Re: empty prefix value

http://www.w3.org/Bugs/Public/show_bug.cgi?id=3264#c15
"The ˇvalue spaceˇ of anyURI is the set of finite-length sequences of 
zero or more characters.."

If this (a 0 length uri-reference as you find in href="") isn't valid 
for @prefix then do we need to define that in rdfa core with a note / 
constraint / bnf?

Best,

Nathan

Shane McCarron wrote:
>  Actually, I think I disagree.  The first example would not match the 
> pattern for @prefix values. The second wouldn't either, but in some 
> implementations might map 'foo' to 'bar:' then not do anything with the 
> rest of the value.
> 
> On 9/28/2010 12:32 PM, Nathan wrote:
>> Hi All,
>>
>> Just been working on CURIE (and prefix) resolution and realised that 
>> given that @prefix contains a whitespace separated list of NCName to 
>> xs:anyURI's then a zero length value is possible, as in:
>> <div prefix="foo: ">
>> and:
>> <div prefix="foo:  bar: http://example.org/o#">
>>
>> Unsure if this is an issue or not but thought it best to mention.
>>
>> Best,
>>
>> Nathan
>>
>> expanded info:
>>
>>  - @prefix = NCName ':' ' ' + xs:anyURI
>>  - xs:anyURI can be a URI or a URI Reference
>>  - URI-reference = URI / relative-ref
>>
>> relative-ref can be (amongst other things) path-empty (0-length) or 
>> path-noscheme, which given the (trimmed) BNF:
>>
>>   path-noscheme = segment-nz-nc *( "/" segment )
>>   segment-nz-nc = 1*( unreserved / pct-encoded / sub-delims / "@" )
>>   unreserved    = ALPHA / DIGIT / "-" / "." / "_" / "~"
>>   sub-delims    = "!" / "$" / "&" / "'" / "(" / ")"
>>                  / "*" / "+" / "," / ";" / "="
>>
>> means that afaict, the following is currently valid
>>
>> <div prefix="foo:  bar: @ baz: $!+~"> ...
>>
>> resulting in:
>>   "foo" => ""
>>   "bar" => "@"
>>   "baz" => "$!+~"
>>
>>
>>
>

Received on Tuesday, 28 September 2010 19:39:07 UTC