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  • Chapter 1: Getting Started with Stylus Studio®
  • Chapter 2: Editing and Querying XML
  • Chapter 3: Converting Non-XML Files to XML
  • Chapter 4: Converting EDI to XML
  • Chapter 5: Working with XSLT
  • Chapter 6: Creating XSLT Using the XSLT Mapper
  • Chapter 7: Debugging Stylesheets
  • Chapter 8: Defining XML Schemas
  • Chapter 9: Defining Document Type Definitions
  • Chapter 10: Writing XPath Expressions
  • Chapter 11: Working with XQuery in Stylus Studio
  • Chapter 12: Composing Web Service Calls
  • Chapter 13: Working with WSDL Documents
  • Chapter 14: Building XML Pipelines
  • Chapter 15: Publishing XML Data
  • Chapter 16: Integrating with Third-Party File Systems
  • Chapter 17: Extending Stylus Studio
  • Chapter 18: The Stylus Studio Java API
  • Chapter 19: Stylus Studio GUI Reference

    • Home >Online Product Documentation >Table of Contents >IF Blocks

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    IF Blocks

    IF blocks have a single input port, labeled condition; a Flow port; and two result ports: if then, and if else.

    Figure 346. IF Block

    You use IF blocks to compose if then, else XQuery expressions, such as the following:

    		<Book> 
			{ 
				if( $book/title ) then 
					<Title/> 
				else 
					<ISBN/> 
			} 
		</Book>

    This expression, for example, was composed by mapping

    IF blocks create a structure if the if then or if else branches are true. These ports can be connected to the target schema; otherwise they can be connected to Flow ports of FLWOR, function, and other IF blocks.

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