Property

Cameo Simulation Toolkit: v19SP3: GOTCHA/BUG: When a Property is typed by an abstract Block an instance of a concrete specialising Block (where available) will automatically be created and assigned even when the lower multiplicity is 0

Webel: SysMLv1: Dr Darren for LinkedIn: On "Trusting The Type" and avoiding unnecessary verbose repetitive Property names ... unless you really, really need them and really do have reasons to use them, and then only use concise role indicators anyway!

SysML Parametrics: You can use custom stereotypes keywords «i» and «o» on constraint parameters to indicate their intended use (causality) as (i)nputs and (o)utputs on ConstraintBlocks

Webel: WISHLIST: MagicDraw/Cameo: UML/SysML: Ability to freeze the Feature lines shown on symbols under Edit Compartments so that the diagram does not "break" when new Features are added elsewhere (reduce graphical coupling)

Screencast: Cameo Simulation Toolkit: v19SP3: Analysis: When a Property is typed by an abstract Block an instance of a concrete specialising Block will automatically be created and assigned even when the lower multiplicity is 0

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This screencast video is an analysis of this suspected issue:

It also includes a nice demo of using an Activity and Actions to simulate instance creation and assignment in Magic Model Analyst^® (Cameo Simu

Read more about Screencast: Cameo Simulation Toolkit: v19SP3: Analysis: When a Property is typed by an abstract Block an instance of a concrete specialising Block will automatically be created and assigned even when the lower multiplicity is 0

Cameo Simulation Toolkit: v19SP3: GOTCHA/BUG: When a Property is typed by an abstract Block an instance of a concrete specialising Block (where available) will automatically be created and assigned even when the lower multiplicity is 0

UML/SysML: MagicDraw/Cameo: 19SP3: Instance Table Diagram sometimes does not display the values for nested value properties

A ValueSpecification is the specification of a (possibly empty) set of values. A ValueSpecification is a ParameterableElement that may be exposed as a formal TemplateParameter and provided as the actual parameter in the binding of a template.

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Property::defaultValue : ValueSpecification [0..1] Specifies a ValueSpecification that represents a value to be used when no argument is supplied for the Parameter.

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If a Property has a specified default, and the Property redefines another Property with a specified default, then the redefining Property’s default is used in place of the more general default from the redefined Property.

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The evaluated default then becomes the initial value (or values) of the Property.

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If there is a defaultValue specified for a Property, this default is evaluated when an instance of the Property is created in the absence of a specific setting for the Property or a constraint in the model that requires the Property to have a specific val

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MagicDraw/Cameo: 19SP3: Although a 0..* or 1..* Property can carry more than one value, the interface only permits assignment of a single Property::defaultValue through the specification dialog

UML/SysML: MagicDraw/Cameo: WARNING: If you assign a value to a Slot for an untyped Property then assign a ValueType later it will DELETE your assigned value! Assign a type first .

For some kinds of Classifiers, optionally in the right hand corner an icon denoting the kind of Classifier can be displayed.

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If a role is typed by a classifier other than Class, the name compartment of the part box symbol contains the appropriate keyword (e.g., «component») above the name.

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TRAIL: SysPhS-1.1 Annex A examples in MagicDraw/Cameo SysML vs Modelica (Wolfram SystemsModeler)

UML/SysML: In Internal Block Diagrams: If you have a Port with a name that indicates a unique role AND and if there is an ItemFlow on a Connector that implies or suggests the Type of the Port, consider hiding the Type on the Port symbol.

GOTCHA: MagicDraw SysML/Cameo 19SP3: Export to Modelica: The name of a redefining Property must be exactly the same as the Property it redefines or it will not export properly!

A.5 Humidifier: Value property defaults table

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Annex A.5: Humidifier (with Units)

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MagicDraw/Cameo: table

SysML/SysPhS-1.1: Anonymous Property or Action names may not be an option if: You are exporting to Modelica or Simulink; You absolutely need names for generated query reports (such as generated Interface Control Documents).

