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Camunda BPMN Extension Attributes

The following attributes are extension attributes for the camunda namespace http://camunda.org/schema/1.0/bpmn.

assignee

Description	The attribute specifies a human performer of a User Task.
Type	`java.lang.String` or `org.camunda.bpm.engine.delegate.Expression`
Possible Values	The name of a performer as `java.lang.String` or an expression which evaluates to a `java.lang.String` e.g., `${initiator}`
Default Value	–
BPMN 2.0 Elements	User Task

asyncAfter

Description	Specifies an asynchronous continuation after an activity, see Asynchronous Continuations for more information.
Type	`java.lang.Boolean`
Possible Values	`true`, `false`
Default Value	`false`
BPMN 2.0 Elements	Start Events, End Events, Intermediate Throw Events, Intermediate Catch Events, Task, Service Task, Send Task, User Task, Business Rule Task, Script Task, Receive Task, Manual Task, Embedded Subprocess, Call Activity, Transaction Subprocess, Parallel Gateway, Inclusive Gateway, Exclusive Gateway, Multi Instance Loop Characteristics, Boundary Event, Message Boundary Event, Error Boundary Event, Timer Boundary Event, Escalation Boundary Event, Conditional Boundary Event, Signal Boundary Event, Cancel Boundary Event

asyncBefore

Description	Specifies an asynchronous continuation before an activity, see Asynchronous Continuations for more information.
Type	`java.lang.Boolean`
Possible Values	`true`, `false`
Default Value	`false`
BPMN 2.0 Elements	Start Events, End Events, Intermediate Throw Events, Intermediate Catch Events, Task, Service Task, Send Task, User Task, Business Rule Task, Script Task, Receive Task, Manual Task, Embedded Subprocess, Call Activity, Transaction Subprocess, Parallel Gateway, Event Based Gateway, Inclusive Gateway, Exclusive Gateway, Multi Instance Loop Characteristics, Boundary Event, Message Boundary Event, Error Boundary Event, Timer Boundary Event, Escalation Boundary Event, Conditional Boundary Event, Signal Boundary Event, Cancel Boundary Event

calledElementBinding

Description	The attribute specifies which process definition version of the subprocess the call activity calls. If the value is `version`, the attribute camunda:calledElementVersion is required. If the value is `versionTag`, the attribute camunda:calledElementVersionTag is required. See Called Element Binding for more information.
Type	`java.lang.String`
Possible Values	`latest`, `deployment`, `version`, `versionTag`
Default Value	–
BPMN 2.0 Elements	Call Activity

calledElementVersion

Description	The attribute specifies which process definition version of the subprocess the call activity calls if the camunda:calledElementBinding is set to `version`, see Called Element Binding for more information.
Type	`java.lang.Integer` or `org.camunda.bpm.engine.delegate.Expression`
Possible Values	A concrete version of all deployed version numbers of the subprocess to call as `java.lang.Integer` or an expression which evaluates to a `java.lang.Integer` e.g., `${versionToCall}`
Default Value	–
BPMN 2.0 Elements	Call Activity

calledElementVersionTag

Description	The attribute specifies which process definition version tag of the subprocess the call activity calls if the camunda:calledElementBinding is set to `versionTag`, see Called Element Binding for more information.
Type	`java.lang.String` or `org.camunda.bpm.engine.delegate.Expression`
Possible Values	A concrete version tag of all deployed version numbers of the subprocess to call as `java.lang.String` or an expression which evaluates to a `java.lang.String` e.g., `${versionTagToCall}`
Default Value	–
BPMN 2.0 Elements	Call Activity

calledElementTenantId

Description	The attribute specifies the tenant id of the process definition which is to be resolved by a call activity, see Called Element Tenant Id for more information.
Type	`java.lang.String` or `org.camunda.bpm.engine.delegate.Expression`
Possible Values	A concrete tenant id or an expression which evaluates to a `java.lang.String` e.g., `${execution.tenantId}`
Default Value	–
BPMN 2.0 Elements	Call Activity

candidateGroups

Description	The attribute specifies which group(s) will be candidate for performing the User Task.
Type	`java.lang.String` or `org.camunda.bpm.engine.delegate.Expression`
Possible Values	Comma separated list of group ids as `java.lang.String` or expressions that evaluate to a `java.lang.String` or a `java.util.Collection` of `java.lang.String`, e.g., `management` or `management, ${accountancyGroupId()}`
Default Value	–
BPMN 2.0 Elements	User Task

