In SysML, unless you MUST use a DataType or PrimitiveType from an existing ModelLibrary or Profile, you SHOULD probably be using a ValueType, Enumeration ValueType, or SysML PrimitiveValueType instead so that it integrates with the value system of SysML.

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Note kind
TIP
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STRONG
UML keywords
DataType
PrimitiveType
SysMLv1.x keywords
ValueType
PrimitiveValueType
Keywords
Relates to
ExampleBlock in a Block Definition Diagram (BDD)
SysML ValueType and QUDV overview
UML DataType vs SysMLv1 ValueType
Structured vs Primitive DataType
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Related snippets (extracts)
  [SysML-1.6] Although SysML indirectly imports the UML 2 PrimitiveTypes library ... due to the transitivity of package import, SysML provides a PrimitiveValueTypes model library that systems engineers can extend via SysML’s ValueType stereotype.
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