This image shows the mapper. In the upper left is the Map label. Below this are the Designer, Code, Test, and Recommend links, Below this are the Sources data structure. To the right is the Mapping Canvas section. To the right is the Target data structure. Above the Target data structure are the Advanced, View, and Filter links. To the right of this are four additional links. Source elements are mapped (connected) to target elements. A blue line indicates the mapping. Target elements with functions are highlighted in blue with a box. Below this is the Expression Builder section, which shows the function code (for this example, a concat function).