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
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Unified Modeling Language 2.5.1
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
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Property
Property::defaultValue
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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 value.
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The evaluated default then becomes the initial value (or values) of the Property.
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The evaluated default then becomes the initial value (or values) of the Property.
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.
Property::defaultValue : ValueSpecification [0..1] Specifies a ValueSpecification that represents a value to be used when no argument is supplied for the Parameter.
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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