A.5 Humidifier: Scenario block overview BDDs: 96 to 102

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TRAIL: SysPhS-1.1 Annex A examples in MagicDraw/Cameo SysML vs Modelica (Wolfram SystemsModeler)

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Annex A.5: Humidifier (with Units)

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SysML Package Diagram

MagicDraw/Cameo: HOWTO: Create a redefining value property with a default value using drag-n-drop

MagicDraw/Cameo: On dragging a Property onto another Property set it as redefining, the multiplicity of the redefining Property is set to [0..*] if the redefined (dragged) Property only has <UNSPECIFED> Multiplicity

WISHLIST: MagicDraw/Cameo: Ability to set project-wide option to NOT set the multiplicity of a redefining Property to [0..*] on using drag-n-drop when the redefined (dragged) Property has <UNSPECIFED> Multiplicity

MagicDraw/Cameo: v19SP3: Property created by dragging onto a Class or Block a symbol of a Classifier named with a single letter capital name 'N' has a poor name 'N:N'

MagicDraw/Cameo: You can drag a Class symbol onto a Class symbol (in a Class Diagram) or a Block symbol or ValueType symbol onto or Block symbol (in a Block Definition Diagram) to create a new part property or value property

MagicDraw/Cameo: You can drag out a Property (or Port) from a Class or Block symbol to create an Association with the Property (or Port) as one end

MagicDraw/SysML vs SysPhS-1.1: Can't reproduce the "shortcut" property path representation of some properties nested within Ports as shortcut symbols fully inside the diagram frame. (Might be a specification diagram style issue.)

Figure 47 shows an initial value for source amplitude amp, while Figure 48 shows initial values for amplifier signal gain g and filtering properties xi and alpha ...

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SysPhS-1.1

SysML initial values specify property values for components used in internal block diagrams.

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SysPhS-1.1

Figure 27: Default values and initial value in SysML

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TRAIL: SysPhS-1.1 specification body figures in MagicDraw/Cameo SysML vs Modelica [using Wolfram SystemsModeler]

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TRAIL: SysPhS-1.1 specification body figures in MagicDraw/Cameo SysML vs Modelica [using Wolfram SystemsModeler]

SysML Parametric Diagram

Figure 18, 19, 20: Block, Part, Generalization, Redefinition.

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TRAIL: SysPhS-1.1 specification body figures in MagicDraw/Cameo SysML vs Modelica [using Wolfram SystemsModeler]

Figure 1: Simulation stereotypes

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UML Profile Diagram

UML/SysML: When you use an AddStructuralFeatureValueAction to set one end of a bi-directional Association it also sets the other end.

Webel Twin Pattern: Convention: [MIGHT CHANGE]: A '*' prefix in a Property name of a «digital» @Block in a DigitalTwin model indicates a mapped block property, which must be typed by a non-digital «mappable» Block, and must have the «@» keyword applied.

Cameo Simulation Toolkit: GOTCHA: In the Variable pane reference properties are hidden by default (show them using the Options pulldown menu)

Screencast: UML/SysML: HOWTO Consume a SignalEvent message in a StateMachine Transition 'effect' or State 'entry' or 'exit' Activity

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Consume a SignalEvent message in a StateMachine Transition 'effect' or State 'entry' or 'exit' Activity

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UML/SysML: HOWTO Consume a SignalEvent message in a StateMachine Transition 'effect' or State 'entry' or 'exit' Activity

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UML Activity Diagram

Consume a SignalEvent message in a StateMachine Transition 'effect' or State 'entry' or 'exit' Activity

UML StateMachine Diagram

UML/SysML: HOWTO Consume a SignalEvent message in a StateMachine Transition 'effect' or State 'entry' or 'exit' Activity

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SysML Parametrics: You can use custom stereotypes keywords «i» and «o» to indicate value properties that are intended to be used as (i)nputs and (o)utputs when bound to constraint parameters for SysML Parametrics

Internal Structure Compartment vs Composite Structure Diagram

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

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01:02: UML 101 for model-based systems engineering with SysML

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UML Composite Structure Diagram

Association and Property - some cases

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

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01:02: UML 101 for model-based systems engineering with SysML

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

Inherited Feature indicator

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01:02: UML 101 for model-based systems engineering with SysML

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

Generalization and VisibilityKind example

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01:02: UML 101 for model-based systems engineering with SysML

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

Class compartments

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Tutorial

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01:02: UML 101 for model-based systems engineering with SysML

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

MagicDraw/Cameo: The ordering of feature in a SysML IBD :features compartment may differ from that in its defining Block (and there are no corresponding display options for controlling sorting).

MagicDraw/Cameo: BUG: Sometimes the 'Show Inherited' display feature does not work immediately on Class and Block compartments or SysML IBD :features compartments unless you toggle a compartment (close then re-open it).

Instances with part-carrying Slots

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08:02: The SysML ValueType, Unit, and using values

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

Associative BDD view

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08:01: The building Blocks of SysML

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MagicDraw/Cameo: If you want to show a Property or Port listed both in its corresponding compartment on a Class or Block symbol and as the end of an Association in the same diagram, set the display option Show Association Ends As Attributes/Ports to 'all'

If a Property has a specified default, and the Property redefines another Property with a specified default, then the redefining Property’s default is used in place of the more general default from the redefined Property.

