Declaring an XSLT Extension Function

Extension functions must have one of the following signatures:

public Object FxnName()
       
public Object FxnName(Type1 var1, Type2 var2,...)
       
public static Object FxnName()
       
public static Object FxnName(Type1 var1, Type2 var2,...)

A class that contains an extension function might look like the following:

import org.w3c.dom.*;
               
import java.lang.Double;
               
public class NumberUtils
               
{ 
               
  public Object Average(NodeList nl)
               
  {
               
    double nSum = 0;
               
  for (int i = nl.getLength() - 1; i >= 0; i--)
               
   {
               
    nSum += 
               
    Double.valueOf(nl.item(i).
               
    getNodeValue()).doubleValue();
               
   }
               
  return new Double(nSum / nl.getLength());
               
  }
               
}

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XPath Introduction - Using XPath Queries to Extract Data from XML Documents

Varying Record Layout to XML

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