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Re: Proposed fixed version of N-Triples https://www.w3.org/TR/n-triples/ Section 7

From: Peter F. Patel-Schneider <pfpschneider@gmail.com>
Date: Fri, 7 Jul 2017 08:38:06 -0700
To: Wouter Beek <wouter@triply.cc>
Cc: "public-rdf-comments@w3.org" <public-rdf-comments@w3.org>
Message-ID: <0db43fd8-8d89-550c-dafe-2660f8bcdb68@gmail.com>
Yes, I mistyped the Hex for octothorpe.

One of the problems with building a single-level grammar for n-triples is how
to deal with comments.   As comments can only occur at the end of a line, it
makes sense to fold them into the production for ends of lines (and the end of
the document).

Another problem with the n-triples grammar is its treatment of carriage return
and line feed.


I don't know what the right course to solve these problems should be.  I'm
almost at the point where I think that the only suitable remedy is revised TRs
for N-Triples and N-Quads, and probably also Turtle.

peter


On 07/07/2017 08:02 AM, Wouter Beek wrote:
> Hi Peter, others,
> 
> Thanks for working on clarifying the grammar!
> 
> On Thu, Jun 29, 2017 at 11:15 AM, Peter F. Patel-Schneider
> <peter.patel-schneider@nuance.com <mailto:peter.patel-schneider@nuance.com>>
> wrote:
> 
>     [7]     EOL     ::=     ( WS? ('#x22' [^#xD#xA]* )? [#xD#xA] )+
> 
>     [7a]    END     ::=     EOL? WS? ('#x22' [^#xD#xA]* )?
> 
> 
> Do you mean #x23 in the above two rules?  I'm not sure what a double quote
> would do there, but a line comment might make sense.
> 
> Now that end-of-line characters are made explicit in the grammar, I'm
> wondering whether there are implications for the way in which line numbers are
> reported by processors?  E.g., if a parser encounters a bug on a certain line
> it is nice if the user is able to go to that line and fix the bug there.
> 
> Most processors will use Unix and/or Windows end-of-line conventions and will
> report an error on the second line of the following content (i.e., missing
> end-of-statement character):
> 
> ```
> <x:x><x:x><x:x>.#xD#xA<y:y><y:y><y:y>
> ```
> 
> But according to the N-Triples grammar, the missing end-of-statement character
> is not on the second but on the third line.
> 
> ---
> Cheers!,
> Wouter.
> 
> Email: wouter@triply.cc <mailto:wouter@triply.cc>
> WWW: http://triply.cc
Received on Friday, 7 July 2017 15:38:44 UTC

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