Re: [xsl] questions on "number('+5')"

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Subject: Re: questions on "number('+5')"
From: Michael Kay <mike@xxxxxxxxxxxx>
Date: Mon, 30 Aug 2010 18:43:35 +0100

So "number('+5')" should result in NaN.

In XSLT 1.0, yes, it should. In XSLT 2.0 it should result in the integer 5.

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

Saxon 9.x correctly reports the result 5. Saxon 6.5.5 correctly reports the result NaN.


Two questions:
1) Is it true that XSLT processors returning 5 are non-compliant?

They are non-compliant with XSLT 1.0, yes.

2) Is the following a good workaround?

<xsl:variable name="str" select="'+5'"/>
<xsl:value-of select="number(substring($str,1+starts-with($node,'+')))"/>

It depends a bit on the syntax you want to accept and the error checking you want to perform. For many purposes, number(translate($str, '+','')) would work adequately.

Michael Kay
Saxonica

Current Thread
questions on "number('+5')" Hermann Stamm-Wilbrandt - 30 Aug 2010 09:38:17 -0000 Hermann Stamm-Wilbrandt - 30 Aug 2010 10:01:02 -0000 Michael Kay - 30 Aug 2010 17:43:54 -0000 <= Hermann Stamm-Wilbrandt - 30 Aug 2010 17:54:57 -0000

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