- From: Benjamin Nowack <bnowack@appmosphere.com>
- Date: Tue, 13 Dec 2005 19:42:39 +0100
- To: "Seaborne, Andy" <andy.seaborne@hp.com>, RDF DAWG comments list <public-rdf-dawg-comments@w3.org>
Ah, I see. So the query writer has to take care of that by either adding some whitespace ({?foo ?bar 1000 .}) or by some other pattern adjustment (e.g. {?foo ?bar 1000}). The "longest match" hint makes that clear. Thanks, benjamin On 13.12.2005 18:13:14, Seaborne, Andy wrote: > > >Benjamin Nowack wrote: >> >> Hi, >> >> if I understand the current grammar entry 74 for decimals >> correctly, then a trailing dot is allowed. In this case, >> (and together with the optional dot in the final triple >> of a graph pattern,) the 1000 in {?foo ?bar 1000.} could be >> an integer or a decimal, and I'm not 100% sure which literal >> ("1000" or "1000.0") to generate during the parsing process. >> Not allowing the trailing dot would make parsing numeric >> literals a little bit simpler. > >The longest match applies - it's a decimal, matching the longest decimal >string. This is compatible with typical lexers. > >I've added: > >""" >When choosing a rule to match, the longest match is choosen. >""" > >Practically, DECIMAL can be implemented as a lexer token. This is what is >done for all the parsers generated by yacker (C, C++, Perl, Python): > >http://www.w3.org/2005/01/yacker/uploads/SPARQL?lang=perl&markup=html > >There is also a JavaCC grammar (which is used to generate the EBNF): > >http://cvs.sourceforge.net/viewcvs.py/*checkout*/jena/ARQ/Grammar/sparql.jj > >> >> (I've checked the turtle and the n3 grammars, n3 does not >> allow the trailing dot, turtle however seems to allow it.) > >(but in Turtle it is an xsd:double. This may well change - under discussion.) > >In XPath 2.0, > >[72] DecimalLiteral ::= ("." Digits) | (Digits "." [0-9]*) > >so a trailing dot is allowed. > >> >> Or am I misreading the grammar rules? >> >> >> regards, >> benjamin >> >> -- >> Benjamin Nowack >> >> Kruppstr. 100 >> 45145 Essen, Germany >> http://www.bnode.org/ >> >> > >Please let us know whether you're satisfied with our response. > >If you're in a particularly helpful mood, you can put [closed] in the >subject line to save us a little bit of bookkeeping. > > Thanks > Andy > > > >
Received on Tuesday, 13 December 2005 18:43:20 UTC