Source scenario — A scenario block that you export to create a block.

Scenario block— A block that you create from a scenario by selecting Scenario > Generate Block in the Apama Studio menu and then saving and building the project. Alternatively, you can select Export as Block from File > Export dialog.

Main scenario — A scenario that uses a scenario block.

Sub-scenario — A source scenario instance that a scenario block dynamically creates. When you use a scenario block in a main scenario, the scenario block manages sub-scenarios according to the rules you define in the main scenario. The operations a scenario block can perform on a sub-scenario include create, retrieve, commit, delete, delete all, iterate, and next.

Context instance — Also referred to as the context sub-scenario. This is the current sub-scenario. A scenario block can create any number of sub-scenarios. However, at any point in time, a main scenario can modify only the context instance. Certain operations make a particular sub-scenario the context instance. You can also set the value of the scenario block instance id parameter to the instance ID for a particular sub-scenario and then call the scenario block retrieve operation to make that sub-scenario the context instance.