ObjectNode

The stereotype applies to all parameters corresponding to the pins notated by the object node.

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OMG Systems Modeling Language (SysML) 1.6

Stereotypes applying to parameters can appear on object nodes in activity diagrams, as shown in Figure 11-7, when the object node notation is used as a shorthand for pins.

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OMG Systems Modeling Language (SysML) 1.6

SysML Activity extension stereotypes - REFERENCE CARD

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11:01: [STUB] Activity modelling extensions in SysML

Slide kind

UML Profile Diagram

The stereotype does not override UML token offering semantics, just indicates what happens to the token when it is accepted. When the stereotype is not applied, the semantics is as in UML, specifically, tokens arriving at object nodes do not replace ...

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OMG Systems Modeling Language (SysML) 1.6

For object nodes that are the target of continuous flows, «overwrite» and «nobuffer» have the same effect.

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OMG Systems Modeling Language (SysML) 1.6

The number of tokens replaced is equal to the weight of the incoming edge, which defaults to 1.

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OMG Systems Modeling Language (SysML) 1.6

A null token removes all the tokens already there.

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OMG Systems Modeling Language (SysML) 1.6

Tokens arriving at a full object node with the Overwrite stereotype applied take up their positions in the ordering as normal, if any. The arriving tokens do not take the positions of the removed tokens.

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OMG Systems Modeling Language (SysML) 1.6

For upper bounds greater than one, the token removed is the one that has been in the object node the longest. For FIFO ordering, this is the token that is next to be selected, for LIFO it is the token that would be last to be selected.

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OMG Systems Modeling Language (SysML) 1.6

This is typically used on an input pin with an upper bound of 1 to ensure that stale data is overridden at an input pin.

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OMG Systems Modeling Language (SysML) 1.6

When the «overwrite» stereotype is applied to object nodes, a token arriving at a full object node removes one that is already there before being added (a full object node has as many tokens as allowed by its upper bound).

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OMG Systems Modeling Language (SysML) 1.6

NoBuffer::1_not_overwrite The «nobuffer» and «overwrite» stereotypes cannot be applied to the same element at the same time

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OMG Systems Modeling Language (SysML) 1.6

The stereotype does not override UML token offering semantics; it just indicates what happens to the token when it is accepted. When the stereotype is not applied, the semantics are as in UML, specifically, tokens arriving at an object node ...

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OMG Systems Modeling Language (SysML) 1.6

For object nodes that are the target of continuous flows, «nobuffer» and «overwrite» have the same effect.

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OMG Systems Modeling Language (SysML) 1.6

This is typically used with fast or continuously flowing data values, to prevent buffer overrun, or to model transient values, such as electrical signals.

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OMG Systems Modeling Language (SysML) 1.6

When the «nobuffer» stereotype is applied to object nodes, tokens arriving at the node are discarded if they are refused by outgoing edges, or refused by actions for object nodes that are input pins.

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OMG Systems Modeling Language (SysML) 1.6

When the «probability» stereotype is applied to edges coming out of decision nodes and object nodes, it provides an expression for the probability that the edge will be traversed. These shall be between zero and one inclusive, and add up to one ...

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OMG Systems Modeling Language (SysML) 1.6

UML2 Types of Pins - metaclasses

This content has been marked as discussing an ADVANCED topic!

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Tutorial

TRAIL: Webel's ultimate guide to Systems Modeling Language (v1) with MagicDraw/Cameo

Section

01:04: UML Behavior: Activities quick start

Slide kind

UML Profile Diagram

When an Action in an Activity completes execution, object tokens for output data placed on its OutputPins may be offered on any outgoing ObjectFlows from those Pins ... In addition, control tokens shall be offered on any outgoing ControlFlows ...

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Unified Modeling Language 2.5.1

ObjectNodes hold object tokens accepted from incoming ObjectFlows and may subsequently offer them to outgoing ObjectFlows (with a modeler-specified exception for ControlFlows, see isControlType for ObjectNodes ...).

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Unified Modeling Language 2.5.1

There are three kinds of ActivityNodes:

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Unified Modeling Language 2.5.1

Unlike ControlFlows, ObjectFlows also provide additional support for multicast/receive, token selection from ObjectNodes and transformation of tokens

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Unified Modeling Language 2.5.1

A ControlFlow is an ActivityEdge that only passes control tokens (and some object tokens as specified by modelers, see isControlType for ObjectNodes ...).

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Unified Modeling Language 2.5.1

The effect of object tokens accepted from ControlFlows is not specified (see isControlType for ObjectNodes ...), but the semantics above applies if the effect is to execute the ExecutableNode.

