This is a screenshot showing the Data Mapper Tool with a mapping from one XML schema to another.

The data mapper tab is divided into three columns. The first column contains the source elements (labeled Source:), the second column (mapper pane) shows the mapping links between source and target elements (unlabeled), and the third column contains target elements (labeled Target:). The image shows elements in the first column joined to columns in the third column to indicate the mapping between source and target elements in the XSD files specified in the column names.