The XPath Expression Builder dialog is accessed from the Condition, Source Attribute and Source Attribute Units fields of the main Attribute Mappings dialog. It is used to construct XPath expressions to populate these fields.

For more information on XPath expressions, refer to 20.3: Appendix C: XPath Expressions.

The dialog includes a Build tab, used to construct expressions (see Building Expressions), and a Preview tab which is used to test them (refer to Set up Mappings Using the XPath Expression Builder Dialog - Examples).