Req 2.7.4 Nested Constraint Macros

Dear all,

the "Nested Constraint Macros" requirement was proposed for approval in the
12.02.15 meeting. The minutes are missing and cannot recall if it was
approved.

After yesterday's wording changes in 2.5.1 "Association of Class with
Shape" I believe that 2.7.4 might bring undesired effects and needs to be
stated in more detail.

The problem I see is that if a shape *can* be associated with a class and
shapes *can* be nested, then 2.7.4 allows (ShEx) NodeShapes to be mixed
with ClassShapes.

In my understanding ClassShapes were meant to be nested using the the 2.5.4
Property Type req and 2.7.4 was meant for NodeShapes mostly. Mixing these
two could possibly work when linking ClassShapes from NodeShapes but not
sure if it can work the other way around. I think we need more details on
how NodeShapes work in order to determine this type of nesting.

Best,
Dimitris

-- 
Dimitris Kontokostas
Department of Computer Science, University of Leipzig
Research Group: http://aksw.org
Homepage:http://aksw.org/DimitrisKontokostas