Hello,
from the XPath 1.0 specification [1] on the value of number() function
applied to a string:
...
The number function converts its argument to a number as follows:
* a string that consists of optional whitespace followed by an
optional minus sign followed by a Number followed by whitespace
is converted to the IEEE 754 number that is nearest (according
to the IEEE 754 round-to-nearest rule) to the mathematical value
represented by the string; any other string is converted to NaN
...
[30] Number ::= Digits ('.' Digits?)?
| '.' Digits
[31] Digits ::= [0-9]+
...
So "number('+5')" should result in NaN.
Here is the result of "number('+5')" for different XSLT processors:
Chrome NaN
DataPower NaN
Firefox NaN
IE NaN
Opera 5
Safari NaN
saxon 5
xalan 5
xsltproc NaN
Two questions:
1) Is it true that XSLT processors returning 5 are non-compliant?
2) Is the following a good workaround?
<xsl:variable name="str" select="'+5'"/>
<xsl:value-of select="number(substring($str,1+starts-with($node,'+')))"/>
Here are the stylesheet/XML file used to generate the table:
$ cat number-plus.xml
<?xml-stylesheet href="number-plus.xsl" type="text/xsl"?>
<dummy/>
$
$ cat number-plus.xsl
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
<xsl:output method="html"/>
<xsl:template match="/">
<html><pre>
<xsl:text> number('5')=</xsl:text>
<xsl:value-of select="number('5')"/>
<xsl:text> number('-5')=</xsl:text>
<xsl:value-of select="number('-5')"/>
<xsl:text> number('+5')=</xsl:text>
<xsl:value-of select="number('+5')"/>
<xsl:text> </xsl:text>
</pre></html>
</xsl:template>
</xsl:stylesheet>
$
$ xsltproc number-plus.xsl number-plus.xml
<html><pre>
number('5')=5
number('-5')=-5
number('+5')=NaN
</pre></html>
$
[1] http://www.w3.org/TR/xpath/#function-number
Mit besten Gruessen / Best wishes,
Hermann Stamm-Wilbrandt
Developer, XML Compiler, L3
WebSphere DataPower SOA Appliances
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