candidateStarterGroups

Description	The attribute specifies which group(s) will be able to start the process.
Type	`java.lang.String` or `org.camunda.bpm.engine.delegate.Expression`
Possible Values	Comma separated list of group ids as `java.lang.String` or expressions that evaluate to a `java.lang.String` or a `java.util.Collection` of `java.lang.String`, e.g., `management` or `management, ${accountancyGroupId()}`
Default Value	–
BPMN 2.0 Elements	Process

candidateStarterUsers

Description	The attribute specifies which user(s) will be able to start the process.
Type	`java.lang.String` or `org.camunda.bpm.engine.delegate.Expression`
Possible Values	Comma separated list of user ids as `java.lang.String` or expressions that evaluate to a `java.lang.String` or a `java.util.Collection` of `java.lang.String`, e.g., `kermit, gonzo` or `${ldapService.findAllSales()}`
Default Value	–
BPMN 2.0 Elements	Process

candidateUsers

Description	The attribute specifies which user(s) will be candidate for performing the User Task.
Type	`java.lang.String` or `org.camunda.bpm.engine.delegate.Expression`
Possible Values	Comma separated list of user ids as `java.lang.String` or expressions that evaluate to a `java.lang.String` or a `java.util.Collection` of `java.lang.String`, e.g., `kermit, gonzo` or `${ldapService.findAllSales()}`
Default Value	–
BPMN 2.0 Elements	User Task

caseBinding

Description	The attribute specifies which case definition version of the subcase the call activity calls. If the value is `version`, the attribute camunda:caseVersion is required, see Case Binding for more information.
Type	`java.lang.String`
Possible Values	`latest`, `deployment`, `version`
Default Value	–
BPMN 2.0 Elements	Call Activity

caseRef

Description	The attribute references a case definition by its key to call.
Type	`java.lang.String`
Possible Values	–
Default Value	–
BPMN 2.0 Elements	Call Activity

caseVersion

Description	The attribute specifies which case definition version of the subcase the call activity calls if the camunda:caseBinding is set to `version`, see Case Binding for more information.
Type	`java.lang.Integer`
Possible Values	All deployed version numbers of the subprocess to call
Default Value	–
BPMN 2.0 Elements	Call Activity

caseTenantId

Description	The attribute specifies the tenant id of the case definition which is to be resolved by a call activity, see Case Tenant Id for more information.
Type	`java.lang.String` or `org.camunda.bpm.engine.delegate.Expression`
Possible Values	A concrete tenant id or an expression which evaluates to a `java.lang.String` e.g., `${execution.tenantId}`
Default Value	–
BPMN 2.0 Elements	Call Activity

class

Description	The attribute specifies which Java class will be executed at runtime. The stated class must implement a Java delegate interface.
Type	`java.lang.String`
Possible Values	Fully qualified Java class name of a class which implements a Java Delegate interface, e.g., `org.camunda.bpm.MyJavaDelegate`
Default Value	–
BPMN 2.0 Elements	Service Task, Business Rule Task, Send Task, Message Event Definition of Message Intermediate Throwing Event or Message End Event, camunda:taskListener, camunda:executionListner

collection

Description	The attribute specifies a collection, where an instance will be created for each element, see Multiple Instance for more information.
Type	`java.lang.String` or `org.camunda.bpm.engine.delegate.Expression`
Possible Values	The name of a `java.util.Collection` process variable as `java.lang.String` or an Expression which evaluates to the name of a collection
Default Value	–
BPMN 2.0 Elements	Multi Instance Loop Characteristics of Task, Embedded Subprocess, Call Activity, Transaction Subprocess

decisionRef

Description	The attribute references a decision definition to evalute by its key.
Type	`java.lang.String` or `org.camunda.bpm.engine.delegate.Expression`
Possible Values	A String or an expression which evalutes to the key of a decision definition which should be evaluated by this task, e.g., `myDecisionDefinitionKey` or `${decisionKey}`
Default Value	–
BPMN 2.0 Elements	Business Rule Task

decisionRefBinding

Description	The attribute specifies which decision definition version the task evaluates. If the value is `version`, the attribute camunda:decisionRefVersion is required. If the value is `versionTag`, the attribute camunda:decisionRefVersionTag is required.
Type	`java.lang.String`
Possible Values	`latest`, `deployment`, `version`, `versionTag`
Default Value	`latest`
BPMN 2.0 Elements	Business Rule Task

