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
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