• 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 > Working with XPath Data Types

Working with XPath Data Types

The XPath types Boolean and Number can map either to the corresponding Java primitive types or to the corresponding Java object types. If the XPath processor is looking for a function that accepts XPath parameters 3.2 and true, it looks first for a function that accepts (double, boolean) and then (Double, Boolean). Functions that accept some combination of primitive types and object types are not recognized by the XPath processor.

The XPath processor determines the actual return type of a function at run time. For example, the XPath processor treats the return type of the function in the preceding section as an XPath Number because the object it returns is an instance of the Java class Double. You must declare all functions to return type Object, regardless of the actual type of the return value.