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

connector

Description	The configuration of a Operaton connector.
Attributes	–
Constraints	The operaton:connectorId child element is required and must identify a connector implementation known to the process engine
Parent elements	Service Task, Business Rule Task, Send Task, Message Event Definition of Message Intermediate Throwing Event or Message End Event,
Child elements	operaton:inputOutput, operaton:connectorId

connectorId

Description	The unique identifier of the connector type to instantiate.
Attributes	–
Constraints	The connector type has to be known to the process engine
Parent elements	operaton:connector
Child elements	–

constraint

Description	Metadata of an individual validation constraint for a form field (see Form Field Validation).
Attributes	name	The name of the form field constraint type
	config	The configuration of the form field constraint type
Constraints	The name attribute must be one of the known validators (required, minlength, maxlength, min, max, readonly or validator)
Parent elements	operaton:validation
Child elements	–

entry

Description	A single entry of a map structure. The value can be a constant, expression, script, list or another map.
Attributes	key	The key of the entry in the map. Can be a string or an expression.
Constraints	The key attribute is required
Parent elements	operaton:map
Child elements	operaton:list, operaton:map, operaton:script

errorEventDefinition

Description	Definition of an error event that can be triggered by an expression. This element extends the errorEventDefinition element from the bpmn namespace inheriting all of its attributes: id, errorRef
Attributes	expression	An expression that will trigger the error if it evaluates to true.
Constraints	The errorRef attribute is required
Parent elements	Service Task of type external
Child elements	–

executionListener

Description	Add an execution listener to an event.
Attributes	event	The type of the event for which the listener is called
	class	see operaton:class
	expression	see operaton:expression
	delegateExpression	see operaton:delegateExpression
Constraints	The event attribute is required (except for transitions) and must be one of the task events: start or end
	One of the attributes class, expression or delegateExpression is mandatory
Parent elements	Process, Task, Service Task, Send Task, User Task, Business Rule Task, Script Task, Receive Task, Manual Task, Exclusive Gateway, Sequence Flow, Parallel Gateway, Inclusive Gateway, Event Based Gateway, Start Event, Intermediate Catch Event, Intermediate Throw Event, End Events, Boundary Events, Embedded Subprocess, Call Activity, Event Subprocess, Transaction Subprocess
Child elements	operaton:field, operaton:script

expression

Description	Defines an expression to inject in delegated classes (see Field Injection).
Attributes	–
Text Content	The expression to inject
Constraints	–
Parent elements	operaton:field
Child elements	–

failedJobRetryTimeCycle

Description	Defines the custom retry schedule for a failed job (see Failed Jobs).
Attributes	–
Text Content	The retry time cycle value or expression
Constraints	The configuration follows the ISO 8601 standard for repeating time intervals
Parent elements	Task, Service Task, Send Task, User Task, Business Rule Task, Script Task, Receive Task, Timer Start Event, Timer Intermediate Catching Event, Timer Boundary Event, Intermediate Signal Throw Event, Embedded Subprocess, Call Activity, Transaction Subprocess, Multi Instance Loop Characteristics
Child elements	–

field

Description	Defines the value to inject in delegated classes (see Field Injection).
Attributes	name	The name of the field
	expression	The value of the field as expression
	stringValue	The value of the field as String
Constraints	Only one attribute of stringValue and expression or one of the child elements string and expression can be used
Parent elements	Service Task, Business Rule Task, Send Task, Message Event Definition of Message Intermediate Throwing Event or Message End Event, operaton:taskListener, operaton:executionListner
Child elements	operaton:expression, operaton:string

formData

Description	Metadata to define fields of a form, which are used to generate task forms (see Generated Task Forms).
Attributes	–
Constraints	–
Parent elements	Start Event, User Task
Child elements	operaton:formField

formField

Description	Metadata to define a single form field (see Generated Task Forms).
Attributes	id	The id of the form field, corresponding to the name of a process variable
	label	The label to be displayed next to the form field
	type	The type of the form field
	datePattern	The pattern of a date type form field
	defaultValue	The value to be used as a default (pre-selection) for the field
Constraints	The attribute id may not be empty
	The attribute type can be one of the known form field types (string, long, boolean, date or enum) or a custom one
	The attribute datePattern can only be used if the type attribute is set to date
	The child element operaton:properties is only allowed once
	The child element operaton:validation is only allowed once
	The child elements operaton:values can only be used if the type attribute is set to enum
Parent elements	operaton:formData
Child elements	operaton:properties, operaton:validation, operaton:value

formProperty

Description	Metadata to define a form field (Deprecated, use operaton:formData).
Attributes	id	The key used to submit the property through the API
	name	The display label of the property
	type	The type of the property
	required	True if the form field is required (default: false)
	readable	True if the form field is readable and will be displayed (default: true)
	writeable	True if the form field is writeable (default: true)
	variable	Specifies the process variable on which the variable is mapped
	expression	Specifies an expression that maps the property, e.g., ${street.address}
	datePattern	The pattern of a date type form field
	default	The default value or expression of the property
Constraints	The id attribute is required
	The attribute type can be one of the known types (string, long, boolean, date or enum) or a custom one
	The attribute datePattern can only be used if the type attribute is set to date
	The child elements operaton:values can only be used if the type attribute is set to enum
Parent elements	Start Event, User Task
Child elements	operaton:value

