Is the following statement about workflows and sub-workflows (subprocesses) true?

Yes. In IdentityIQ workflow XML, subprocess calls can exchange data with the calling workflow through configured input and output variable handling. The send attribute is used to pass variables into the subprocess, while the returns attribute identifies variables that should be returned from the subprocess to the parent workflow context. This is important when a reusable subprocess performs initialization, provisioning-plan generation, identity-request creation, approval preparation, or other common logic and the parent workflow needs the resulting values. In the example, identityName and plan are sent into the subprocess, while identityRequestId and project are expected back. This is a valid workflow pattern and is one reason standard LCM subprocesses can be reused in custom workflows. The engineer must still ensure that variable names match and the subprocess actually sets the returned variables. References/topics: IdentityIQ Engineer — workflow subprocesses, send attribute, returns attribute, workflow variables, reusable LCM workflows.