W3C home > Mailing lists > Public > public-hydra@w3.org > July 2014

Re: Call for consensus on defining IRI template expansion (ISSUE-30)

From: Tomasz Pluskiewicz <tomasz@t-code.pl>
Date: Wed, 16 Jul 2014 21:04:54 +0200
Message-ID: <CAAFOhSenSNKc_NRm8WJ=54mtBBw5owABa_wW=Z9ff-qO+2AL6w@mail.gmail.com>
To: Gregg Kellogg <gregg@greggkellogg.net>
Cc: Markus Lanthaler <markus.lanthaler@gmx.net>, "public-hydra@w3.org" <public-hydra@w3.org>
Regarding encoding of values I think we should be as strict and simple
as possible and reuse standards:

1. Accept only absolute URIs (no angle brackets)
2. Take any value as-is and apply standard encoding

And I'm not sure that language tags and typed literals are even
necessary here. I would personally be using an operation with some RDF
body if I wanted to transmit such payload.

On Wed, Jul 16, 2014 at 7:40 PM, Gregg Kellogg <gregg@greggkellogg.net> wrote:
> On Jul 16, 2014, at 10:26 AM, Markus Lanthaler <markus.lanthaler@gmx.net> wrote:
>
>> Currently, the expansion of IRI templates is underspecified in the sense
>> that it is not defined how a value (IRI, string, number, etc.) should be
>> included in the expanded IRI. Thus the proposal is to only use the lexical
>> representation of the value or the IRI (no quoting) by default.
>> Additionally, we will add a flag, i.e., a property whose value is a boolean,
>> hydra:expandedRepresentation to IriTemplateMapping, that, if set to true,
>> changes the expansion to work as follows:
>>
>>  - The lexical representation is enclosed in quotes with no escaping of
>>    the value itself
>>  - the datatype xsd:string is always omitted
>>  - language tags are appended to the lexical representation by using an
>>    @ symbol
>>  - datatypes are added using ^ (just one) and then the URL without
>>    enclosing it in <>
>>  - URLs are kept as they are
>>
>> Thus, the following values in Turtle notation expand to the following
>> strings when used in a IRI template
>>
>>  - """Value with a " inside"""  --> "Value with a " inside"
>>    (without the """ the inner quote would have to be escaped in Turtle)
>>  - "English"@en --> "English"@en
>>  - "24"^^<xsd:integer> --> "24"^http://www.w3.org/2001/XMLSchema#integer
>>  - http://example.com/ --> http://example.com/
>
> I'd like to see more general motivation for this feature, including some more explicit examples of using IRI templates.
>
> Why break from Turtle/N-Triples on ^ vs ^^? Otherwise, this looks like an N-Triples format, where IRIs are "bare", and literals are always quoted.
>
> Also, this proposal doesn't seem to consider the general discussion on the issue.
>
> Gregg
>
>
>> This serves as a call for consensus on the proposed solution. Before I
>> proceed with marking the issue [1] as resolved and implementing the changes
>> in the spec, I would like to ask if anyone has any concerns or objections
>> against this proposal.
>>
>> Please submit your comments by Wednesday, July 23rd.
>>
>>
>> Thanks,
>> Markus
>>
>>
>> [1] https://github.com/HydraCG/Specifications/issues/30
>>
>>
>> --
>> Markus Lanthaler
>> @markuslanthaler
>>
>>
>
>
>
Received on Wednesday, 16 July 2014 19:06:04 UTC

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