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Re: RDFa Default Profile Management

From: Nathan <nathan@webr3.org>
Date: Tue, 08 Feb 2011 09:11:23 +0000
Message-ID: <4D5108BB.6050609@webr3.org>
To: Ivan Herman <ivan@w3.org>
CC: Toby Inkster <tai@g5n.co.uk>, RDFa Working Group <public-rdfa-wg@w3.org>, Manu Sporny <msporny@digitalbazaar.com>
Ivan Herman wrote:
> On Feb 8, 2011, at 09:58 , Nathan wrote:
>> Ivan Herman wrote:
>>> On Feb 8, 2011, at 08:17 , Toby Inkster wrote:
>>>> On Mon, 7 Feb 2011 14:10:54 +0100
>>>> Ivan Herman <ivan@w3.org> wrote:
>>>>> There is nothing that disallows a library implementer to add a whole
>>>>> bunch of additional prefixes if they want. But the default profile
>>>>> gives you the minimum everybody can rely on!
>>>> Well, actually there is something to stop them. If a consumer includes
>>>> a default prefix mapping of something like:
>>>> 	"about" => "http://example.com/vocab/about#"
>>>> Then it will hit a compliance issue as soon as it sees:
>>>> 	<span rel="next" resource="about:blank">this is the last
>>>> 	page</span> 
>>> Why? I do not understand...
>> about: isn't an IANA registered URI scheme, however the browsers do use it, and "about:blank" is defined in HTML 5
>>  "if the resource is identified by the URL about:blank, then the resource is immediately available and consists of the empty string, with no metadata."
>> http://dev.w3.org/html5/spec/Overview.html#about:blank
>> AFAICT the rule only comes in to play, in HTML when a User Agent tries to "fetch" that URI though, say because it's in an @href.
>> Unsure if it's an issue, but it definitely has a "meaning" in html.
> This is not an issue for RDFa, though.

That would be my understanding / position too, as we don't use CURIEs in 
@href or @src, and "about:blank" isn't a URI, it's a token used to refer 
to the "empty URL" by user agents in an html document, introduced 
because the empty string "" would refer to the "current URL" after being 


Received on Tuesday, 8 February 2011 09:13:15 UTC

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