This image shows the mapper. In the upper left are the View list, Filter button, Detatch button, and Map button. Below this is the Source element tree. To the right is the Find field and button. To the right of the Source element tree is the Mappings column. To the right of this is the Target element tree, which includes the View list, Filter button, and Detach button at the top. Below this are the Find field and button, and Map button.
The Source element tree includes $jobId element, which has been mapped to the jobId element in the Target tree.