• 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
• 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: Building XML Pipelines
  • What is an XML Pipeline?
  • The XML Pipeline Editor
  • Steps for Building an XML Pipeline
  • Planning an XML Pipeline
  • Use Case: Building order.pipeline
    • order.pipeline Requirements
    • Getting Started: Creating a New XML Pipeline
    • XML Pipeline Scenarios
    • Specifying an Execution Framework
    • Configuring Data Sources
    • Using XQuery to Merge Source File Data
    • Adding an XQuery Node
    • Setting the XQuery Node Data Sources
      • Default and Specified Port Values
      • An Alternate Way to Create ConvertToXML Nodes
    • Testing the XML Pipeline
    • Setting a Value for an Output Port
    • Designing a Report from the XML Document
    • Adding XSLT and XQuery Transformations
    • Finishing Up
  • Working with Nodes
  • Working with the XML Pipeline Diagram
  • Debugging an XML Pipeline
  • Generating Code for an XML Pipeline
  • XML Pipeline Node Properties Reference
• Chapter 14: Publishing XML Data
• Chapter 15: Integrating with Third-Party File Systems
• Chapter 16: Extending Stylus Studio
• Chapter 17: The Stylus Studio Java API
• Chapter 18: Stylus Studio GUI Reference

Home > Online Product Documentation > Table of Contents > Setting the XQuery Node Data Sources

Setting the XQuery Node Data Sources

Although the XQuery code was specified with default data sources, we want the XQuery to use the data sources we defined in the two ConvertToXML nodes we created in Configuring Data Sources. We do this by connecting the output ports on the ConvertToXML nodes to the input ports on the XQuery node.

To set an XQuery node's data sources:

Stylus Studio creates a pipe connecting the two nodes, shown in Figure 406.

Figure 406. The XML Pipeline's First Pipe

Default and Specified Port Values

As you can see in Figure 406, an input port can have both a default value, and a value provided by another node's output port. Note, however, that an output port's default value is never used if a pipe is connected to the port - the pipe either supplies a value or it does not, but the default value is ignored.

An Alternate Way to Create ConvertToXML Nodes

It should be noted that when you add an XQuery or an XSLT document to an XML pipeline, Stylus Studio creates other nodes required to support the resulting XQuery or XSLT node, based on the XQuery or XSLT definition. For example, since createFullOrder.xquery was defined to use Stylus Studio's built-in converters to create XML data source documents, simply dragging and dropping the createFullOrder.xquery on the XML pipeline canvas would have automatically created the XQuery node and both ConvertToXML nodes, one for each data source specified in the XQuery code.

We will see this functionality in action later, when we add another XQuery document to the XML pipeline. (See Add createReport.xquery for more information.)