• Chapter 1: Getting Started with Stylus Studio®
• Chapter 2: Editing and Querying XML
• Chapter 3: Converting Non-XML Files to XML
• Chapter 4: Working with XSLT
  • Getting Started with XSLT
  • Tutorial: Understanding How Templates Work
  • Working with Stylesheets
  • Specifying Extension Functions in Stylesheets
    • Using an Extension Function in Stylus Studio
    • Basic Data Types
    • Declaring an XSLT Extension Function
    • Working with XPath Data Types
    • Declaring an Extension Function Namespace
    • Invoking Extension Functions
    • Finding Classes and Finding Java
    • Debugging Stylesheets That Contain Extension Functions
  • Working with Templates
  • Using Third-Party XSLT Processors
  • Validating Result Documents
  • Post-processing Result Documents
  • Generating Formatting Objects
  • Generating Scalable Vector Graphics
  • Generating Java Code for XSLT
  • XSLT Instructions Quick Reference
• Chapter 5: Creating XSLT Using the XSLT Mapper
• Chapter 6: Debugging Stylesheets
• Chapter 7: Defining XML Schemas
• Chapter 8: Defining Document Type Definitions
• Chapter 9: Writing XPath Expressions
• Chapter 10: Working with XQuery in Stylus Studio
• Chapter 11: Composing Web Service Calls
• Chapter 12: Building XML Pipelines
• Chapter 13: Publishing XML Data
• Chapter 14: Integrating with Third-Party File Systems
• Chapter 15: Extending Stylus Studio
• Chapter 16: The Stylus Studio Java API
• Chapter 17: Stylus Studio GUI Reference

Home >Online Product Documentation >Table of Contents >Declaring an XSLT Extension Function

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()); 
  } 
}