To create a predicate:

1. In the source tree pane, right-click a node (schema element or attribute) and choose New Predicate.

   The Predicate Editor appears.

2. Use XPath functions to create the condition for the predicate. Map the result to the predicate node in the destination tree pane.

3. Click OK.

   The editor adds the predicate node immediately below the original node. The condition appears in brackets.