Check RDF for abstract classes

[zvr]

@JPEWdev has contributed this code to generate RDF regarding abstract classes:

spec-parser/spec_parser/rdf.py

Lines 99 to 111 in 3d1d92e

	if c.metadata["Instantiability"] == "Abstract":
	bnode = BNode()
	g.add((node, SH.property, bnode))
	g.add((bnode, SH.path, RDF.type))
	notNode = BNode()
	g.add((bnode, SH["not"], notNode))
	hasValueNode = BNode()
	g.add((notNode, SH["hasValue"], node))
	msg = Literal(
	f"{node} is an abstract class and should not be instantiated directly. Instantiate a subclass instead.",
	lang="en",
	)
	g.add((bnode, SH.message, msg))

Can we re-check it, please?
I do not like that line 105 creates hasValueNode which is never used...

Don't submit a PR, let's simply discuss what needs to be changed and I'll integrate it to the large set of changes I have ready to merge...

[JPEWdev]

I'm pretty sure line 105 is extraneous and can be removed

[zvr]

Thanks, Joshua.
So, the currently generated SHACL is correct, we were simply creating an extra blank node that was never used.