Extension functions in XSL (Saxon)

[Derek Hohls <DH...@csir.co.za>]

I am running Cocoon 2.1.5 under Windows XP, Java 1.4.2

I have the following test files:

math.xml
<?xml version="1.0" encoding="UTF-8"?>
<root>
  <number>42</number>
</root>

math.xsl
<?xml version="1.0"?> 
<xsl:stylesheet
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  xmlns:math="java:java.lang.Math"
  version="1.0">

<xsl:template match="/">
  <xsl:value-of  select="math:max(5,10)"/>
  *
  <xsl:value-of  select="math:cos(100)"/>
</xsl:template>
 
</xsl:stylesheet>  

when I run this through Saxon  on the command line,
I get :

test.xml
<?xml version="1.0" encoding="utf-8"?>10
*
0.8623188722876839

but when I try the same process under Cocoon, I get:

org.apache.cocoon.ProcessingException: Failed to execute pipeline.:
java.lang.RuntimeException: java.lang.NoSuchMethodException: For
extension function, could not find method
java.lang.Double.max([ExpressionContext,] #NUMBER).

Any ideas how to get extension functions like this to work?

Thanks
Derek

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Re: Extension functions in XSL (Saxon)

[Norman Barker <no...@comsine.co.uk>]

Derek Hohls wrote:

>I am running Cocoon 2.1.5 under Windows XP, Java 1.4.2
>
>I have the following test files:
>
>math.xml
><?xml version="1.0" encoding="UTF-8"?>
><root>
>  <number>42</number>
></root>
>
>math.xsl
><?xml version="1.0"?> 
><xsl:stylesheet
>  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
>  xmlns:math="java:java.lang.Math"
>  version="1.0">
>
><xsl:template match="/">
>  <xsl:value-of  select="math:max(5,10)"/>
>  *
>  <xsl:value-of  select="math:cos(100)"/>
></xsl:template>
> 
></xsl:stylesheet>  
>
>when I run this through Saxon  on the command line,
>I get :
>
>test.xml
><?xml version="1.0" encoding="utf-8"?>10
>*
>0.8623188722876839
>
>but when I try the same process under Cocoon, I get:
>
>org.apache.cocoon.ProcessingException: Failed to execute pipeline.:
>java.lang.RuntimeException: java.lang.NoSuchMethodException: For
>extension function, could not find method
>java.lang.Double.max([ExpressionContext,] #NUMBER).
>
>Any ideas how to get extension functions like this to work?
>
>Thanks
>Derek
>
>  
>
I think because in Cocoon you are using Xalan, you can do it this way

xmlns:math="http://exslt.org/math"

and then declaring 
<xsl:value-of  select="math:max(5,10)"/>

will work.

Alternative you can use the namespace
xmlns:math="xalan://java.lang.Math"

which will allow you to use the java functions.

The former is preferable as it is not dependent on
the stylesheet processor.

Norman

-- 
Norman Barker
Software Engineer
ComSine Ltd
Tel: +44 (0)1483 457121
Web: http://www.comsine.com
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