On 2021-09-22 9:54 am, Maatary Okouya wrote:
Taken from the specification:
>>>
A node shape is a shape <https://www.w3.org/TR/shacl/#dfn-shape> in
the shapes graph <https://www.w3.org/TR/shacl/#dfn-shapes-graph> that
is not the subject <https://www.w3.org/TR/shacl/#dfn-subject> of a
triple <https://www.w3.org/TR/shacl/#dfn-rdf-triple> with *sh:path* as
its predicate <https://www.w3.org/TR/shacl/#dfn-predicate>. SHACL
instances
<https://www.w3.org/TR/shacl/#dfn-shacl-instance> of sh:NodeShape cannot
have a value <https://www.w3.org/TR/shacl/#dfn-value> for the
property sh:path.
>>>
Yet when talking Or Constraint or And Constraint, that takes list of
shapes, we find example like what follow:
>>>>
ex:SuperShape a sh:NodeShape ;
sh:property [ sh:path ex:property ; sh:minCount 1 ; ] .
ex:ExampleAndShape a sh:NodeShape ;
sh:targetNode ex:ValidInstance, ex:InvalidInstance ;
sh:and (
ex:SuperShape
[
sh:path ex:property ;
sh:maxCount 1 ;
] ) .
>>>>
With the following explanation
>>>
The following example illustrates the use of sh:and in a shape to
specify the condition that certain focus nodes have exactly one value
of ex:property. This is achieved via the conjunction of a separate
named shape (ex:SuperShape) which specifies the minimum count, and a
*blank node shape* that additionally specifies the maximum count. As
shown here, sh:and can be used to implement a specialization mechanism
between shapes.
>>>>
How on earth is this a Blank Node shape if it is the subject of an
sh:path, am I missing something ?
It should be a "blank property shape". I have recorded a bug report to
the spec's Errata:
https://github.com/w3c/data-shapes/issues/140
Note the error is in an informative block of text, so it doesn't change
implementations.
Thanks for pointing this out
Holger
```
[
sh:path ex:property ;
sh:maxCount 1 ;
]
```
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