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Unified Modeling Language 2.5.1

An ExecutableNode may also consume and produce data, but it must do so through related ObjectNodes (Actions use Pins for this purpose ...

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Unified Modeling Language 2.5.1

Generally, the ControlNodes and ObjectNodes in an Activity are largely there to control the sequencing and to manage the flow of data between the ExecutableNodes of the Activity.

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Unified Modeling Language 2.5.1

uml101 - Activity Diagram - notation - REFERENCE CARD

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Tutorial

TRAIL: Webel's ultimate guide to Systems Modeling Language (v1) with MagicDraw/Cameo

Section

01:04: UML Behavior: Activities quick start

Slide kind

UML Activity Diagram

AdjunctProperty for CallBehaviorAction and ObjectNode

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Section

11:02: Activity Decomposition for functional allocation

Slide kind

SysML Block Definition Diagram (BDD)

Figure 15-9: Allocation Matrix showing Allocation for Hybrid SUV Accelerate Example

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Tutorial

TRAIL: The SysML-1.6 Hybrid SUV sample and specification diagrams in MagicDraw/Cameo (with annotations) [UNDERGOING UPDATE to SysML1.7]

Section

Section: SysML-1.6 specification diagrams: 15 Allocations

Slide kind

MagicDraw/Cameo: relationship dependency matrix

In an instance of Operating Car, which is one execution of it, instances of Brake Pressure and Modulation Frequency are linked to the execution instance when they are in the object nodes of the activity.

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OMG Systems Modeling Language (SysML) 1.6

Figure 11-14 shows a block definition diagram with composition associations between the activity in Figure 11-10 and the types the object nodes in that activity, with AdjunctProperty applied to the object node type end.

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OMG Systems Modeling Language (SysML) 1.6

Figure 11-14: Example block definition diagram for object node types

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Tutorial

TRAIL: The SysML-1.6 Hybrid SUV sample and specification diagrams in MagicDraw/Cameo (with annotations) [UNDERGOING UPDATE to SysML1.7]

Section

Section: SysML-1.6 specification diagrams: 11 Activities

Slide kind

SysML Block Definition Diagram (BDD)

object_nodes ControlFlows may not have ObjectNodes at either end, except for ObjectNodes with control type.

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Unified Modeling Language 2.5.1

ObjectNode::upperBound : ValueSpecification [0..1] The maximum number of tokens that may be held by this ObjectNode. Tokens cannot flow into the ObjectNode if the upperBound is reached. If no upperBound is specified, then there is no limit on how many ...

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Unified Modeling Language 2.5.1

ObjectNode::selection : Behavior [0..1] ... A Behavior used to select tokens to be offered on outgoing ActivityEdges.

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Unified Modeling Language 2.5.1

ObjectNode::ordering : ObjectNodeOrderingKind [1..1] = FIFO Indicates how the tokens held by the ObjectNode are ordered for selection to traverse ActivityEdges outgoing from the ObjectNode.

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Unified Modeling Language 2.5.1

Figure 11-8: Abstract Syntax for SysML Activity Extensions

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Tutorial

TRAIL: The SysML-1.6 Hybrid SUV sample and specification diagrams in MagicDraw/Cameo (with annotations) [UNDERGOING UPDATE to SysML1.7]

Section

Section: SysML-1.6 specification diagrams: 11 Activities

Slide kind

UML Profile Diagram

Figure 11-5: Block definition diagram with activities as blocks associated with types of object nodes, variables, and parameter

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Tutorial

TRAIL: The SysML-1.6 Hybrid SUV sample and specification diagrams in MagicDraw/Cameo (with annotations) [UNDERGOING UPDATE to SysML1.7]

Section

Section: SysML-1.6 specification diagrams: 11 Activities

Slide kind

SysML Activity Diagram

SysML Block Definition Diagram (BDD)

The associations may be composition if the intention is to delete instances of the classifier flowing the activity when the activity is terminated. See example in 11.4, Usage Examples.

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OMG Systems Modeling Language (SysML) 1.6

Like any association end or property these can be the subject of parametric constraints, design values, units, and quantity kinds.

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OMG Systems Modeling Language (SysML) 1.6

Properties with AdjunctProperty applied, where the principal of the AdjunctProperty is an object node, variable, or parameter, can be used as the end of the associations toward the object node, variable, or parameter type.

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OMG Systems Modeling Language (SysML) 1.6

This supports linking the execution of the activity with items that are flowing through the activity or assigned to variables or parameters, and happen to be contained by an object node or assigned to a variable or parameter at the time the link exists.

