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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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Source
OMG Systems Modeling Language (SysML) 1.6
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
Snippet kind
INFO
UML keywords
Property
AggregationKind
Property::aggregation
AggregationKind::composite
SysML keywords
Block
value property
MD:ValueProperty
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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A property typed by a SysML ValueType is classified as a value property, and always has composite aggregation.
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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.
Related snippets
SysML establishes four basic classifications of properties belonging to a SysML Block or ValueType.
A block can include properties to specify its values, parts, and references to other blocks.
Ports are a special class of property used to specify allowable types of interactions between blocks ...
Constraint Properties are a special class of property used to constrain other properties of blocks...
Constraint properties are further defined in Clause 10. A port is another category of property, as further defined in Section 9.
Related snippets (backlinks)
Properties of any type may be shown in a "properties" compartment or in additional compartments with user-defined labels.
Four general categories of properties of blocks are recognized in SysML: parts, references, value properties, and constraint properties.
A part or value property is always shown on an internal block diagram with a solid-outline box.
Block::6_valueproperties_composite: If a property owned by a SysML Block or SysML ValueType is typed by a SysML ValueType, then the aggregation attribute of the property shall be "composite."
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