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

Icon class
icon_class
far fa-sticky-note
icon_class_computed
far fa-sticky-note
Note kind
CAPABILITY
FEATURE
TIP
TOOL
Policy level
INFORMATIVE
Specification keywords
SysML-1.6
SysML-1.7
UML-2.5.1
UML keywords
Property
Class
Class Diagram
attributes compartment
AggregationKind
AggregationKind::composite
ActivityPartition
receptions compartment
Signal
symbol
SysMLv1.x keywords
Block
block property
SysML Block Definition Diagram
part property
parts compartment
values compartment
ValueType
value property
Keywords
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This is typically one of the first "modelling power tips" new tool users learn. It works for many classifier types: Class, Block, ValueType, Signal etc. Note that:

- A dragged-on Class or Block will usually create a Property with AggregationKind 'composite' (so it will be considered a 'part').

Unfortunately, at least for MagicDraw/Cameo v19SP3, if the "dragged" Class or Block had a name that was a single letter, the automatically generated name in the tool for the newly created Property (such as B:B in the left of the image) does not meet Webel Best Practice:
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'
Webel Best Practice: 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
Luckily, the newly created Property will already be selected as a row in the block compartment, so you can easily rename it. In the case shown you might rename it to from B:B to b:B.

The problem only seems to happen when the Classifier has a single letter name, otherwise you get something like block:Block or thatBlock:ThatBlock (with UpperCamelCase, a.k.a. PascalCase).

GOTCHA: If you for some reason can't see the new Property in a compartment on your Class or Block, it may be because under the symbol properties the relevant compartment has suppress selected, so check that first.

- If you drag a Class onto a Class it should appear in the attributes compartment.

- If you drag a Block onto a Block it should appear in the parts compartment.

- If you drag a ValueType onto a Block it should appear in the values compartment.

- If you drag a Signal onto a Class or Block it should appear in the receptions compartment.

If you still can't see the new Property, it may be that you need to adjust this display setting:

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'

This "drag-on" feature in a sense works together with this "drag-out" feature:

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
Relates to
Related notes
[TOOL] In MagicDraw SysML or Cameo Systems Modeler if you drag a Classifier onto an Association or Connector, it will in fact create a SysML ItemFlow not a UML InformationFlow
[DISPLAY, FEATURE, TOOL]{INFORMATIVE} 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'
[ISSUE, NAMING, TOOL] 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'
[CAPABILITY, FEATURE, TIP, TOOL]{INFORMATIVE} 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
[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
[NAMING, POLICY]{STRONG} Use 'UpperCamelCase' (a.k.a. PascalCase) names for Classifiers such as UML Classes and SysML Blocks) to avoid confusion with 'lowerCase' Property names [see however special naming conventions for acronyms and SysML contract and flow Blocks]
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