictions which can not be expressed using DTD. This includes most
> restrictions specified in the W3C HTML 4.01 and the W3C XHTML 1.0
> recommendation and some restrictions from WAI WCAG 1.0 Guidelines."

I experimented with using schematron for this about three years ago.
You've clearly taken it further than I did, as my work moved in a different 
direction (eventually to AccessValet).

> You can find more detailed information about implementation and source
> code as well on the validator page.

Thanks - just downloaded it.  Now I need time to look at it:-)

> Please give it a try if you are interested in validation services. This
> is merely protype showing validation power of RELAX NG and Schematron
> running on hardware that was new 8 years ago so please be tolerant for
> responses. We don't know what this old machine will do under more
> serious load.

That's about the age of my server:-)  AccessValet has taken a load of
20-30 hits per second, but becomes less than responsive (and I've had
to ban a couple of bots that send it rapid-fire to get results for a whole
site - none of whose authors had even told me what they they're doing).

> I would like also know whether authors of W3C validator plan to extend
> their service with RELAX NG support in the future. There seems to be
> more and more W3C spec released with RELAX NG schema available and DTDs
> are known to be quite limited in many areas.

Unlikely within the validator team.  It's most likely to happen if someone
undertakes to develop, maintain and support it.  Bear in mind that software
more commonly move *from* W3C *to* elsewhere - like Tidy, for instance.

Nick Kew
Received on Thursday, 25 August 2005 22:49:07 UTC

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