decisionRefVersion

Description	The attribute specifies which decision definition version the task evaluates if the camunda:decisionRefBinding is set to `version`.
Type	`java.lang.Integer` or `org.camunda.bpm.engine.delegate.Expression`
Possible Values	A concrete version of all deployed version numbers of the decision to call as `java.lang.Integer` or an expression which evaluates to a `java.lang.Integer` e.g., `${versionToCall}`
Default Value	–
BPMN 2.0 Elements	Business Rule Task

decisionRefVersionTag

Description	The attribute specifies which decision definition version tag the task evaluates if the camunda:decisionRefBinding is set to `versionTag`.
Type	`java.lang.String` or `org.camunda.bpm.engine.delegate.Expression`
Possible Values	A concrete version tag of all deployed version tags of the decision to call as `java.lang.String` or an expression which evaluates to a `java.lang.String` e.g., `${versionTagToCall}`
Default Value	–
BPMN 2.0 Elements	Business Rule Task

decisionRefTenantId

Description	The attribute specifies the tenant id of the decision definition which is to be resolved by a business rule task, see DecisionRef Tenant Id for more information.
Type	`java.lang.String` or `org.camunda.bpm.engine.delegate.Expression`
Possible Values	A concrete tenant id or an expression which evaluates to a `java.lang.String` e.g., `${execution.tenantId}`
Default Value	–
BPMN 2.0 Elements	Business Rule Task

delegateExpression

Description	The attribute allows specification of an expression which must resolve to an object that implements the corresponding interface (see delegation code).
Type	`org.camunda.bpm.engine.delegate.Expression`
Possible Values	Expression which evaluates to a Java class implementing a delegation interface, e.g., `${myJavaDelegate}` or `#{myTaskListener}`
Default Value	–
BPMN 2.0 Elements	Service Task, Business Rule Task, Send Task, Message Event Definition of Message Intermediate Throwing Event or Message End Event, camunda:taskListener, camunda:executionListner

dueDate

Description	The attribute specifies the initial due date of a User Task when it is created.
Type	`org.camunda.bpm.engine.delegate.Expression`
Possible Values	An expression which evaluates to a `java.util.Date`, `java.util.String` (ISO 8601 formatted) or `null`, e.g., `${dateVariable}`
Default Value	–
BPMN 2.0 Elements	User Task

elementVariable

Description	The attribute specifies the process variable which will be set on each created instance, containing an element of the specified collection see Multiple Instance for more information.
Type	`java.lang.String`
Possible Values	The name of a process variable as `java.lang.String`
Default Value	–
BPMN 2.0 Elements	Multi Instance Loop Characteristics of Task, Embedded Subprocess, Call Activity, Transaction Subprocess

errorMessage

Description	The attribute specifies a message to give further information about the error. When an error start event or boudary event catches the error the message will be saved as process variable if `errorMessageVariable` is configured. See Error Events for more information.
Type	`java.lang.String`
Possible Values	The error message as`java.lang.String`
Default Value	–
BPMN 2.0 Elements	Error

errorCodeVariable

Description	The attribute specifies a process variable that holds the error code and the errorCodevariable will be set if an error has been received by the error start or boundary event, see Error Events for more information.
Type	`java.lang.String`
Possible Values	The name of a process variable as `java.lang.String`
Default Value	–
BPMN 2.0 Elements	Error Events

errorMessageVariable

Description	The attribute specifies a process variable that holds the error message and the errorMessageVariable will be set if an error has been received by the error start or boundary event, see Error Events for more information.
Type	`java.lang.String`
Possible Values	The name of a process variable as `java.lang.String`
Default Value	–
BPMN 2.0 Elements	Error Events

escalationCodeVariable

Description	The attribute specifies a process variable which will be set if an escalation has been received by an escalation start or boundary event, see Escalation Events for more information.
Type	`java.lang.String`
Possible Values	The name of a process variable as `java.lang.String`
Default Value	–
BPMN 2.0 Elements	Escalation Events

