shapes-ISSUE-165 (shapes and scopes introduction): [EDITORIAL] The introduction of shapes and scopes has confused a reader [SHACL Spec]

shapes-ISSUE-165 (shapes and scopes introduction): [EDITORIAL] The introduction of shapes and scopes has confused a reader [SHACL Spec]

http://www.w3.org/2014/data-shapes/track/issues/165

Raised by: Peter Patel-Schneider
On product: SHACL Spec

The beginning of Section 2 has confused an external reviewer.

>From https://lists.w3.org/Archives/Public/public-rdf-shapes/2016May/0000.html

> 2. Shapes
> 
>   The first paragraph says:
> 
>     "Shape scopes define the selection criteria"
> 
>   but then Figure 1 says:
> 
>     "Scope selects focus nodes"
> 
>   If a shape is just a graph (or part of a shapes graph), then surely that
>   graph cannot actually perform a action, like "selects", as if executed like a
>   Java method.  Figure 1 also talks about filter shapes that "refine" or
>   "eliminate" and constraints that "produce".  Talking about graphs as agents
>   is deeply confusing.
> 
>     "Class-based scopes define the scope as the set of all instances of a
>     class."
> 
>   Okay, yes... classes have extensions... after all, RDF Schema 1.1 says that
>   "Associated with each class is a set, called the class extension of the
>   class, which is the set of the instances of the class" [3].  But what does
>   this have to do with defining the set of focus nodes for a shape?  The scope
>   of a shape is _not_ a specific data graph but the set of all instances of a
>   class in the world?

Received on Thursday, 19 May 2016 20:47:28 UTC