Re: erratum: terminology about IRIs is (slightly) wrong in RDF specs

I agree with Pierre-Antoine.

The wording could be tightened up.

RDF Concepts says:

"IRIs in the RDF abstract syntax MUST be absolute, and MAY
  contain a fragment identifier."

but (RFC 3987) the absolute-IRI rule doesn't have a fragment so at least 
the wording should be "may also contain" but "conform to the "IRI" 
syntax is enough here.


While in the area:

By RFC 3986/87:

    http:abc

is an IRI (and absolute-IRI).

It is the HTTP URI scheme (RFC7230 sec 2.7.1) that requires the 
authority to get http://host/path.

There needs to be an additional requirement to follow the rules of the 
specific scheme.

"and SHOULD conform to any additional rules of the URI scheme, and URN 
namespace if a URN."

("SHOULD" because this is a change).

For "http:", syntax parsers can be recommended to resolve same-scheme 
URIs in non-strict mode (RFC3986/sec 5.2.2) and then a reference written 
"http:abc" and well-formed base http: URI will produce an HTTP URI.

URNs have additional rules and so do the URN namespaces (e.g. UUID URNs)

Is it worth defining a piece of terminology e.g. "RDF Reference"  to 
collect the points together?

     Andy

On 31/03/2021 17:48, Pierre-Antoine Champin wrote:
> Hi all,
> 
> RDF specifications talk a lot about IRIs. Sometimes, the distinction is 
> made between absolute IRIs and relative IRIs. I discovered some time ago 
> that this is inaccurate.
> 
> According RFC3987 [1], IRIs can not be relative, only *IRI references* 
> can. Therefore, "absolute IRI" is redundant (but correct), while 
> "relative IRI" should be "relative IRI reference".
> 
> Note that, from what I saw, this impacts the following documents:
> 
>      RDF 1.1 Concepts and Abstract Syntax
>      RDF 1.1 Turtle
>      RDF 1.1 TriG – RDF Dataset Language
>      RDF 1.1 XML Syntax
> 
> the others make use of "IRI", "absolute" and "relative" in a way that's 
> consistent with RFC3987.
> 
>    pa
> 
> [1] https://www.ietf.org/rfc/rfc3987.txt
>

Received on Friday, 2 April 2021 13:39:19 UTC