Subject: Re: [xsl] Floating point numbers in XPath From: "Richard Jinks" <cyberthymia@xxxxxxxxxxx> Date: Tue, 9 Apr 2002 16:10:34 +0100 |
From: "B. Tommie Usdin" <btusdin@xxxxxxxxxxxxxxxx> > >From: burisch@xxxxxxxxxx > >To: XSL-List@xxxxxxxxxxxxxxxxxxxxxx > >Reply-To: curtis@xxxxxxxxxx > >Subject: Re: [xsl] Floating point numbers in XPath > >Date: Tue, 09 Apr 2002 15:17:00 +0100 > > > >Jeni, > > > >Something caught my attention. > > > >You said: > > > >>[134] DoubleLiteral ::= (("." [0-9]+) | > >> ([0-9]+ ("." [0-9]*)?)) > >> ([e] | [E]) ([+] | [-])? [0-9]+ > > > >The first bit caught my attention: ("." [0-9]+) > >This appears to me to be incorrect. It would allow .0 as a valid > >DoubleLiteral, and runs counter to the other rules you mentioned. (+-0 - > > > >> "0"; 0.1 -> "0.1"; ".1" is invalid because there are <1 digits to the > > > >left of the decimal point.) > > > >Comments? It's possible I'm just having my usual lousy Tuesday... > > > >Regards, > >Curtis. > Hi I haven't had time to read the XPath 2 working draft yet so Jeni would still probably be the best person to answer this, but... This is already allowed in XPath v1, if my reading of the spec is correct - http://www.w3.org/TR/xpath#NT-Number [30] Number ::= Digits ('.' Digits?)? | '.' Digits [31] Digits ::= [0-9]+ The bit about needing at least one digit only applies for converting numbers to strings with the string() function. http://www.w3.org/TR/xpath#function-string It doesn't apply for numbers as a whole, or for converting strings to numbers with the number() function. http://www.w3.org/TR/xpath#function-number As this is the case, it seems sensible to continue the trend and apply similar rules to the new numeric types (e.g. DoubleLiteral) in XPath 2. Richard _________________________________________________________ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.com XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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