- From: Graham Klyne <GK@ninebynine.org>
- Date: Mon, 29 Apr 2002 10:15:54 +0100
- To: "Sean B. Palmer" <sean@mysterylights.com>
- Cc: "RDF Interest group" <www-rdf-interest@w3.org>
At 01:54 AM 4/26/02 +0100, Sean B. Palmer wrote: >That aside, I'm hoping that this parser will be swift and portable. >However, I tried it on some real-world N3 data [1], and got some odd >errors:- >the data is valid, and CWM parses it just fine. Could you possibly check >this out for me? It seems as if it just doesn't allow the ":" prefix, which >is odd. > >[1] http://infomesh.net/2001/12/map/data.n3 I've fixed the directive errors, but that data raises a question about N3 syntax: Consider: x:ANB a:icao "KANB"; and also: x:ANB a:icao . I would have thought the latter is syntactically valid N3, but cwm thinks not. But this is: x:ANB a :icao . So it appears that the disambiguation of 'a' as a prefix and 'a' meaning rdf:type is based on whether it is immediately followed by a space. Does this seem right? I've updated my parser so that a name followed immediately by a colon is a distinct lexical entity, and fixed a number of other bugs. Your file [1] now parses without errors. Thanks again for the test data. It's now part of my (limited) test suite. I've also started porting this code to Jython (with a view to front-ending a Jena RDB Model). The N3 parser works OK, but I'm having some troubles with some of the file support routines -- os.access() not supported. Are there any other easy ways you'd recommend, using Python to (a) check that a file exists and is readable, and (b) that a directory exists and is writeable? The software at [2] is updated with the fixes. BTW, for ease of testing the programs N3SyntaxCheck.py and N3GenMsgRegistry.py default to using some standard files if no command line arguments are supplied -- that logic (i.e. "if not argv or len(argv) <= 1: ...") should probably be removed if these are used in different environments. #g [1] http://infomesh.net/2001/12/map/data.n3 [2] http://www.ninebynine.org/Software/N3ReportGenerator.zip ------------------- Graham Klyne <GK@NineByNine.org>
Received on Monday, 29 April 2002 05:06:56 UTC