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The declaration of a root namespace is implicit and no identification of it is provided in the SysML notation. Instead, the content of a root namespace is given simply by the list of its top-level elements.

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SysMLv2: Cameo: CAUTION: The "name" displayed for root namespaces on nodes in the model containment browser is just GENERATED from one or more named members within that root namespace. A root namespace does NOT have a name in the underlying SysMLv2 model!
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OMG Systems Modeling Language TM (SysML®) Version 2.0 formal/2025-09-03 (Sep 2025)
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
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The declaration of a root namespace is implicit and no identification of it is provided in the SysML notation. Instead, the content of a root namespace is given simply by the list of its top-level elements.
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For the purposes of model interchange ... a single project may contain one or more root namespace, though there is no syntax for defining a project in the SysML syntax.
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A root namespace is a namespace that has no owner. The owned members of a root namespace are known as top-level elements.
Any element that is not a root namespace has an owner and, therefore, must be in the ownership tree of a top-level element of some root namespace.
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While a root namespace has no explicit owner, it is considered to be within the scope of a single global namespace.
This global namespace may contain several root namespaces (such as those being managed as a project), and always contains at least all of the KerML and SysML model libraries ...
Any root namespace within the global namespace may refer to the name of a top-level element of any other root namespace using an unqualified name (since root namespaces are themselves never named).
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