标记

Markers annotate BPMN tasks and call activities to convey intent, such as repetition or compensation. In Maestro, markers are for modeling clarity, except multi‑instance, which Maestro interprets at runtime.

多实例标记

Use a multi‑instance marker when an activity should run once per item in a collection (list or array).

类型	What it means	Runtime note
顺序	One item at a time, in order.	Preserves order; next item starts after the previous finishes
并行	Many items at once.	Items run concurrently. Order is not guaranteed.

Important: The task or call activity annotated with a multi‑instance marker must reference a collection (a variable or an expression that evaluates to a list). If the activity returns a result per item and you need a single combined output, configure Aggregation to combine those results (for example, collect as a list or reduce with an expression).

并行多实例

任务以并行方式执行，等待所有运行成功完成后，才会继续执行流程的其余部分。

顺序多实例

任务逐个执行列表中的每个项目，等待每个项目成功完成后，才会开始执行下一个项目。完成所有任务后，流程的其余部分将继续执行。

补偿标记

Marks an activity as eligible for compensation (undo logic) in the diagram. Maestro does not execute compensation automatically at runtime. Implement any undo logic explicitly in your model.

建模指导

• Use markers to clarify design intent, especially for stakeholders who are not aware of execution constraints.
• Only the multi‑instance marker changes runtime behavior in Maestro; other markers are visualization aids.
• Document the loop logic and any compensation approach elsewhere in the process model.
• Prefer named collections and clear item schemas to improve readability.

Read Multi‑instance implementation for how to configure and run multi‑instance work.

For more details about the BPMN elements supported in Maestro, read BPMN support.