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Re: "scheme" attribute of META element

From: Ian Hickson <ian@hixie.ch>
Date: Wed, 29 Jul 2009 18:27:25 +0000 (UTC)
To: Tom Dent <tom.dent@porism.com>
Cc: public-html-comments@w3.org
Message-ID: <Pine.LNX.4.62.0907291823350.3168@hixie.dreamhostps.com>
On Wed, 29 Jul 2009, Tom Dent wrote:
> As well as using Dublin Core, other schemes are used, such as IPSV
> (Integrated Public Sector Vocabulary): '<meta name="DC.subject"
> scheme="eGMS.IPSV" content="Youth centres"/>'. IPSV is a controlled list
> that was developed with the backing of the Department for Communities and
> Local Government (CLG - formerly the Office of the Deputy Prime Minister)
> and the e-Government Unit (e-GU) of the Cabinet Office for use by UK
> public sector organisations and is available in machine-readable format
> from here: http://www.esd.org.uk/standards/ipsv/

What other scemes are used with this name?

What happens when the value used doesn't come from the allowed list? Or 
when the scheme doesn't match "eGMS.IPSV" but the value is still one of 
the allowed values?

> Due to the fact that IPSV uses a controlled set of terms, these pages can
> be referenced in a way which is relatively easy for a machine to
> reference, as the scheme gives the name of the list to be used and the
> content gives the name of the item, making it a more reliable way of
> sourcing the exact content of the page and matching it to others that are
> used. The extent of its use means that Sitemorse, a company who check page
> validity of UK sites in several areas, use this metadata to check content:
> http://www.sitemorse.com/kb.html?kb=1266176694 and it is a feature built
> into a CMS used by UK sites:
> http://www.jadu.co.uk/info/20029/government/45/integrated_public_sector_vocabulary_ipsv/1

Could you show an example of how the scheme attribute affects the user 
experience? I looked around but couldn't find any pages that actually 
expose any of this data, so it wasn't clear to me whether any code other 
than the validators and CMSes actually used it.

Ian Hickson               U+1047E                )\._.,--....,'``.    fL
http://ln.hixie.ch/       U+263A                /,   _.. \   _\  ;`._ ,.
Things that are impossible just take longer.   `._.-(,_..'--(,_..'`-.;.'
Received on Wednesday, 29 July 2009 18:28:23 UTC

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