Issue 487: Property Type Updates

[kchason]

Addresses #487

Originally added the xsd:string types to the following properties:

• uco-observable:destinationFlags
  • uco-observable:byteStringValue

A follow-on patch revised the added types to be xsd:hexBinary for destinationFlags (to match sourceFlags), and xsd:base64Binary for byteStringValue (to distinguish from stringValue).

Coordination

• [x] Pull Request is against correct branch
• [x] Pull Request is in, or reverted to, Draft status before Solutions Approval vote has passed.
• [x] CI passes in UCO feature branch
• [x] CI passes in UCO current unstable branch (202d76b)
• [x] CI passes in CASE current unstable branch tracking UCO's unstable as submodule (2769fa8)
• [x] Impact on SHACL validation reviewed for CASE-Examples
• [x] Impact on SHACL validation remediated for CASE-Examples (N/A)
• [x] Impact on SHACL validation reviewed for casework.github.io
• [x] Impact on SHACL validation remediated for casework.github.io (N/A)
• [x] Milestone linked
• [x] Solutions Approval vote logged on corresponding Issue (once logged, can be taken out of Draft PR status)

[ajnelson-nist]

@kchason , FYI - I added a patch to this PR to add missed SHACL datatype constraints, and to use types different from xsd:string. I looked at nearby properties and saw there were more appropriate options than xsd:string. I believe this is still worth a fast-track vote.