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The subject of a viewpoint definition or usage must be a view. Otherwise, a viewpoint is specified with assumed and required constraints, just like any requirement definition or usage.

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42. Views: Viewpoint Example.sysml
SysML2.0: INCONSISTENCY: Multiple SysMLv2 spec and Annex examples and SysMLv2 PILOT GitHub samples have a «viewpoint» or «viewpoint def» with a subject that is not a «view» (or no declared subject)
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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 subject of a viewpoint definition or usage must be a view. Otherwise, a viewpoint is specified with assumed and required constraints, just like any requirement definition or usage.
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However, it is typical for a viewpoint definition to be structured as framing a set of stakeholder concerns ... regarding information about a modeled system or domain of interest.
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A viewpoint definition is a kind of requirement definition ... that frames the concerns of one or more stakeholders regarding information about a modeled system or domain of interest.
The subject of a viewpoint is a view that is required to address the stakeholder concerns.
A viewpoint usage is a requirement usage that is a usage of a viewpoint definition.
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The viewpoint then models the requirement for view needed in order to address the framed concerns.
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