[XSL-LIST Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] RE: Addition/Subtraction of numbers.
The XPath function number() does not return a string. It returns the number which is the result of converting the argument according to a specified set of rules. See:
The only time "number($t1) = number($t1)" will be false is when the result of converting the value bound to $t1 is NaN, since NaN is never equal to anything, _including itself_. In fact, any comparison of NaN with any other value will always be false. It's one of those exceedingly clever, but not always obvious idioms. Dave
Hi Jeni, I'm curious about your solution: > In XSLT 1.0 you need something like: > > <xsl:variable name="n1"> > <xsl:choose> > <xsl:when test="number($t1) = number($t1)"> > <xsl:value-of select="$t1" /> > </xsl:when> > <xsl:otherwise>0</xsl:otherwise> > </xsl:choose> > </xsl:variable> > <xsl:variable name="n2"> > <xsl:choose> > <xsl:when test="number($t2) = number($t2)"> > <xsl:value-of select="$t2" /> > </xsl:when> > <xsl:otherwise>0</xsl:otherwise> > </xsl:choose> > </xsl:variable> > <xsl:variable name="temp1" select="$n1 + $n2" /> I have the understanding that the XPath number() function will return the string 'NaN' if the parameter passed in is not a number. Though, at a lower level, won't the same function called twice with identical parameter(s) return the same thing? So, when would your test of "number($t1) = number($t1)" fail? Confusedly, Joshua
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