1. Developing SOA Applications with Oracle SOA Suite
  2. Sharing Functionality Across Service Components
  3. Creating Transformations with the XSLT Map Editor
  4. Editing an XSLT Map in Map View
  5. How to Add an XSLT Statement
  6. How to Add Conditional Processing Using xsl:if

How to Add Conditional Processing Using xsl:if

If a source and target node are optional in their respective schemas, the xsl:if statement is often used to test for the existence of the source node before creating the corresponding target node.

In Figure 41-11, the Comment node is optional for both the source and the target. The square brackets around the Comment nodes indicate that they are optional nodes.

Figure 41-11 Optional Nodes in Source and Target Trees

Description of Figure 41-11 follows
Description of "Figure 41-11 Optional Nodes in Source and Target Trees"

If the source Comment node does not exist in the source document at runtime, its value is empty. This creates a Comment node in the target document and sets its value to empty.

To prevent creating an empty node when the source node is not there, add an xsl:if statement above the target Comment node. The xsl:if statement tests for the existence of the source node before creating the target node.