GatewaysDataAttaching a data object with anUndirectedAssociationto a sequence flow indicates hand-overof information between the activities involved.ADirected Associationindicates information flow.A data object can be read at the start of anactivity or written upon completion.ABidirected Associationindicates that the dataobject is modified, i.e. read and written during theexecution of an actvity.AData Objectrepresents information flowingthrough the process, such as business documents,e-mails or letters.EventsTransactionsSwimlanesactivityStart Event: Catching an eventstarts a new process instance.Intermediate Event (catching):The process can only continueonce an event has been caught.Attached Intermediate Event: Theactivity is aborted once an event iscaught.Intermediate Event (throwing):An event is thrown and the processcontinues.End Event: An event is thrownwhen the end of the process isreached.StartEndIntermediatePlainMessageTimerErrorCancelCompen-sationConditionalLinkSignalMultipleTerminateCatchingThrowingUntyped events, typicallyshowing where the processstarts or ends.Receiving and sendingmessages.Cyclic timer events, points intime, time spans or timeouts.Catching or throwing namederrors.Reacting to cancelledtransactions or triggeringcancellation.
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Business process modeling, Business Process Modeling Notation, Conditional Flow