When you create a REST web service, the Developer tool creates the Output transformation based on the resource definition that you defined. The Developer tool creates input ports for the transformation based on the response message structure. The Output transformation contains a mapping that maps input ports to nodes in the response message.

You can change the elements in the output message hierarchy by changing the schema. You can change the input ports in the transformation to correspond to the schema changes.

View the REST response message hierarchy on the Output transformation

Ports

tab. You can choose to view the transformation ports or view the a mapping between the transformation input ports and the response message hierarchy.

When you show the ports, you can manually add groups and ports or you can copy ports from other transformations into the Output transformation. You can use keyboard shortcuts or you can use the copy and the paste buttons in the Developer tool.

When you show the output mapping, you can define input groups, define input ports, and map input ports to response message elements. The left side of the tab is the

Ports

area and the right side of the tab is the

Output

area. The

Output

area shows the response message hierarchy. Define input groups and ports in the

Ports

area. When you map the input ports from the

Ports

area to nodes in the

Output

area, the input port location appears in the

Location

column in the

Output

area.

When you show the output mapping, you can choose to view the lines that connect the input ports to the nodes in the operation input.

The following image shows a simple output mapping in an Output transformation:

In the previous image, the transformation receives one group of ports for a customer. It returns single-occurring elements.

The Developer tool maps input ports to nodes in the first level of the operation output when you choose to map the first level of the hierarchy. The

Map First Level Hierarchy

option is enabled by default. The Developer tool also creates the input ports that it requires to map the data. If the first level of the hierarchy contains a multi-occurring parent node with one or more multi-occurring child nodes, the Developer tool does not create the ports or map the first level of the hierarchy.