UAF13 — 'View Specification' Is Not Defined and Seems Indistinguishable in use from 'Architecture Viewpoint'

No where in the document is 'view specification' defined despite it being used in 7.2 and as a package name in the metamodel.

In ISO 42010:2011 an 'Architecture Viewpoint' is defined as 'work product establishing the conventions for the construction, interpretation and use of architecture views to frame specific system concerns' and in the ISO 42010 conceptual model is has a 'governs' relationship with Architecture View i.e. an Architecture Viewpoint is a specification containing a set of requirements against which an Architecture View is prepared and interpreted. How then is 'View Specification' different? This is particularly the case as 'View Specification' seems not to merit a UAF metamodel element.