Testing a transformation expression

Test your XPath transformation expression created in a user-defined pattern to check that it works correctly.

To test your XPath expression:

1. If the Transform tab in the Edit Parameter window is not already open, complete the following steps to open the tab:
   1. In the Pattern Configuration tab of the Pattern Authoring editor, double-click the parameter containing the XPath expression that you want to test, or select the parameter and click Edit.
      The Edit Parameter window opens.
   2. Click the Transform tab.
2. To change the test value for a parameter, select the parameter in the Pattern Parameters section and enter the required test value in the Test value field. Click Set.
   The new test value is shown in the Pattern Parameters section.
3. To test the expression, click Evaluate.
   The expression is evaluated by using the values in the Test Values column of the Pattern Parameters section and the result is shown in the Result field. If the expression is not valid an error message is displayed in the Result field.
4. Repeat steps 2 and 3, as required, to test the XPath expression.
   If you want to modify the expression, see Transforming pattern parameters.
5. When you have finished testing the expression, click OK.
   The Edit Parameter window closes.