exclusive

Description	The attribute specifies that jobs should be executed exclusively. See Exclusive Jobs for more information.
Type	`java.lang.Boolean`
Possible Values	`true`, `false`
Default Value	`true`
BPMN 2.0 Elements	Start Events, End Events, Intermediate Throw Events, Intermediate Catch Events, Task, Service Task, Send Task, User Task, Business Rule Task, Script Task, Receive Task, Manual Task, Embedded Subprocess, Call Activity, Transaction Subprocess, Parallel Gateway, Event Based Gateway, Inclusive Gateway, Exclusive Gateway, Multi Instance Loop Characteristics, Boundary Event, Message Boundary Event, Error Boundary Event, Timer Boundary Event, Escalation Boundary Event, Conditional Boundary Event, Signal Boundary Event, Cancel Boundary Event

expression

Description	The attribute defines an expression which will be evaluated at runtime.
Type	`org.camunda.bpm.engine.delegate.Expression`
Possible Values	Expression, e.g., `${gender == 'male' ? 'Mr.' : 'Mrs.'}` or `#{printer.printMessage()}`
Default Value	–
BPMN 2.0 Elements	Service Task, Business Rule Task, Send Task, Message Event Definition of Message Intermediate Throwing Event or Message End Event, camunda:taskListener, camunda:executionListner

formHandlerClass

Description	The attribute specifies the class that will be called during the parsing of the form information of a Start Event or User Task.
Type	`java.lang.String`
Possible Values	Fully qualified Java class name of a class which implements the `org.camunda.bpm.engine.impl.form.handler.StartFormHandler` or `org.camunda.bpm.engine.impl.form.handler.TaskFormHandler` interface, e.g., `org.camunda.bpm.MyUserTaskFormHandler`
Default Value	–
BPMN 2.0 Elements	Initial Start Event of a Process, User Task

formKey

Description	The attribute specifies a form resource. See task forms for more information.
Type	`java.lang.String`
Possible Values	A `java.lang.String` of a form resource which can be evaluated by the Tasklist
Default Value	–
BPMN 2.0 Elements	Initial Start Event of a Process, User Task

historyTimeToLive

Description	The attribute specifies the history time to live (in days) for the process definition. It is used within History cleanup.
Type	`java.lang.Integer` or `java.lang.String`
Possible Values	Any non-negative integer number or string containing a time in days defined by the ISO-8601 date format.
Default Value	null - means that process definition history won't ever be removed during history cleanup run
BPMN 2.0 Elements	Process

initiator

Description	The attribute specifies a process variable in which the user id of the process initiator is set.
Type	`java.lang.String`
Possible Values	A process variable name to save the process initiator
Default Value	–
BPMN 2.0 Elements	Start Event of a Process

isStartableInTasklist

Description	The attribute specifies whether the process is startable in Tasklist or not.
Type	`java.lang.Boolean`
Possible Values	`true`, `false`
Default Value	`true`
BPMN 2.0 Elements	Process

jobPriority

Description	Specifies the priority a job receives that is created in the context of executing the given process element (e.g., a timer event, or in the case of asyncBefore and asyncAfter). See the user guide on Job Prioritization for details.
Type	A number in the range of a Java `long` value or `org.camunda.bpm.engine.delegate.Expression`
Possible Values	An expression must resolve to a valid Java `long` value.
Default Value	none
BPMN 2.0 Elements	Start Events, End Events, Intermediate Throw Events, Intermediate Catch Events, Task, Service Task, Send Task, User Task, Business Rule Task, Script Task, Receive Task, Manual Task, Embedded Subprocess, Call Activity, Transaction Subprocess, Parallel Gateway, Inclusive Gateway, Exclusive Gateway, Multi Instance Loop Characteristics, Process

mapDecisionResult

Description	The attribute references which built-in Decision Result Mapper is used to pass the result of an evaluated decision to a process variable. It should be used in combination with camunda:resultVariable.
Type	`java.lang.String`
Possible Values	singleEntry, singleResult, collectEntries, resultList
Default Value	resultList
BPMN 2.0 Elements	Business Rule Task

priority

Description	The attribute specifies the initial priority of a User Task when it is created.
Type	`org.camunda.bpm.engine.delegate.Expression`
Possible Values	An expression which evaluates to a `java.lang.Number` or a `java.lang.String` which represents a number or `null`, e.g., `${dateVariable}`
Default Value	–
BPMN 2.0 Elements	User Task