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A derived Property may redefine one which is not derived. An implementation shall ensure that the constraints implied by the derivation are maintained if the Property is updated.

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Property is indirectly a kind of RedefinableElement, so Properties may be redefined. The name and visibility of a Property are not required to match those of any Property it redefines.

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MagicDraw/Cameo: You can set a Property as redefined/subsetted by another in a Class Diagram or BDD by dragging its label from an Association end onto the label of another Property on an Association end then choosing 'Set As Redefined/Subsetted Property'

MagicDraw/Cameo: Has a symbol display option 'Show Inherited' applicable to (amongst others) Features of Class and Block symbols, Property symbols, and underlying Featured of Property symbols in SysML IBDs when using SysML Feature Compartments

Use singular Property names, let the multiplicity indicate plurality.

Constraint properties and their parameters also have their own notations ...

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Ports are special cases of properties, and have a variety of notations ...

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A reference property is shown by a dashed-outline box, consistent with UML.

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A part or value property is always shown on an internal block diagram with a solid-outline box.

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Four general categories of properties of blocks are recognized in SysML: parts, references, value properties, and constraint properties.

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Properties of any type may be shown in a "properties" compartment or in additional compartments with user-defined labels.

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Part, reference, value, and constraint properties may be shown in block definition compartments with the labels "parts," "references," "values," and "constraints" respectively.

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A property typed by a SysML ValueType is classified as a value property, and always has composite aggregation.

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A property typed by a SysML Block that has composite aggregation is classified as a part property, except for the special case of a constraint property ...

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OMG Systems Modeling Language (SysML) 1.7beta1

A property typed by a Block that does not have composite aggregation is classified as a reference property.

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Constraint properties are further defined in Clause 10. A port is another category of property, as further defined in Section 9.

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SysML establishes four basic classifications of properties belonging to a SysML Block or ValueType.

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SysML also allows each usage to define context-specific values and constraints associated with the individual usage, such as 25 psi for the front tires and 30 psi for the rear tires.

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For example, a block that represents the definition of a wheel can be used in different ways. The front wheel and rear wheel can represent different usages of the same wheel definition.

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A part belonging to a block, for example, may be typed by another block. The part defines a local usage of its defining block within the specific context to which the part belongs.

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A property can represent a role or usage in the context of its enclosing block. A property has a type that supplies its definition.

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Various notations for properties are available to distinguish these specialized kinds of properties on an internal block diagram.

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Constraint Properties are a special class of property used to constrain other properties of blocks...

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Ports are a special class of property used to specify allowable types of interactions between blocks ...

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A block can include properties to specify its values, parts, and references to other blocks.

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The Internal Block Diagram in SysML captures the internal structure of a block in terms of properties and connectors between properties.

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It captures the definition of blocks in terms of properties and operations, and relationships such as a system hierarchy or a system classification tree

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Parts in these systems may interact by many different means, such as software operations, discrete state transitions, flows of inputs and outputs, or continuous interactions.

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The specific kinds of components, the kinds of connections between them, and the way these elements combine to define the total system can all be selected according to the goals of a particular system model.

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Blocks provide a general-purpose capability to model systems as trees of modular components.

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Each block defines a collection of features to describe a system or other element of interest. These may include both structural and behavioral features, such as properties and operations, to represent the state of the system and behavior ...

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MagicDraw/Cameo: In SysML Activity Diagrams you can only set the allocation mode in to 'usage' or 'definition' for an entire AllocateActivityPartition group at once, not for individual AllocateActivityPartition columns or rows.

All ports and nested ports (i.e., proxy, full, and ports with no stereotype applied), and their type definitions (e.g., interface blocks, blocks) can include compartments with textual and graphical representations to display their features ...

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Ports are specialized kinds of properties, and can be shown in same way as other properties. They can appear in block compartments in the same format as other properties of their owning blocks, or as the ends of associations, with the port appearing ...

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"Trust the Port or Pin Type!" - Often the name of the Type of an anonymous Port or Pin is completely sufficient to indicate its role, unless a clear indication of its direction or unique role is required.

UML/SysML: In Internal Block Diagrams: Consider hiding the name of a named Port or Property in a Diagram if its Type is sufficient to indicate its role.

For example, a block might provide particular services to other blocks as operations, or have a particular geometry accessible to other block, or it might require services and geometries of other blocks.