in

Description	The element specifies variables which should be passed to the subprocess, see passing variables for more information.
Attributes	source	A name of a process variable to be passed in
	sourceExpression	An expression to be evaluated and passed in
	variables	Can be set to all to pass all process variables in
	target	Name of the process variable inside the subprocess instance
	local	Can be set to true to only pass local variables of the execution that executes the call activity.
	businessKey	Set the business key of the subprocess process instance
Constraints	Only one of the attributes source, sourceExpression, variables or businessKey can be used
	The attribute target is required if the source or sourceExpression attribute is used
Parent elements	Call Activity, Signal Events (in Intermediate and End Throwing Events)
Child elements	–

inputParameter

Description	An single input mapping for the activity. If the element has no child element, the text content of this element is mapped into the activity. The text content can be a constant string value or an expression. If no child element or text content exists, the variable inside the activity is set to the special value null.
Attributes	name	The name of the variable inside the activity.
Constraints	The name attribute is required.
	The element can have one child element, a constant string or an expression as text content.
Parent elements	operaton:inputOutput
Child elements	operaton:list, operaton:map, operaton:script

inputOutput

Description	The element describes an input/output mapping for the activity.
Attributes	–
Constraints	–
Parent elements	All Tasks, All Events (except Start and Boundary Events), Call Activity, Embedded Subprocess, Transaction Subprocess, operaton:connector
Child elements	operaton:inputParameter, operaton:outputParameter

list

Description	A list structure. If the list contains multiple values, they should be added as text content of child elements. Which child elements are used is arbitrary, e.g.,: <operaton:list>   <operaton:value>one</operaton:value>   <operaton:value>two</operaton:value>   <operaton:value>three</operaton:value> </operaton:list> A operaton:script element can also be used as a list element. The return value of the script is added to the list. Furthermore, lists can contain nested lists and maps.
Attributes	–
Constraints	Multiple values have to be encapsulated in child elements.
Parent elements	operaton:inputParameter, operaton:outputParameter, operaton:list, operaton:entry
Child elements	Any child element, operaton:list, operaton:map

map

Description	A map structure. The entries can be constants, expressions, scripts, nested maps and lists.
Attributes	–
Constraints	–
Parent elements	operaton:inputParameter, operaton:outputParameter, operaton:list, operaton:entry
Child elements	operaton:entry

out

Description	The element specifies variables which should be passed back from the subprocess, see passing variables for more information.
Attributes	source	A name of a process variable to be passed back
	sourceExpression	An expression to be evaluated and passed back
	variables	Can be set to all to pass all subprocess variables back
	target	Name of the process variable inside the subprocess instance
	local	Can be set to true to pass variables from the called case/process instance to local variables of the execution executing the call activity.
Constraints	Only one of the attributes source, sourceExpression or variables can be used
	The attribute target is required if the source or sourceExpression attribute is used
Parent elements	Call Activity
Child elements	–

outputParameter

Description	An single output mapping for the activity. If the element has no child element, the text content of this element is mapped out of the activity. The text content can be a constant string value or an expression. If no child element or text content exists, the variable outside of the activity is set to the special value null.
Attributes	name	The name of the variable outside of the activity.
Constraints	The name attribute is required.
	The element can have one child element, a constant string or an expression as text content.
Parent elements	operaton:inputOutput
Child elements	operaton:list, operaton:map, operaton:script

potentialStarter

Description	Defines which users or groups can start the process.
Attributes	–
Constraints	–
Parent elements	Process
Child elements	resourceAssignmentExpression

properties

Description	A key value list of properties which be can be interpreted freely.
Attributes	–
Constraints	–
Parent elements	Base Element, operaton:formField
Child elements	operaton:property

property

Description	A key value pair which can be interpreted freely.
Attributes	id	The id of the form field property
	name	The name of the property
	value	The value of the property
Constraints	If the property belongs to a operaton:formField extension element, only the attributes id and value are used.
	If the parent operaton:properties element is directly added as an extension element, for example by the Camunda Modeler, only the attributes name and value are used.
Parent elements	operaton:properties
Child elements	–

script

Description	A script element. The script is executed and the return value is used as mapping value.
Attributes	scriptFormat	The format identifier, normally the language of the script source code
	resource	equivalent to operaton:resource
Constraints	The scriptFormat attribute is required
	If the resource attribute is used, no source code text content is allowed
Parent elements	operaton:inputParameter, operaton:outputParameter, operaton:entry, operaton:list, operaton:executionListener, operaton:taskListener
Child elements	–

string

Description	Defines a String value to inject in delegated classes (see Field Injection).
Attributes	–
Text Content	The String value to inject
Constraints	–
Parent elements	operaton:field
Child elements	–

taskListener

Description	Adds a task listener to a task event.
Attributes	event	The type of the event for which the listener is called
	class	see operaton:class
	expression	see operaton:expression
	delegateExpression	see operaton:delegateExpression
	id	The id of the task listener in the parent scope, only required when event is set to timeout
Constraints	The event attribute is required and must be one of the task events: create, assignment, update, complete, delete or timeout
	One of the attributes class, expression or delegateExpression is mandatory
	If the attribute event is set to timeout, the attribute id and exactly one child element of type timerEventDefinition are mandatory
Parent elements	User Task
Child elements	operaton:field, operaton:script, timerEventDefinition

validation

Description	Metadata to define a list of validation constraints for form fields (see Form Field Validation).
Attributes	–
Constraints	–
Parent elements	operaton:formField
Child elements	operaton:constraint

value

Description	Possible values of a form field with the type enum.
Attributes	id	The id of the value
	name	The name of the value
Constraints	–
Parent elements	operaton:formField, operaton:formProperty
Child elements	–