W3C home > Mailing lists > Public > public-rdf-in-xhtml-tf@w3.org > November 2008

Not sure... (Re: Invalid namespace URI)

From: Ivan Herman <ivan@w3.org>
Date: Thu, 13 Nov 2008 11:07:44 +0100
Message-ID: <491BFC70.7030207@w3.org>
To: Peter Mika <pmika@yahoo-inc.com>
CC: public-rdf-in-xhtml-tf@w3.org
I actually wonder...

RDFa uses the xmlns syntax for URI prefixing only. Ie, the only thing
that counts is whether it is a valid URI. If the result of the
processing is to generate

http://creativecommons.org/ns&20#

that _is_ a valid URI, isn't it? Ie, I guess the bug in the current
distiller code is that URI-s should be properly quoted.

Having said that, such setting is probably an error, so if there is a
space in the string than a warning is probably in order. But, who knows,
some crazy users may want to use such a URI...

Ivan

Ivan Herman wrote:
> Hi Peter,
> 
> thanks for the note. I will have a look into it but yes, the tool should
> probably warn...
> 
> Ivan
> 
> Peter Mika wrote:
>> Hi All,
>>
>> We have found another corner case while looking at all the wonderful
>> RDFa on the Web:
>>
>> The page at [1] contains:
>>
>>
>> This
>> work by <a
>> xmlns:cc="http://creativecommons.org/ns
>> #
>> "
>>
>> which is probably not intended (the page is broken in some sense). When
>> run through either the XSLT or the Distiller this
>> becomes:
>>
>>      <cc:attributionName xmlns:cc="http://creativecommons.org/ns #">New
>> Jersey State Auto
>> Auction</cc:attributionName>
>>
>> which is normalized [1] as
>> xmlns:cc="http://creativecommons.org/ns&#x20
>> <http://creativecommons.org/ns&#x20>;#">
>>
>> It seems to me that what you get is XML well-formed but not
>> namespace-well-formed [2] because the attribute value is not a valid URI.
>>
>> Not sure really what to do about this but the output is not very
>> useful... should the tools raise some warning?
>>
>> Thanks,
>> Peter
>>
>> [1] http://www.w3.org/TR/REC-xml/#AVNormalize
>> [2] http://www.w3.org/TR/REC-xml-names/#Conformance
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> [1] http://www.njstateauto.com/preowned/index.cfm?make=Mercedes-Benz
>>
> 

-- 

Ivan Herman, W3C Semantic Web Activity Lead
Home: http://www.w3.org/People/Ivan/
PGP Key: http://www.ivan-herman.net/pgpkey.html
FOAF: http://www.ivan-herman.net/foaf.rdf


Received on Thursday, 13 November 2008 10:08:20 GMT

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