Question

I have XML data

   <logData>
      <log>
         <id>1</id>
      </log> 
      <log>
         <id>2</id>
      </log> 
      <log>
         <id>3</id>
      </log> 
      <log>
         <id>4</id>
      </log> 
   </logData>  

I want get only part of logs using xslt transformation using fn:subsequence function

here is my xslt

<?xml version="1.0" encoding="UTF-8"?> 
    <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" xmlns:fn="http://www.w3.org/2006/xpath-functions" version="1.0" >
       <xsl:output method="xml" indent="yes" />     
       <xsl:strip-space elements="*"/>

       <xsl:template match="/logData" >
          <xsl:element name="log">
             <xsl:copy-of select="fn:subsequence(./log, 2, 3)"/>
          </xsl:element>
       </xsl:template>
    </xsl:stylesheet>   

and I get

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

I am using Java transformation API, part of Java SE 1.6.
Can you help me?

Answer 1

<xsl:copy-of select="fn:subsequence(./log, 2, 3)"/>

The function subsequence() is defined in XPath 2.0 and is available only in an XSLT 2.0 processor.

In XSLT 1.0 use:

<xsl:copy-of select="log[position() > 1 and not(position() > 4)]"/>

Here is a complete transformation:

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
 <xsl:output omit-xml-declaration="yes" indent="yes"/>
 <xsl:strip-space elements="*"/>

 <xsl:template match="/*">
     <xsl:copy-of select="log[position() > 1 and not(position() > 4)]"/>
 </xsl:template>
</xsl:stylesheet>

When this is applied on the provided XML document:

<logData>
    <log>
        <id>1</id>
    </log>
    <log>
        <id>2</id>
    </log>
    <log>
        <id>3</id>
    </log>
    <log>
        <id>4</id>
    </log>
</logData>

the wanted, correct result is produced:

<log>
   <id>2</id>
</log>
<log>
   <id>3</id>
</log>
<log>
   <id>4</id>
</log>