Create custom XSLT function

Question

I am trying to create a custom XSLT function, but every time I receive this error:

'The first argument to the non-static Java function 'compareCI' is not a valid object reference.'

  <xsl:stylesheet version="2.0" 
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  xmlns:foo="http://whatever">

  <xsl:function name="foo:compareCI">
    <xsl:param name="string1"/>
    <xsl:param name="string2"/>
    <xsl:value-of select="compare(upper-case($string1),upper-case($string2))"/>
  </xsl:function>

  <xsl:template match="/">
      <xsl:value-of select="foo:compareCI('red','blue')"/>
  </xsl:template>

</xsl:stylesheet>

I hope someone of you can help me .Thanks a lot in advance.

It is working fine at my end in Oxygen. It is giving result '1' when comparing 'red' with 'blue', and '0' when comparing 'red' withn'red' — Navin Rawat
– Navin Rawat, Commented Apr 23, 2013 at 8:42
How do you run your XSLT and with which processor? (I used Saxon-HE 9.4.0.6 and it works) — Philipp
– Philipp, Commented Apr 23, 2013 at 8:52
I don't know which version used Java. My Java code is TransformerFactory factory = TransformerFactory.newInstance(); Source xslt = new StreamSource(new File("/home/xxx/xxx/aliformater-1.xslt")); Transformer transformer = factory.newTransformer(xslt); — javagc
– javagc, Commented Apr 23, 2013 at 10:17

Michael Kay · Accepted Answer · 2013-04-23 09:57:32Z

7

I think you are trying to run this using Xalan, which is an XSLT 1.0 processor and therefore doesn't recognize xsl:function. What's happening is that (a) Xalan ignores the xsl:function, because an XSLT 1.0 processor that is given a stylesheet specifying version="2.0" is supposed to ignore things it doesn't understand (called "forwards compatibility mode" in the spec); and then when it sees the function call to foo:compareCI() it thinks this must be a call to an external Java method.

You need to run this with an XSLT 2.0 processor, typically Saxon.

answered Apr 23, 2013 at 9:57

Michael Kay

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