Re: qname shortland starting with a digit

Andy,

Thanks for the information.

Looks like SPARQL made some very convenient decisions. Thanks, WG!

-Tim Lebo


On Mon, Jun 29, 2009 at 1:18 PM, Andy Seaborne <andy.seaborne@hp.com> wrote:

>
>
> Tim rdf wrote:
>
>> Luc,
>>
>> Sesame 2.2.4 does not handle digits at the start of the local part of a
>> QName, either. (Perhaps 3.0b does, but I haven't found the time)
>>
>> Jena 2.5.4 and Jena 2.6.0 do, however.
>>
>> Rather annoying behavior. I heard claims of "Historic XML namespace QName
>> compliance", but Saxon handles elements with "digit names" in Plain Old
>> XML....
>>
>> Does anyone know why tools are mixed on how they handled digits in QNames?
>> I would imagine that it would be a natural desire.
>>
>
>
> The Jena reader is adhering to the principle of being permissive in what it
> accepts.  The Jena readers for Turtle are derived from SPARQL where the
> local part of a prefixed name does allow a digit as the start char.
>
> QNames (as in the XML Namespaces concept) do not allow the local part to
> start with digit.  SPARQL does not call it's abbreviations "qnames".
>
> Turtle submission:
> """
> 10. Turtle compared to SPARQL
> ...
> # SPARQL allows '.'s in names in all positions apart from the first or
> last.
> # SPARQL allows digits in the first character of the PN_LOCAL lexical
> token. In Turtle, the only ascii characters allowed in a nameStartChar are
> [A-Z] | "_" | [a-z].
> """
>
> SPARQL changed to allow the leading digits in the local part during the
> time of the original working group based on quite a lot of user input.
>
> I don't know of any reason not to accept digits at the start of the local
> part.  For URIs derived from other naming schemes, it comes up naturally and
> forcing full forms <>, or strange prefix choices, adds no value.
>
>        Andy
>
>
>
>
>> Regards,
>> Tim Lebo
>>
>> On Mon, Apr 27, 2009 at 5:49 AM, luc peuvrier at home <lc.pvrr@orange.fr
>> <mailto:lc.pvrr@orange.fr>> wrote:
>> Hi,
>>
>> For the following uri <http://tap.xmlns.com/data/7UpBrand>
>>
>> A n3 file can contains:
>>
>>  @prefix data: <http://tap.xmlns.com/data/>
>>  :x a data:7UpBrand
>>
>> The n3 grammar do not accept "data:7UpBrand"
>>
>> I propose to change qname non terminal definition as follow:
>>
>> [qname] : name       | ':' n_name_opt
>>      | name ':' n_name_opt
>>      ;
>>
>> n_name_opt :
>>         | n_name
>>         ;
>>
>> where n_name is a name that can start with a digit
>>
>> Luc Peuvrier
>>
>>
>>
>>
>>