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If a StructuralFeature is marked with isReadOnly true, then it may not be updated once it has been assigned an initial value.

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Source
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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SEMANTIC
UML keywords
StructuralFeature::isReadonly
StructuralFeature
The insertion point is ignored if it is used when isReplaceAll=true.
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If a StructuralFeature is marked with isReadOnly true, then it may not be updated once it has been assigned an initial value.
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16.8.3.3 Add Structural Feature Value Actions: An AddStructuralFeatureValueAction is a StructuralFeatureAction for adding a value to a StructuralFeature of an object.
The semantics are undefined for adding a value that violates the upper multiplicity of the StructuralFeature, and for adding a new value to a StructuralFeature with isReadonly=true after initialization of the object that would have the value.
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