taskPriority

Description	The attribute specifies the initial priority of an External Task when it is created.
Type	A number in the range of a Java `long` value or `org.camunda.bpm.engine.delegate.Expression`
Possible Values	An expression must resolve to a valid Java `long` value.
Default Value	0
BPMN 2.0 Elements	Service Task, Message End Event, Message Intermediate Throwing Event, Business Rule Task, Send Task, Process

resource

Description	The attribute specifies an external resource. The resource can be part of the deployment or exists in the classpath. To specify the type of resource, a URL scheme like prefix `deployment://` resp. `classpath://` can be supplied. If the scheme is omitted, it is assumed that the resource exists in the classpath.
Type	`java.lang.String` or `org.camunda.bpm.engine.delegate.Expression`
Possible Values	The path to a resource or an expression which returns the path. Optional the path can start with an URL like scheme `classpath://` or `deployment://` to specify where to find the resource. If omitted the resource is assumed to exists in the classpath.
Default Value	–
BPMN 2.0 Elements	Script Task

resultVariable

Description	The attribute specifies the process variable to save the return value of a camunda:expression. Note that when you use `camunda:resultVariable` in a multi-instance construct, for example in a multi-instance subprocess, the result variable is overwritten every time the task completes, unless the variable is a local variable in the scope of the multi-instance construct. This can lead to seemingly random behavior. This is a known issue. As a workaround, a local variable can be declared by adding an execution listener to the subprocess' start event that initializes the variable as `null`.
Type	`java.lang.String`
Possible Values	The name of a process variable to save the return value
Default Value	–
BPMN 2.0 Elements	Service Task, Business Rule Task, Script Task, Send Task, Message Event Definition of Message Intermediate Throwing Event or Message End Event,

versionTag

Description	The attribute specifies a version tag for the process definition.
Type	`java.lang.String`
Possible Values	Any value that has a meaning as version tag for the process definition. Note: Sorting by versionTag is string based. The version will not be interpreted. As an example, the sorting could return v0.1.0, v0.10.0, v0.2.0.
Default Value	–
BPMN 2.0 Elements	Process

topic

Description	The attribute specifies the topic of an external task instance. The task is going to be offered to workers polling for that topic. It is only relevant when camunda:type is set to `external`.
Type	`java.lang.String` or `org.camunda.bpm.engine.delegate.Expression`
Possible Values	Any value that has a meaning as a topic identifier as `java.lang.String` or an expression which evaluates to a `java.lang.String`, e.g. `${topicName}`
Default Value	–
BPMN 2.0 Elements	Service Task, Message End Event, Message Intermediate Throwing Event, Business Rule Task, Send Task

type

Description	The attribute specifies which built-in task implementation to use. Currently an email, a shell service, and an external task exists.
Type	`java.lang.String`
Possible Values	`external`, `mail`, `shell`
Default Value	–
BPMN 2.0 Elements	Service Task, Message End Event, Message Intermediate Throwing Event, Business Rule Task, Send Task

variableMappingClass

Description	The attribute specifies which Java class will be executed at runtime to map the input and output variables for a call activity. The stated class must implement the Delegate Variable Mapping interface.
Type	`java.lang.String`
Possible Values	Fully qualified Java class name of a class which implements the Delegate Variable Mapping interface, e.g., `org.camunda.bpm.MyVariableMappingDelegate`
Default Value	–
BPMN 2.0 Elements	Call Activity

variableMappingDelegateExpression

Description	The attribute allows specification of an expression which must resolve to an object that implements the corresponding interface Delegate Variable Mapping.
Type	`org.camunda.bpm.engine.delegate.Expression`
Possible Values	Expression which evaluates to a Java class that implements the Delegate Variable Mapping interface, e.g., `${myVariableMapping}`.
Default Value	–
BPMN 2.0 Elements	Call Activity

variableName

Description	The attribute allows to specify a variable name on which a condition of a conditional event should be evaluated exclusively.
Type	`java.lang.String`
Possible Values	The name of a process variable on which a condition should be evaluated after a change happens.
Default Value	–
BPMN 2.0 Elements	Conditional Event

variableEvents

Description	The attribute allows to specify a comma separated list of variable change events. These events specify the variable change events on which a condition of a conditional event should be evaluated exclusively.
Type	`java.lang.String`
Possible Values	A comma separated list of variable change events. Variable change events are: create, update and delete.
Default Value	–
BPMN 2.0 Elements	Conditional Event

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