[data-shapes] Pull Request: #246: Create SHACL OWL concept-casting resource

ajnelson-nist has just submitted a new pull request for https://github.com/w3c/data-shapes:

== #246: Create SHACL OWL concept-casting resource ==
This PR will close #246 .

Items remaining to move out of Draft status:

- [ ] Find spot among SHACL documents to note graph file.
- [ ] Confirm placeholder `owl:versionIRI` OK.

See https://github.com/w3c/data-shapes/pull/336


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