This is my first dip into SHACL constraints, and what I'm needing might be
easy to do, only I'm stuck at the last step...

My objective is to constrain swa:URIResourceEditor to only offer
auto-complete on an rdf:type with classes in the schema.org namespace,
which is exactly what the comment on the URIResourceEditor says it can do:

The auto-complete can apply a model-driven filter to the resources. If the
> subject has SHACL property constraints for the given predicate, then it
> will filter out all nodes where one of the shapes specified via sh:not is
> not fulfilled. Among others, this makes it possible to filter out system
> namespaces (via tosh:SystemNamespaceShape)
>

Since I want this to apply to all schema.org subjects, I set out to add the
sh:property constraint to schema:Thing only rather than the
tosh:SystemNamespaceShape it seemed more appropriate to use the
dash:StemConstraintComponent and this is where it stopped:  in the list of
constraint shapes I find dash:StemConstraintComponent-stem (which would be
the value of the IRI stem?) but no where to set the value of that stem.

Am I going in the right direction with this? Do I need to define my own
value shape somewhere that would define itself in terms of calling
dash:StemConstraintComponent with the -stem parameter?

Or should I define a new value shape, much like tosh:SystemNamespaceShape
and using sparql to just test that the object starts-with the right
namespace?

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