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Required and provided features are operations, receptions, and non-flow properties that a block supports for other blocks to use, or requires other blocks to support for its own use, or both.

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Directed features can appear in compartments for the various kinds of properties and behavioral features.

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Provided non-flow properties are read and written on the owning block, while required non-flow properties are read or written on an external block

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Using non-flow properties means to read or write them, and using behavioral features means to invoke them.

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Then it is delivered to a factory, reclassified from a warehouse item to a factory resource (while still being a machine), and records the percentage of time it is operating.

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At first it is not an item or resource and is classified only as a machine. Before delivery to the factory, a new machine is stored in a warehouse, classified additionally as a warehouse item, and is assigned a storage location.

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Figure 8-23 shows the classification of a particular machine over time, identified by its serial number.

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The properties disappear once an item leaves a warehouse or a resource is no longer used in a factory, because they are declassified as WarehouseItems and FactoryResources at that time, respectively.

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The properties appear when an item arrives in a warehouse or a resource is used in a factory, because they are classified as WarehouseItems and FactoryResources at that time, respectively

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Items in warehouses are assigned a location, while resources in factories indicate own much they are being used as a percentage of time. Only objects that are items in warehouses or resources in factories have these location and utilization properties.

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Figure 8-22 shows property-specific types in a model of facilities that includes factories and warehouses. Items flow through facilities, while resources operate on items.

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The PropertySpecificType stereotype can be applied to classifiers that type exactly one property and that are owned by the owner of that property. Classifiers with this stereotype applied shall be generalized by at most one other classifier.

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

MagicDraw/Cameo: By implementation the name of some Stereotype attributes and operations is UpperCase instead of lowerCase like in the UML and SysML specs

Figure 15-4: Behavior Allocation

This content has been marked as discussing an ADVANCED topic!

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Section: SysML-1.6 specification diagrams: 15 Allocations

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SysML Activity Diagram

Properties with AdjunctProperty applied, where the principal of the AdjunctProperty is an interaction use, can be used as the end of the associations towards the interaction being used.

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Properties with AdjunctProperty applied, where the principal of the AdjunctProperties are call actions, including call behavior actions, can be used as the part end of the associations. See 8.3.2.2 for constraints when AdjunctProperty is used ...

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

Figure 8-9: Abstract syntax extensions for SysML adjunct properties and classifier behavior properties

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Section: SysML-1.6 specification diagrams: 08 Blocks

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UML Profile Diagram

Figure 8-3: Abstract syntax extensions for SysML properties

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

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Section: SysML-1.6 specification diagrams: 08 Blocks

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UML Profile Diagram

MagicDraw/Cameo: Does not seem to support showing a trailing colon ':' in labels of Properties or Connectors that are untyped OR are typed by anonymous Classes, Blocks, or Associations. (The notation is used in some SysML specification diagrams.)

Figure D.34 - Defining Straight-Line Vehicle Dynamics Mathematical Constraints (Definition of Dynamics)

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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]

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Section: SysML-1.6: HSUV sample

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Avoid punctuation in Property names (except when used to "quote text"). You can usually avoid underscores in Property names (even if they are used in the Type name) if you can "Trust the Type"!

Since overall fuel economy is a key requirement on the HSUV design, this example applies significant detail in assessing it. Figure D.32 shows the constraint blocks and properties necessary to evaluate fuel economy.

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MagicDraw/Cameo 19SP3: Does not seem to directly support compartment for decomposition of Views as properties of Views (but one can create properties in an IBD and they will show in the 'attributes compartment')

It is sometimes desirable to construct views from other views, and to establish an order for presenting the views. Views may include one or more views as properties, each of which conforms to their viewpoint. The order of the referenced views is ...

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It is expected that an «allocate» relationship between model elements is a precursor to a more concrete relationship between the elements, their properties, operations, attributes, or sub-classes.

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A parametric diagram is a restricted form of internal block diagram that shows only the use of constraint blocks along with the properties they constrain within a context.

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MagicDraw/Cameo: HOWTO Create a nested Property "shortcut" symbol with a dot property path in a Parametric Diagram or Internal Block Diagram

If the property has no name, the property’s type name can be used instead. e.g., car:Engine:Cylinder:Piston.length car.e.c.p.length

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In other words, the internal property shown with a path name in the left-hand side of Figure 8-1 is equivalent to the innermost nested box shown at the right.

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This notation is purely a notational shorthand for a property that could otherwise be shown within a structure of nested property boxes, with the names in the dotted string taken from the name that would appear at each level of nesting

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If any of the properties named in the path name string identifies a reference property, the property box is shown with a dashed-outline box, just as for any reference property on an internal block diagram.

