Workflow modifiers

How to write a workflow with modifiers?

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Modifiers

Construct	Modifier	Domain	Description	Default
Workflow			`Examples:` `<Workflow` `Limit="1"` `Live="1"` `Timeout="-1">...</Workflow>` `<Workflow` `Limit="5"` `Live="2"` `Timeout="PT3M">...</Workflow>`
	Limit	-1..n	The maximum number of workflow instances of the same model waiting at any given time (they are pre-created instances existing in the buffer)	10
	Live	-1..n	The maximum number of workflow instances of the same model allowed to run (in parallel) at the same time. (For example, a workflow receives inputs of X value and Y value and calculates X+Y=Z. When the first X and Y values are received, a workflow instance starts the process of calculation. While the calculation is taking 1 second to complete, a new set of X and Y values are received before the current instance is completed. Therefore a new workflow instance will start calculating X+Y from the new values. These two instances are running in parallel	10
	Timeout	-1..n	The period of time of inactivity after which a workflow instance is considered dead and removed from the buffer. Both XSD time period format and plain number of milliseconds are allowed. Timeout = "-1" means the workflow will never time out.	PT1M

Task			`Examples:` `<Task` `name="Main"` `while="true">...</Task>`
	While	true, false	Logical expression for repeatable tasks (only true/false is currently supported) (if false use variable not streams)	false
			`Examples:` `<Invoke` `name="InvokeSerialRead"` `waitFor="Argument"` `get="perif://">...</Invoke>` `<Invoke name="SetState" Skipif="[%:[:AA:].State/no-value(Value):%]" WaitFor="ActionArgument" Delay="PT5S">...</Invoke>`
Invoke
	SkipIf (skip-if)	true, false	A logical expression to skip the invoke execution (mutually exclusive with OnlyIf) - output will be null
	OnlyIf (only-if)	true, false	A logical expression to execute invoke conditionally (mutually exclusive with SkipIf)
	Delay	Duration	Synonym for DelayBefore (mutually exclusive with DelayUntil, Timeout)
	DelayBefore	Duration	Invoke execution delay interval (delay before invoke starts executing) - Mutually exclusive with Timeout and DelayUntil
	DelayAfter	Duration	Time to wait after invoke completed for the next invoke in the same task to start
	DelayUntil	DateTime	Absolute invoke execution time (Mutually exclusive with DelayBefore and Timeout)
	Get	URI
	Post	URI
	Put	URI
	Delete	URI
	WaitFor		A logical expression of possibly multiple outputs/events
	Timeout	Duration	Invoke type dependent hint. Different invoke types may interpret it differently (Mutually exclusive with Delay and DelayUntil) - only relevant if handler understands it, maybe not be in use currently (synonym of delay), use delay instead
	Unless	Name of the Output from another task	Delay termination output/event. Usually used with timeout/delay