- From: Michael Kay <mhk@mhk.me.uk>
- Date: Thu, 19 Feb 2004 08:52:18 -0000
- To: <public-qt-comments@w3.org>
I am passing this on from one of my users, who pointed out that Saxon's behavior differs from the spec. I believe that Saxon is correct and the spec is wrong. The referenced statement in the spec is: "For xs:float and xs:double operands, floating point division is performed as specified in [IEEE 754-1985] and INF or -INF is returned if the divisor is zero." But I believe that according to IEEE 754, dividing zero by zero gives NaN. It would be better not to make normative statements that attempt to precis IEEE 754: it would be much safer if such things were said in notes, so that it is clear the IEEE definition is the normative one. Michael Kay -----Original Message----- From: saxon-help-admin@lists.sourceforge.net [mailto:saxon-help-admin@lists.sourceforge.net] On Behalf Of Erik Bruchez Sent: 19 February 2004 01:19 To: saxon-help@lists.sourceforge.net Subject: [saxon] Division by zero question Consider this example: <xsl:value-of select="xs:double(0) div 0"/> This operates a floating-point division. With Saxon 7.8, this returns NaN, but the spec does specify that INF and -INF are returned in the case of a division by zero: http://www.w3.org/TR/xpath-functions/#func-numeric-divide Is this a bug in Saxon, a bug or imprecision in the spec, or is this implicitly covered by [IEEE 754-1985]? -Erik
Received on Thursday, 19 February 2004 03:51:37 UTC