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OMG Systems Modeling Language (SysML) 1.6

Associations can be used between activities and classifiers (blocks or value types) that are the type of object nodes, variables, or parameters in the activity, as shown in Figure 11-5.

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OMG Systems Modeling Language (SysML) 1.6

Activities in block definition diagrams can also appear with the same notation as CallBehaviorAction, except the rake notation can be omitted, if desired. Also see use of activities in block definition diagrams that include ObjectNodes.

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OMG Systems Modeling Language (SysML) 1.6

SysML-1.6: The allocation from ObjectNode 'driveCurrent' in Figure D.38 to itemFlow 'i1' on the Connector in Figure D.39 does not appear in the allocation table Figure D.40; Instead there is an allocation from an ObjectFlow 'o6' to the Connector 'epc-emg'

Multiple arrows coming out of a standalone Pin rectangle is an optional notation for multiple edges coming out of an OutputPin.

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Unified Modeling Language 2.5.1

The standalone Pin in the notation maps to an OutputPin and an InputPin and one ObjectFlow edge between them in the underlying model. This form should be avoided if the Pins are not of the same type.

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Unified Modeling Language 2.5.1

The situation in which the OutputPin of one Action is connected to the InputPin of the same name in another Action via an ObjectFlow may be shown by the optional notations of Figure 16.6.

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Unified Modeling Language 2.5.1

An object flow is notated by an arrowed line. In Figure 15.9, upper right, the two object flow arrows denote a single object flow edge between two pins in the underlying model, as shown in the lower middle of the figure.

Source

Unified Modeling Language 2.5.1

In the Webel trail versions of the SysML-1.6 spec sample Figure D.38, the alignment of ObjectNode symbols over the ActivityParameterNode boundaries is completely contrived, please DO NOT mimic it; please use explicit Pins instead!

Figure D.38 - Detailed Behavior Model for “Provide Power” {EXPLICIT PINS}

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Tutorial

TRAIL: The SysML-1.6 Hybrid SUV sample and specification diagrams in MagicDraw/Cameo (with annotations) [UNDERGOING UPDATE to SysML1.7]

Section

Section: SysML-1.6: HSUV sample

Slide kind

SysML Activity Diagram

Figure D.38 ... It also uses AllocateActivityPartitions and an allocation callout to explicitly allocate activities and an object flow to parts in the PowerSubsystem block.

Source

OMG Systems Modeling Language (SysML) 1.6

Figure D.38 shows the ProvidePower activity, which includes Actions invoking the decomposed Activities and ObjectNodes from Figure D.37.

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OMG Systems Modeling Language (SysML) 1.6

Figure D.38 - Detailed Behavior Model for “Provide Power” {ELIDED PINS}

Gallery

Tutorial

TRAIL: The SysML-1.6 Hybrid SUV sample and specification diagrams in MagicDraw/Cameo (with annotations) [UNDERGOING UPDATE to SysML1.7]

Section

Section: SysML-1.6: HSUV sample

Slide kind

SysML Activity Diagram

These two extensions are useful for ensuring that the most recent information is available to actions by indicating when old values should not be kept in object nodes, and for preventing fast or continuously flowing values from collecting ...

Source

OMG Systems Modeling Language (SysML) 1.6

SysML also extends object nodes with the option to discard values if they do not immediately flow downstream (see NoBuffer in Figure 11-8).

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OMG Systems Modeling Language (SysML) 1.6

Extension of object nodes, including pins, with the option for newly arriving values to replace values that are already in the object nodes (see Overwrite in Figure 11-8).

Source

OMG Systems Modeling Language (SysML) 1.6

Webel recommends when using MagicDraw/Cameo: AVOID the "elided Pin" abstract ObjectNode notation on Activity Diagrams, use explicit Pins!

MagicDraw/Cameo: DO NOT use the ObjectNode menu item on Activity Diagrams ever!

Figure D.36 - Behavior Model for “Accelerate” Function (Activity Diagram) {EXPLICIT PINS}

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Tutorial

TRAIL: The SysML-1.6 Hybrid SUV sample and specification diagrams in MagicDraw/Cameo (with annotations) [UNDERGOING UPDATE to SysML1.7]

Section

Section: SysML-1.6: HSUV sample

Slide kind

SysML Activity Diagram

The stereotypes on the object nodes between actions in the figure apply to parameters of the behaviors or operations called by the actions (see the notation for object nodes described in 11.3.1.4, ObjectNode, Variables, and Parameters).