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A colon and the type name for the property may optionally be shown following the dotted name string.

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The name of the referenced property is built by a string of names separated by “.”, resulting in a form of path name that identifies the property in its local context.

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A property name shown inside or outside the property box may take the form of a multi-level name. This form of name references a nested property accessible through a sequence of intermediate properties from a referencing context.

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A constraint property may be shown on a parametric diagram using a rectangle with rounded corners. This graphical shape distinguishes a constraint property from all other properties and avoids the need to show an explicit «constraint» keyword. Otherwise..

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All properties that appear, other than the constraints themselves, shall either be bound directly to a constraint parameter, or contain a property that is bound to one (through any number of levels of containment).

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A parametric diagram is defined as a restricted form of internal block diagram. A parametric diagram may contain constraint properties and their parameters, along with other properties from within the internal block context.

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As with any connector owned by a SysML Block, the ends of a binding connector may be nested within a multi-level path of properties accessible from the owning block. The NestedConnectorEnd stereotype is used to represent such nested ends just as for ...

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If the properties at the ends of a binding connector are typed by a Block, the connector specifies that the instances of the properties shall refer to the same block instance.

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If the properties at the ends of a binding connector are typed by a ValueType, the connector specifies that the instances of the properties shall hold equal values, recursively through any nested properties within the connected properties.

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A FlowProperty signifies a single flow element to/from a block. A flow property has the same notation as a Property only with a direction prefix (in | out | inout). Flow properties are listed in a compartment labeled flow properties.

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For example, the ICE block specifies the provided operations setMixture and setThrottle, the provided properties RPM, temperature, and isKnocking, and required property isControlOn, as shown in Figure D.20. This block types the ctrl port of ...

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MagicDraw/Cameo 19SP3: Does not yet handle Feature-wise validation of provided/required DirectedFeature contracts (it only handles them at the level of entire Block types). Webel asserts the spec is inconsistent w.r.t. ProxyPort connection compatibility.

SysMLv1.6 Provided/required DirectedFeature contracts for ProxyPorts SHOULD be satisfiable Feature-wise (including as subsets of Features) not necessarily just at the level of entire Blocks (types)! [See also the SysMLv1.7 spec changes.]

DO NOT use spaces in Property names or Class/Block names! If you want to communicate familiar names of elements within an organisation use a custom stereotype and tagged values (such as 'aka')!

In MagicDraw/Cameo an assigned stereotype of a Classifier that types an instance-like element (such as a part Property) "shines through" unless it has an instance-level stereotype assigned. This is sometimes called a "secondary stereotype".

In MagicDraw/Cameo if the Type of a Property has a Composite Structure Diagram or Internal Block Diagram defined it will act as the default hyperlink target for the Property

In MagicDraw/Cameo one can just drag the IBD or BDD of a Block from the model browser onto parts that are typed by that Block to make them the default hyperlink target for that part (so one can just "open the parts up" recursively to navigate the system).

Like UML, SysML defines no specific semantics or constraints for properties with shared aggregation, but particular models or tools may interpret them in specific ways.

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SysML also supports properties with shared aggregation, as shown by a white diamond symbol on an association.

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

Figure D.4 - Establishing the Context of the Hybrid SUV System using a User-Defined Context Diagram

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Section: SysML-1.6: HSUV sample

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SysML Internal Block Diagram (IBD)

SysML: Webel: "Trust the Type!" - Often the name of the Type of an anonymous Property or instance-level element is completely sufficient to indicate its role - unless multiple Properties of the same Type have different roles within the same owner context!

Property::subsettedProperty : Property [0..*] ... The properties of which this Property is constrained to be a subset, if any.

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Then that set shall be included in (or the same as) a set calculated by eliminating duplicates from the collection of values denoted by the subsettedProperty in the same context.

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A Property may be marked as the subset of another subsettedProperty. In this case, calculate a set by eliminating duplicates from the collection of values denoted by the subsetting property in some context.

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A Property may be marked as being a derived union, by setting isDerivedUnion to true. This means that the collection of values denoted by the Property in some context is derived by being the strict union of all of the values denoted ...

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Property::isDerivedUnion : Boolean [1..1] = false Specifies whether the property is derived as the union of all of the Properties that are constrained to subset it.

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A SysML ValueType may define its own properties and/or operations, just as for a UML DataType.

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Value types may be used to type properties, operation parameters, or potentially other elements within SysML.

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