INVOKE

Executes a specified service.

MAP

Performs specified editing operations on the pipeline (such as mapping variables in the pipeline, adding variables to the pipeline, and dropping variables from the pipeline).

BRANCH

Executes a specified flow step based on the value of a specified variable in the pipeline.

LOOP

Executes a set of flow steps once for each element in a specified array.

REPEAT

Re-executes a set of flow steps up to a specified number of times based on the successful or non-successful completion of the set.

SEQUENCE

Groups a set of flow steps into a series. The SEQUENCE step is implicit in most flow services (that is, the steps in a flow service are treated as a series). However, at times it is necessary to explicitly group a subset of flow steps using SEQUENCE so that they can be treated as a unit.

EXIT

Controls the execution of a flow step (for example, abort an entire flow service from within a series of deeply nested steps, throw an exception without writing a Java service, or exit a LOOP or REPEAT without throwing an exception).