Source

OMG Systems Modeling Language (SysML) 1.6

MagicDraw/Cameo: ERROR: Incorrectly uses 2 ObjectFlow edges and a CentralBufferNode in place of "elided Pin notation" instead of an abstract ObjectNode symbol and 2 arrow symbols (that are supposed to represent together 2 Pins and 1 ObjectFlow edge)

Figure D.36 - Behavior Model for “Accelerate” Function (Activity Diagram) {ELIDED PINS}

Gallery

Tutorial

TRAIL: The SysML-1.6 Hybrid SUV sample and specification diagrams in MagicDraw/Cameo (with annotations) [UNDERGOING UPDATE to SysML1.7]

Section

Section: SysML-1.6: HSUV sample

Slide kind

SysML Activity Diagram

two_input_parameters If the DecisionNode has a decisionInputFlow and a second incoming ObjectFlow, then any decisionInput has two in Parameters ...

Source

Unified Modeling Language 2.5.1

decision_input_flow_incoming The decisionInputFlow of a DecisionNode must be an incoming ActivityEdge of the DecisionNode.

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Unified Modeling Language 2.5.1

DecisionNode::edges The ActivityEdges incoming to and outgoing from a DecisionNode, other than the decisionInputFlow (if any), must be either all ObjectFlows or all ControlFlows.

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Unified Modeling Language 2.5.1

The values on such object tokens may be used to affect the control of ExecutableNodes that are the targets of such ControlFlows, though the specific meaning of such values is not defined in this specification

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Semantics of a Foundational Subset for Executable UML Models 1.4

If isControlType=true for an ObjectNode, ControlFlows may be incoming to and outgoing from the ObjectNode, objects tokens can come into or go out of the ObjectNode along ControlFlows, and these tokens can flow along ControlFlows reached downstream ...

Source

Semantics of a Foundational Subset for Executable UML Models 1.4

ObjectNodes may specify an inState set of States

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Slide kind

UML Activity Diagram

UML Class Diagram

UML hybrid diagram

UML StateMachine Diagram

If the upperBound evaluates to *, then there is no limit on the number of tokens the ObjectNode may hold.

Source

Unified Modeling Language 2.5.1

If the removal of one or more tokens brings the number of tokens held below the evaluated upperBound, then the ObjectNode may accept any pending offers up to the limit of the upperBound.

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Unified Modeling Language 2.5.1

If the number of tokens already held by the ObjectNode is greater than or equal to the evaluated upperBound, then the ObjectNode shall not accept any further tokens until some of the ones it is holding are removed.

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Unified Modeling Language 2.5.1

An ObjectNode may not contain more tokens than specified by its upperBound, if any. If an ObjectNode has an upperBound, then this ValueSpecification shall evaluate to an UnlimitedNatural value. The upperBound is evaluated each time a token is offered ...

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Unified Modeling Language 2.5.1

ObjectNodes may also specify an inState set of States. If such a set is specified, then any object token held by the ObjectNode shall have a value with a type that has or inherits a StateMachine as its classifierBehavior that has all of the states ..

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Unified Modeling Language 2.5.1

Null tokens (object tokens without a value) satisfy the type of all object nodes.

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Unified Modeling Language 2.5.1

ObjectNodes are TypedElements ... If an ObjectNode has a type specified, then any object tokens held by the ObjectNode shall have values that conform to the type of the ObjectNode. If no type is specified, then the values may be of any type.

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Unified Modeling Language 2.5.1

An ObjectNode may contain multiple object tokens with the same value. Such tokens are not normally combined (but see the special semantics for DataStoreNodes ...).

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Unified Modeling Language 2.5.1

A token may traverse only one of the outgoing edges.

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Unified Modeling Language 2.5.1

Except in the case of an output ActivityParameterNode, tokens held by an ObjectNode may leave the node on outgoing ActivityEdges.

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Unified Modeling Language 2.5.1

Except in the case of an input ActivityParameterNode ... the tokens held by an ObjectNode arrive from incoming ActivityEdges.

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Unified Modeling Language 2.5.1

15.4.3.1 Object Nodes - An ObjectNode holds object tokens during the course of the execution of an Activity.

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Unified Modeling Language 2.5.1

SysML: Naming: Always use either anonymous or first letter lower case for Property, ObjectNode and InstanceSpecification names; no exceptions (unless using names to "quote text")! Valid: 'lowerCamelCase' OR 'tla' vs TLA acronym OR 'uCC' vs UpperCamelCase

fUML-1.4 EXCLUDES ObjectNode::inState

fUML-1.4 EXCLUDES ObjectNode::upperBound

fUML-1.4 EXCLUDES ObjectNode::transformation and ObjectNode::selection

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