This image shows the Expression Builder window. The Expression section displays at the top. Three icons display in the upper right corner. The Schema section displays in the lower left. This section includes the Variables navigation tree. The Functions section displays in the lower right. In the far lower left corner is the Content Preview section, which displays the selections you make in the Functions or Schema section. Below the Functions section is the Description section. This section displays descriptions of the selection you make in the Functions section.