BPEL variables

Similar to Java, BPEL Variables are used to contain temporary data. A variable can either contain an XSD value or a WSDL message.

Oracle BPEL Process Manager has the following types of variables:

• XML schema type (Type)

• WSDL message type (Message Type)

• XML schema element (Element)

Message Type variables are used to hold data in interactions between the process and its partner services.

The BPEL variable holds the message data between a BPEL client, external services, and local data used by the BPEL process. The sample code for declaring a variable in BPEL is given as follows:

<variables>
  <variable   name="hello_world" 
              messageType="Type" />
</variables>

Each variable can be declared as a messageType or an element. As shown in the following screenshot, select an activity and click on (x) to edit the output and input variables.

Double-click on the input, output, or OnMessage variable to enter the details of the variable:

One kind of variable type can...