Editing BPMN (section)

=====Start Events=====
* There are six different Start events for starting a Process or a [[#Event_Sub-Process|Event Sub-Process]]. The [[#Event_Sub-Process|Event Sub-Process]] Start Events can be interrupting or Non-interrupting:
** [[#None_Start_Event|None/undefined/unspecified start event]]
** [[#Message_Start_Event|Message Start Event]]
** [[#Timer_Start_Event|Timer start event]]
** [[#Signal_Start_Event|Signal Start Event]]
** [[#Conditional_Start_Event|Conditional Start Event]]
** [[#Multiple_Start_Event|Multiple Start Event]] (one out of many events)
** [[#Parallel_Start_Event|Parallel Start Event]] (all out of many events)
* There are three additional interrupting [[#Event_Sub-Process|Event Sub-Process]] Start Events
** Escalation Start Event
** Error Start Event
** [[#Compensation_Start_Event|Compensation Start Event]]
* Since BPMN 2.0 there are two start gateways:
** [[#Event-based_Start_Gateway|Event-based Start Gateway]]
** [[#Parallel_Start_Event_Gateway|Event-based Parallel Start Gateway]]
* Start events are always catching.
* There can be more than one start event. For each event a separate process instance is started. There can also be none start event, but it's not recommended.
* There should be only one undefined start event.

======None Start Event======
* the None/undefined/unspecified start event represents normally the manual process start by an user
* if there are multiple None Start Events the naming is important if the Events are different or the same
* if there are multiple None Start Events in a Sub-Process only one triggered either by a targetRef attribut or by chance

======Message Start Event======

======Compensation Start Event======
* The Compensation Start Event MAY NOT be used for a top-level Process

======Timer Start Event======
* A specific time-date or a specific cycle (e.g., every Monday at 9am) can be set that will trigger the start of the Process.

======Signal Start Event======
* A Signal is for general communication within and across Process levels, across Pools and between Business Process Diagram
* There is a source but no specific intended target

======Conditional Start Event======
* triggered when condition becomes true
* triggered again when condition became false and then true again

======Multiple Start Event======
* starts if one out of many events occurs

======Parallel Start Event======
* several disjoint start events must occur once to create a process instance

======Event-based Start Gateway======
* no incoming sequence flow to gateway
* process instance will be start if one of the events of the outgoing path is catched
* a additional Event starts a new Process instance
* could be modelled with a None Start Event and following Event-based Gateway, but in this case a process instance is already there

======Event-based Parallel Start Gateway======
* all Events which in the sequence have to be there to start the Process