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SysML defines ValueType as a stereotype of UML DataType to establish a more neutral term for system values that may never be given a concrete data representation.

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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
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INFO
UML keywords
DataType
SysML keywords
ValueType
Value types may be used to type properties, operation parameters, or potentially other elements within SysML.
Full quote
SysML defines ValueType as a stereotype of UML DataType to establish a more neutral term for system values that may never be given a concrete data representation.
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For example, the SysML "Real" ValueType expresses the mathematical concept of a real number, but does not impose any restrictions on the precision or scale of a fixed or floating-point representation that expresses this concept.
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A ValueType defines types of values that may be used to express information about a system, but cannot be identified as the target of any reference.
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Data types in SysML are called value types.
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