> ## Documentation Index > Fetch the complete documentation index at: https://docs.aseeflow.org/llms.txt > Use this file to discover all available pages before exploring further. # BPMN 2.0 Implementation Reference This page gives you an overview of the BPMN 2.0 elements and the current coverage of the process engine. **BPMN - Business Process Model and Notation** If you are unfamiliar with BPMN 2.0, you might want to check out the [BPMN Tutorial](https://camunda.com/bpmn/tutorial/) first. ## Coverage The elements marked in orange are supported. ### Symbols

Participants

Pool
Lane

Subprocesses

Subprocess [Embedded Subprocess](/reference/bpmn20/subprocesses/embedded-subprocess)
Call Activity [Call Activity](/reference/bpmn20/subprocesses/call-activity)
EventSubprocess [Event Subprocess](/reference/bpmn20/subprocesses/event-subprocess)
Transaction [Transaction Subprocess](/reference/bpmn20/subprocesses/transaction-subprocess)

Tasks

Service Task [Service Task](/reference/bpmn20/tasks/service-task)
User Task [User Task](/reference/bpmn20/tasks/user-task)
Script Task [Script Task](/reference/bpmn20/tasks/script-task)
Business RuleTask [Business Rule Task](/reference/bpmn20/tasks/business-rule-task)
Manual Task [Manual Task](/reference/bpmn20/tasks/manual-task)
Receive Task [Receive Task](/reference/bpmn20/tasks/receive-task)
Loop
Undefined Task
Send Task [Send Task](/reference/bpmn20/tasks/send-task)
Receive Task(instantiated)

Gateways

XOR [Exclusive Gateway](/reference/bpmn20/gateways/exclusive-gateway)
OR [Inclusive Gateway](/reference/bpmn20/gateways/inclusive-gateway)
AND [Parallel Gateway](/reference/bpmn20/gateways/parallel-gateway)
Event [Event Based Gateway](/reference/bpmn20/gateways/event-based-gateway)
Complex

Data

Data Object
Data Store

Artifacts

TextAnnotation
Group
### Events In BPMN there are start events, intermediate events and end events. These three event types can be catching events or throwing events. Intermediate events can be used as boundary events on tasks, in which case they can be interrupting or non-interrupting. This gives you a lot of flexibility to use events in your processes. **Understanding BPMN Events** To help understand the principle behavior of events in BPMN, we recommend to check the [Events: Basic Concepts](https://camunda.com/bpmn/reference/#events-basic-concepts) chapter of the [BPMN Modeling Reference](https://camunda.com/bpmn/reference/).
Type Start Intermediate End
Normal Event Subprocess Event Subprocess
non-interrupt 		catch boundary boundary
non-interrupt 		throw
[None](/reference/bpmn20/events/none-events)
[Message](/reference/bpmn20/events/message-events)
[Timer](/reference/bpmn20/events/timer-events)
[Conditional](/reference/bpmn20/events/conditional-events)
[Link](/reference/bpmn20/events/link-events)
[Signal](/reference/bpmn20/events/signal-events)
[Error](/reference/bpmn20/events/error-events)
[Escalation](/reference/bpmn20/events/escalation-events)
[Termination](/reference/bpmn20/events/terminate-event)
[Compensation](/reference/bpmn20/events/cancel-and-compensation-events)
[Cancel](/reference/bpmn20/events/cancel-and-compensation-events)
Multiple
Multiple Parallel