Viewpoints are specialized communication to stakeholders that explicitly address a concern. Keep in mind that any associated requirements may not be satisfied by the architecture. The view is not a demonstration that the stakeholder should be happy; rather it is a demonstration of how the architecture addresses the concern.
31.1 Basic Concepts
An "architecture viewpoint" is a specification of the conventions for a particular kind of architecture view. It can also be called the definition or schema for that kind of architecture view. It establishes the conventions for constructing, interpreting, and using an architecture view to address a specific concern (or set of concerns) about a system-of-interest.
An architecture viewpoint references one or more model kinds; an architecture view incorporates one or more models.
Architecture viewpoints are generic, and can be stored in libraries for re-use; an architecture view is always specific to the architecture for which it is created
https://pubs.opengroup.org/architecture/togaf9-doc/arch/chap31.html
A view is what you see.
A viewpoint is where you are looking from, the vantage point or perspective that determines what you see.
Every view has an associated viewpoint that describes it, at least implicitly.
Viewpoints are generic, and can be stored in libraries for reuse. A view is always specific to the architecture for which it is created.
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