• 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
  • Creating Stylesheets That Generate HTML
  • Specifying Extension Functions in Stylesheets
  • Working with Templates
  • Using an External XSLT Processor
  • Postprocessing Result Documents
  • Generating Formatting Objects
  • Generating Scalable Vector Graphics
  • 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: Accessing Relational Data as XML
• Chapter 13: Extending Stylus Studio
• Chapter 14: Stylus Studio Reference

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

Declaring an Extension Function Namespace

In conformance with the XSLT specification, extension functions are accessed through a unique namespace. The namespace declaration can be in any of the following locations:

The XPath processor treats the namespace URI as a fully qualified class name. If the class name is preceded by class:, all calls are to static methods only. Otherwise, an instance of the class is created on first use and released when stylesheet processing is complete. Performance is better when you use a static method because creation and deletion of an instance of the class is not required.

You can separate package names with either a dot ( .) or a forward slash ( /). An sample namespace declaration might look like the following:

<xsl:stylesheet xmlns:Ext="NumberUtils">
       

    

The XPath processor resolves namespace prefixes in names of extension functions relative to the namespace declarations in the stylesheet.