Re: WebID default serialization for WebID 2.x

Quoting Martynas Jusevičius (2022-01-26 13:50:57)
> > > This exactly fits my interpretation #2: with an Accept: 
> > > text/turtle request header, a WebID profile document MUST always 
> > > return Content-Type: text/turtle
> >
> > So with your interpretation #2, what is served in the *default* 
> > situation of *not* explicitly requesting Turtle?
> 
> Normally that should be up to the server. In my logs I sometimes see 
> that our clients and servers communicate in formats I didn't even know 
> Jena supports, like binary RDF-Thrift.

Yes, lots of things are possible, in non-default cases.


> If a server has a Turtle serializer, it will satisfy the "MUST be able
> to provide text/turtle", period. The difference is regarding how this
> constraint is communicated:
> 1. by hardcoding it into the protocol specification
> 2. by doing conneg with an Accept header that prefers text/turtle
> (gives it highest q value)
> 
> You seem to be advocating #1, but in what way does #2 not satisfy the
> same MUST constraint? Plus that #2 actually follows the WWW
> Architecture.

WebID is not an architecture.  It fits into other specs integrating with 
an architecture, and _those_ specs may suggest (MAY) or recommend 
(SHOULD) or mandate (MUST) certain behavious related to that 
integration.  E.g. a nuclear power plant might specify that if requested 
something that cannot be provided then do not serve anything else nor 
throw an error, but INITIATE SCRAM: https://en.wikipedia.org/wiki/Scram


> And I'm also still interested in hearing what happens when HTML is
> requested in case of #1.

Conneg is specified only as optional, not mandatory, in core WebID spec, 
and consequently for the *default* case (i.e. where only MUSTs are 
covered and therefore conneg is totally ignored) any conneg constraints 
are totally ignored and specification says Turtle format MUST be 
supported so Turtle format will get delivered.


 - Jonas

-- 
 * Jonas Smedegaard - idealist & Internet-arkitekt
 * Tlf.: +45 40843136  Website: http://dr.jones.dk/

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