SysML Reference Property representations

Gallery
Tutorial
TRAIL: Webel's ultimate guide to Systems Modeling Language (v1) with MagicDraw/Cameo
Section
08:01: The building Blocks of SysML
Topic level
ESSENTIAL
UML keywords
internal structure compartment
AggregationKind::none
AggregationKind::shared
SysML keywords
Block
reference property
MD:ReferenceProperty
MD:AbstractReferenceProperty
MD:SharedProperty
Slide kind
SysML Block Definition Diagram (BDD)
Click on the image to view it full size
The block RemoteControl can communicate with an Appliance, but it is not strictly part of it (it does not get "destroyed" when the appliance does), so it is represented here as have an Association with reference property appliance:Appliance as an end Property. The Association is non-navigable, because it is assumed that it is an old-school remote control that can send signals to the appliance to control it, but the appliance can't talk back.

For better or worse, both AggregationKind::none and AggregationKind::shared qualify as determining reference properties, as long as the Property is typed by a Block, which can sometimes be confusing, as the notation for them is then the same:

SysML-1.6: 'A property typed by a Block that does not have composite aggregation is classified as a reference property.'
Up next
SysML "shared" Property challenge as objects: two Triangles share one LineSegment edge.
Notes
[CAVEAT, DISPLAY, TOOL]{INFORMATIVE} MagicDraw/Cameo: Does not show the “structure” label at the top of an internal structure compartment.
[NAMING, POLICY]{STRICT} 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
Snippets (quotes/extracts)
  [SysML-1.6] A reference property is shown by a dashed-outline box, consistent with UML.
  [SysML-1.6] Part, reference, value, and constraint properties may be shown in block definition compartments with the labels "parts," "references," "values," and "constraints" respectively.
  [SysML-1.6] A compartment with the label “structure” may appear as part of a block definition to show connectors and other internal structure elements for the block being defined. This compartment may contain any of the graphical elements of an internal block diagram
  [SysML-1.7] A property typed by a Block that does not have composite aggregation is classified as a reference property.
Visit also
Visit also (backlinks)
SysML: Syntax ain't Semantics: FUN CHALLENGE: SysMLv1 block property aggregation: 'The tornado chaser plane "has" a chaser car "with" a chaser team.'
SysMLv1: MagicDraw/Cameo: Oh no, I lost my part or reference property? Where did it go? The Symbol Properties option for 'Show Association ends as Attributes' may help you find it!
SysMLv1: A part Property or reference Property is not necessarily a 'memberEnd' or 'ownedEnd' of an Association ('association' or 'owningAssociation'). But an Association always as at least 2 'memberEnd' Properties. (With some MagicDraw/Cameo tool tips.)
Webel: SysMLv1: Overview of annotated Diagram Slides and Note pages related to general high level SysML modelling principles (some specific to MagicDraw/Cameo). Recommended reading for all Webel SysML/MBSE course attendees.
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'
Related slides (includes other tutorials)
Related slides (backlinks, includes other tutorials)